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<p class=MsoNormal><a href="index.html">Click here to
go to the applet.</a> <o:p></o:p></p>
<p><a href="http://www.memphis.edu/et/publications/index.php">Click here for a more complete manual.</a></p>
<p>This java applet is an electronic circuit simulator.<span
style='mso-spacerun:yes'>  </span>When the applet starts up you will see a
simple LRC circuit.<span style='mso-spacerun:yes'>  </span>The green color
indicates positive voltage.<span style='mso-spacerun:yes'>  </span>The gray
color indicates ground.<span style='mso-spacerun:yes'>  </span>A red color
indicates negative voltage.<span style='mso-spacerun:yes'>  </span>The moving
yellow dots indicate current.<o:p></o:p></p>
<p>To turn a switch on or off, just click on it.<span
style='mso-spacerun:yes'>  </span>If you move the mouse over any component of
the circuit, you will see a short description of that component and its current
state in the lower right corner of the window.<span style='mso-spacerun:yes'> 
</span>To modify a component (say, to change the resistance of one of the
resistors), move the mouse over it, click the right mouse button (or
control-click, if you have a Mac) and select “Edit”.<o:p></o:p></p>
<p>There are three graphs at the bottom of the window; these act like
oscilloscopes, each one showing the voltage and current across a particular
component.<span style='mso-spacerun:yes'>  </span>Voltage is shown in green,
and current is shown in yellow.<span style='mso-spacerun:yes'>  </span>The
current may not be visible if the voltage graph is on top of it.<span
style='mso-spacerun:yes'>  </span>The peak value of the voltage in the scope
window is also shown.<span style='mso-spacerun:yes'>  </span>Move the mouse
over one of the scope views, and the component it is graphing will be
highlighted.<span style='mso-spacerun:yes'>  </span>To modify or remove a
scope, click the right mouse button over it.<span style='mso-spacerun:yes'> 
</span>To view a component in the scope, click the right mouse button over the
component and select “View in Scope”.<o:p></o:p></p>
<p>If the simulation is moving too slowly or too quickly, you can adjust the
speed with the “Simulation Speed” slider.<o:p></o:p></p>
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<p>The <b>File </b>menu allows you to load or save circuit description
files.<span style='mso-spacerun:yes'>  </span>You can also export a circuit description
as a link so you can share a circuit with others; this link can be optionally
shortened, which is usually better.<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>The
<b>Reset </b>button resets the circuit to a reasonable state.<span
style='mso-spacerun:yes'>  </span>The <b>Run/Stop </b>button allows you to stop
the simulation.<span style='mso-spacerun:yes'>  </span>The <b>Simulation Speed</b>
slider allows you to adjust the speed of the simulation.<span
style='mso-spacerun:yes'>  </span>If the simulation isnt time-dependent (that
is, if there are no capacitors, inductors, or time-dependent voltage sources),
then this wont have any effect.<span style='mso-spacerun:yes'>  </span>The <b>Current
Speed</b> slider lets you adjust the speed of the dots, in case the currents
are so weak (or strong) that the dots are moving too slowly (or too quickly).<o:p></o:p></p>
<p>The <b>Circuits menu</b> can be used to view some interesting pre-defined
circuits. Once a circuit is selected, you may modify it all you want. The
choices are: <o:p></o:p></p>
<ul type=disc>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
mso-list:l2 level1 lfo1;tab-stops:list .5in'><b><span style='mso-fareast-font-family:
"Times New Roman"'>Basics</span></b><span style='mso-fareast-font-family:
"Times New Roman"'><o:p></o:p></span></li>
<ul type=circle>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Resistors</span></b><span
style='mso-fareast-font-family:"Times New Roman"'>: this shows some
resistors of various sizes in series and parallel.<o:p></o:p></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Capacitor</span></b><span
style='mso-fareast-font-family:"Times New Roman"'>: this shows a
capacitor that you can charge and discharge by clicking on the switch.<o:p></o:p></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Inductor</span></b><span
style='mso-fareast-font-family:"Times New Roman"'>: this shows an
inductor that you can charge and discharge by clicking on the switch.<o:p></o:p></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="http://hyperphysics.phy-astr.gsu.edu/hbase/electric/serres.html#c1">LRC
Circuit</a></span></b><span style='mso-fareast-font-family:"Times New Roman"'>:
this shows an oscillating circuit with an inductor, resistor, and
capacitor.<span style='mso-spacerun:yes'>  </span>You can close the
switch to get current moving in the inductor, and then open the switch to
see the oscillation.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="http://hyperphysics.phy-astr.gsu.edu/hbase/electric/voldiv.html">Voltage
Divider</a></span></b><span style='mso-fareast-font-family:"Times New Roman"'>:
this shows a voltage divider, which generates a reference voltage of
7.5V, 5V, and 2.5V from the 10V power supply.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="http://hyperphysics.phy-astr.gsu.edu/hbase/electric/thevenin.html">Thevenins
Theorem</a> </span></b><span style='mso-fareast-font-family:"Times New Roman"'>states
that the circuit on top is equivalent to the circuit on the bottom.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="http://hyperphysics.phy-astr.gsu.edu/hbase/electric/norton.html">Nortons
Theorem</a> </span></b><span style='mso-fareast-font-family:"Times New Roman"'>states
that the circuit on top is equivalent to the circuit on the bottom.<b><o:p></o:p></b></span></li>
</ul>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
mso-list:l2 level1 lfo1;tab-stops:list .5in'><b><span style='mso-fareast-font-family:
"Times New Roman"'>A/C Circuits<o:p></o:p></span></b></li>
<ul type=circle>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="http://hyperphysics.phy-astr.gsu.edu/hbase/electric/accap.html#c1">Capacitor</a></span></b><span
style='mso-fareast-font-family:"Times New Roman"'>: this shows a
capacitor connected to an alternating voltage source.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="http://hyperphysics.phy-astr.gsu.edu/hbase/electric/acind.html#c1">Inductor</a><o:p></o:p></span></b></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Caps of Various
Capacitances</span></b><span style='mso-fareast-font-family:"Times New Roman"'>:
shows the response of three different capacitors to the same frequency.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Caps w/ Various
Frequencies</span></b><span style='mso-fareast-font-family:"Times New Roman"'>:
shows the response of three equal capacitors to three different
frequencies; the higher the frequency, the larger the current.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Inductors of Various
Inductances</span></b><span style='mso-fareast-font-family:"Times New Roman"'>:
shows the response of three different inductors to the same frequency.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Inductors w/ Various
Frequencies</span></b><span style='mso-fareast-font-family:"Times New Roman"'>:
shows the response of three equal inductors to three different
frequencies: the lower the frequency, the larger the current.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Impedances of Same
Magnitude</span></b><span style='mso-fareast-font-family:"Times New Roman"'>:
shows a capacitor, an inductor, and a resistor that have impedances of
equal magnitude (but different phase).<span style='mso-spacerun:yes'> 
</span>The peak current is the same in all three cases.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="http://hyperphysics.phy-astr.gsu.edu/hbase/electric/serres.html#c2">Series
Resonance</a></span></b><span style='mso-fareast-font-family:"Times New Roman"'>:
shows three identical LRC circuits being driven by three different
frequencies.<span style='mso-spacerun:yes'>  </span>The middle one is
being driven at the resonance frequency (shown in the lower right corner
of the screen as “res.f”).<span style='mso-spacerun:yes'>  </span>The top
one is being driven at a slightly lower frequency, and the bottom one has
a slightly higher frequency.<span style='mso-spacerun:yes'>  </span>The
peak voltage in the middle circuit is very high because it is resonating
with the source.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="http://hyperphysics.phy-astr.gsu.edu/hbase/electric/parres.html#c1">Parallel
Resonance</a></span></b><span style='mso-fareast-font-family:"Times New Roman"'>:
these three circuits have the inductor, resistor, and capacitor in
parallel instead of series.<span style='mso-spacerun:yes'>  </span>In this
case, the middle circuit is being driven at resonance, which causes the
current there to be lower than in the other two cases (because the
impedance of the circuit is highest at resonance).<o:p></o:p></span></li>
</ul>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
mso-list:l2 level1 lfo1;tab-stops:list .5in'><b><span style='mso-fareast-font-family:
"Times New Roman"'>Passive Filters<o:p></o:p></span></b></li>
<ul type=circle>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="http://hyperphysics.phy-astr.gsu.edu/hbase/electric/filcap.html">High-Pass
Filter (RC)<span style='font-weight:normal'>.</span></a><span
style='mso-spacerun:yes'>  </span></span></b><span style='mso-fareast-font-family:
"Times New Roman"'>The original signal is shown at the lower left, and
the filtered signal (with the low-frequency part removed) is shown to the
right.<span style='mso-spacerun:yes'>  </span>The breakpoint (-3 dB
point) is shown at the lower right, as “f.3db”.<o:p></o:p></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="http://hyperphysics.phy-astr.gsu.edu/hbase/electric/filcap2.html#c1">Low-Pass
Filter (RC).</a></span></b><span style='mso-fareast-font-family:"Times New Roman"'><o:p></o:p></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>High-Pass Filter (RL).</span></b><span
style='mso-fareast-font-family:"Times New Roman"'><span
style='mso-spacerun:yes'>  </span>This high-pass filter uses an inductor
rather than a capacitor.<o:p></o:p></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Low-Pass Filter (RL). </span></b><span
style='mso-fareast-font-family:"Times New Roman"'><o:p></o:p></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Band-Pass Filter</span></b><span
style='mso-fareast-font-family:"Times New Roman"'>: this filter passes a
range of frequencies close to the resonance frequency (shown at the lower
right, as “res.f”).<o:p></o:p></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Notch Filter</span></b><span
style='mso-fareast-font-family:"Times New Roman"'>: Also known as a
band-stop filter, this circuit filters out a range of frequencies close
to the resonance frequency.<o:p></o:p></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Twin-T Filter</span></b><span
style='mso-fareast-font-family:"Times New Roman"'>: This filter does a
very good job of filtering out 60 Hz signals.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Crossover: </span></b><span
style='mso-fareast-font-family:"Times New Roman"'><span
style='mso-spacerun:yes'> </span>A set of three filters; the top one
passes low frequencies, the middle one passes midrange, and the bottom
one passes high frequencies.<b><o:p></o:p></b></span></li>
</ul>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
mso-list:l2 level1 lfo1;tab-stops:list .5in'><b><span style='mso-fareast-font-family:
"Times New Roman"'>Other Passive Circuits<o:p></o:p></span></b></li>
<ul type=circle>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Series/Parallel<o:p></o:p></span></b></li>
<ol start=1 type=1>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Inductors in Series</span></b><span
style='mso-fareast-font-family:"Times New Roman"'>.<span
style='mso-spacerun:yes'>  </span>The circuit at left is equivalent to
the circuit at right.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Inductors in Parallel.<o:p></o:p></span></b></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Caps in Series.<o:p></o:p></span></b></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Caps in Parallel.<o:p></o:p></span></b></li>
</ol>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Transformers<o:p></o:p></span></b></li>
<ol start=1 type=1>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/transf.html#c1">Transformer</a>:
</span></b><span style='mso-fareast-font-family:"Times New Roman"'>A
basic transformer circuit with an equal number of windings in each coil.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Transformer w/ DC: </span></b><span
style='mso-fareast-font-family:"Times New Roman"'>Here we try to pass a
DC current through a transformer.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Step-Up Transformer: </span></b><span
style='mso-fareast-font-family:"Times New Roman"'>Here we step 10 V up
to 100 V.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Step-Down Transformer:
</span></b><span style='mso-fareast-font-family:"Times New Roman"'>Here
we step 120 V down to 12 V.<b><o:p></o:p></b></span></li>
</ol>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>3-Way Light Switches</span></b><span
style='mso-fareast-font-family:"Times New Roman"'>: shows how a light
bulb can be turned on and off from two locations.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>3- and 4-Way Light
Switches</span></b><span style='mso-fareast-font-family:"Times New Roman"'>:
shows how a light bulb can be turned on and off from three locations.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Differentiator</span></b><span
style='mso-fareast-font-family:"Times New Roman"'>: shows how a capacitor
can act as a differentiator, reflecting changes in voltage.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="http://en.wikipedia.org/wiki/Wheatstone_bridge">Wheatstone Bridge</a></span></b><span
style='mso-fareast-font-family:"Times New Roman"'>: shows a balanced
Wheatstone bridge.<span style='mso-spacerun:yes'>  </span>If the bridge
were not balanced, current would be flowing across from one leg to the other.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="http://en.wikipedia.org/wiki/RLC_circuit">Critically Damped LRC</a>.<o:p></o:p></span></b></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Current Source</span></b><span
style='mso-fareast-font-family:"Times New Roman"'>: shows a source that
keeps the current through the circuit constant regardless of the switch
positions.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Inductive Kickback</span></b><span
style='mso-fareast-font-family:"Times New Roman"'>: In this circuit, we
have a switch that controls the supply of current to an inductor.<span
style='mso-spacerun:yes'>  </span>An inductor resists any changes in
current.<span style='mso-spacerun:yes'>  </span>If you open the switch,
the inductor tries to maintain the same current; it does this by charging
the capacitance between the contacts of the switch.<span
style='mso-spacerun:yes'>  </span>(Any two wires in close proximity have
some parasitic capacitance between them.)<span style='mso-spacerun:yes'> 
</span>There is a small capacitor (much larger than the actual value)
across the switch terminals to simulate this.<span
style='mso-spacerun:yes'>  </span>When you open the switch, the voltage
goes very high; in real life, this would cause arcing.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Blocking Inductive
Kickback</span></b><span style='mso-fareast-font-family:"Times New Roman"'>:
shows how inductive kickback can be blocked with a “snubber” circuit.<br
style='mso-special-character:line-break'>
<![if !supportLineBreakNewLine]><br style='mso-special-character:line-break'>
<![endif]><b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="http://hyperphysics.phy-astr.gsu.edu/hbase/electric/powfac.html">Power
Factor</a>: </span></b><span style='mso-fareast-font-family:"Times New Roman"'>This
circuit shows an inductor being driven by an AC voltage.<span
style='mso-spacerun:yes'>  </span>The colors indicate power consumption;
red means that a component is consuming power, and green means that the
component is contributing power.<span style='mso-spacerun:yes'> 
</span>The left side of the circuit represents the power companys side,
and the right side represents a factory (with a large induction motor).<br>
<br>
The highly inductive load is causing the power company to work a lot
harder than normal for a given amount of power delivered.<b><span
style='mso-spacerun:yes'>  </span></b>The graph on the left indicates the
power lost in the power companys equipment (the resistor at top
left).<span style='mso-spacerun:yes'>  </span>The graph in the middle is
the power delivered to the factory.<span style='mso-spacerun:yes'> 
</span>The graph on the right is the power delivered to the inductor (and
then returned, causing the time average of power delivered to be zero).<br>
<br>
Even though a peak power of 40 mW is being delivered to the factory, 200
mW is being dissipated in the power companys wires.<span
style='mso-spacerun:yes'>  </span>This is why power companies charge
extra for inductive loads.<b><br style='mso-special-character:line-break'>
<![if !supportLineBreakNewLine]><br style='mso-special-character:line-break'>
<![endif]><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="https://web.archive.org/web/20070602205419/http://www.ibiblio.org/obp/electricCircuits/AC/AC_11.html">Power
Factor Correction:</a> </span></b><span style='mso-fareast-font-family:
"Times New Roman"'>Here a capacitor has been added to the circuit,
causing far less energy to be wasted in the power companys wires (aside
from an initial spike to charge the capacitor).<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Resistor Grid</span></b><span
style='mso-fareast-font-family:"Times New Roman"'>: shows current flowing
in a two-dimensional grid of resistors.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Resistor Grid 2.<o:p></o:p></span></b></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Coupled LC's<o:p></o:p></span></b></li>
</ul>
</ul>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:1.5in;text-indent:-.25in;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><![if !supportLists]><span
style='font-size:10.0pt;font-family:"Courier New";mso-fareast-font-family:"Courier New"'><span
style='mso-list:Ignore'>o<span style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;
</span></span></span><![endif]><b>LC Modes(2)</b>: Shows both modes of two
coupled LC circuits.<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:1.5in;text-indent:-.25in;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><![if !supportLists]><span
style='font-size:10.0pt;font-family:"Courier New";mso-fareast-font-family:"Courier New"'><span
style='mso-list:Ignore'>o<span style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;
</span></span></span><![endif]><b>Weak Coupling.</b> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:1.5in;text-indent:-.25in;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><![if !supportLists]><span
style='font-size:10.0pt;font-family:"Courier New";mso-fareast-font-family:"Courier New"'><span
style='mso-list:Ignore'>o<span style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;
</span></span></span><![endif]><b>LC Modes(3)</b>: Shows all 3 modes of 3
coupled LC circuits.<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:1.5in;text-indent:-.25in;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><![if !supportLists]><span
style='font-size:10.0pt;font-family:"Courier New";mso-fareast-font-family:"Courier New";
mso-bidi-font-weight:bold'><span style='mso-list:Ignore'>o<span
style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp; </span></span></span><![endif]><b>LC
Ladder</b>: This circuit is a simple model of a transmission line.<span
style='mso-spacerun:yes'>  </span>A pulse propagates down the length of the
ladder like a wave.<span style='mso-spacerun:yes'>  </span>The resistor at the
end has a value equal to the characteristic impedance of the ladder (determined
by the ratio of L to C), which causes the wave to be absorbed.<span
style='mso-spacerun:yes'>  </span>A larger resistance or an open circuit will
cause the wave to be reflected; a smaller resistance or a short will cause the
wave to be reflected negatively.<b><span style='mso-spacerun:yes'>  </span></b>See
the Feynman Lectures 22-6, 7.<b><o:p></o:p></b></p>
<ul type=disc>
<ul type=circle>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Phase-Sequence Network:</span></b><span
style='mso-fareast-font-family:"Times New Roman"'> This circuit generates
a series of sine waves with a phase difference of 90°.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="http://en.wikipedia.org/wiki/Lissajous_curve">Lissajous Figures</a>:
</span></b><span style='mso-fareast-font-family:"Times New Roman"'>Just
for fun.<b><o:p></o:p></b></span></li>
</ul>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
mso-list:l2 level1 lfo1;tab-stops:list .5in'><b><span style='mso-fareast-font-family:
"Times New Roman"'>Diodes</span></b><span style='mso-fareast-font-family:
"Times New Roman"'><o:p></o:p></span></li>
<ul type=circle>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Half-Wave Rectifier</span></b><span
style='mso-fareast-font-family:"Times New Roman"'>: This circuit removes
the negative part of an input waveform.<o:p></o:p></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Full-Wave Rectifier</span></b><span
style='mso-fareast-font-family:"Times New Roman"'>: This circuit replaces
a waveform with its absolute value.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Full-Wave Rectifier w/
Filter</span></b><span style='mso-fareast-font-family:"Times New Roman"'>:
This circuit smoothes out the rectified waveform, doing a pretty good job
of converting AC to DC.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Diode I/V Curve</span></b><span
style='mso-fareast-font-family:"Times New Roman"'>: This demonstrates the
response of a diode to an applied voltage.<span
style='mso-spacerun:yes'>  </span>The voltage source generates a sawtooth
wave, which starts out at 800 mV and slowly rises to 800 mV, and then
immediately drops back down again.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Diode Limiter</span></b><span
style='mso-fareast-font-family:"Times New Roman"'>.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>DC Restoration.</span></b><span
style='mso-fareast-font-family:"Times New Roman"'><span
style='mso-spacerun:yes'>  </span>This takes an AC signal and adds a DC
offset, making it a positive signal.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Blocking Inductive
Kickback</span></b><span style='mso-fareast-font-family:"Times New Roman"'>:
shows how inductive kickback can be blocked with a diode.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Spike Generator.<o:p></o:p></span></b></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Voltage Multipliers<o:p></o:p></span></b></li>
<ol start=1 type=1>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Voltage Doubler</span></b><span
style='mso-fareast-font-family:"Times New Roman"'>: Doubles the voltage
in the AC input signal (minus two diode drops), and turns it into DC.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Voltage Doubler 2<o:p></o:p></span></b></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Voltage Tripler<o:p></o:p></span></b></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Voltage Quadrupler<o:p></o:p></span></b></li>
</ol>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/amfmdet.html#c1">AM
Detector</a></span></b><span style='mso-fareast-font-family:"Times New Roman"'>:
This is a “crystal radio”, an AM radio receiver with no amplifier.<span
style='mso-spacerun:yes'>  </span>The raw antenna feed is shown in the
first scope slot in the lower left.<span style='mso-spacerun:yes'> 
</span>The inductor and the capacitor C1 are tuned to 3 kHz, the
frequency shown in the lower right as “res.f”.<span
style='mso-spacerun:yes'>  </span>This picks up the carrier wave shown in
the middle scope slot.<span style='mso-spacerun:yes'>  </span>A diode is
used to rectify this, and the C2 capacitor smoothes it out to generate
the audio signal in the last scope slot (which is simply a 12 Hz sine
wave in this example).<span style='mso-spacerun:yes'>  </span>By
experimenting with the value of C1s capacitance, you can pick up two
other “stations” at 2.71 kHz and 2.43 kHz.<o:p></o:p></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Triangle-to-Sine
Converter</span></b><span style='mso-fareast-font-family:"Times New Roman"'><o:p></o:p></span></li>
</ul>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
mso-list:l2 level1 lfo1;tab-stops:list .5in'><b><span style='mso-fareast-font-family:
"Times New Roman"'>Transistors<o:p></o:p></span></b></li>
<ul type=circle>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Switch</span></b><span
style='mso-fareast-font-family:"Times New Roman"'>.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/npncc.html#c2">Emitter
Follower</a>.<o:p></o:p></span></b></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="https://web.archive.org/web/20120101214822/http://www.play-hookey.com/digital/experiments/rtl_astable.html">Astable
Multivibrator</a></span></b><span style='mso-fareast-font-family:"Times New Roman"'>:
A simple oscillator.<span style='mso-spacerun:yes'>  </span>The applet
has trouble simulating this circuit, so there might be a slight delay
every time one of the transistors switches on.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="https://web.archive.org/web/20120101214822/http://www.play-hookey.com/digital/experiments/rtl_bistable.html">Bistable
Multivibrator</a> (Flip Flop)</span></b><span style='mso-fareast-font-family:
"Times New Roman"'>: This circuit has two states; use the set/reset
switches to toggle between them.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="https://web.archive.org/web/20120101214822/http://www.play-hookey.com/digital/experiments/rtl_monostable.html">Monostable
Multivibrator</a> (One-Shot)</span></b><span style='mso-fareast-font-family:
"Times New Roman"'>: When you hit the switch, the output will go to 1.7 V
for a short time, and then drop back down.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Common-Emitter
Amplifier</span></b><span style='mso-fareast-font-family:"Times New Roman"'>:
This circuit amplifies the voltage of the input signal by about 10 times.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Unity-Gain Phase
Splitter: </span></b><span style='mso-fareast-font-family:"Times New Roman"'>Outputs
two signals 180° out of phase from each other.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="https://web.archive.org/web/20120101214822/http://www.play-hookey.com/digital/experiments/rtl_schmitt.html">Schmitt
Trigger</a></span></b><span style='mso-fareast-font-family:"Times New Roman"'>.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Current Source</span></b><span
style='mso-fareast-font-family:"Times New Roman"'>: The current is the
same regardless of the switch position.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Current Source Ramp:</span></b><span
style='mso-fareast-font-family:"Times New Roman"'> Uses a current source
to generate a ramp waveform every time you hit the switch.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Current Mirror</span></b><span
style='mso-fareast-font-family:"Times New Roman"'>: The current on the
right is the same as the current on the left, regardless of the position
of the right switch.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Differential Amplifiers<o:p></o:p></span></b></li>
<ol start=1 type=1>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Differential Input: </span></b><span
style='mso-fareast-font-family:"Times New Roman"'>This circuit subtracts
the first signal from the second and amplifies it.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Common-Mode Input:</span></b><span
style='mso-fareast-font-family:"Times New Roman"'> This shows a
differential amplifier with two equal inputs.<span
style='mso-spacerun:yes'>  </span>The output should be a constant value,
but instead the input waveforms make it through to the output
(attenuated rather than amplified).<span style='mso-spacerun:yes'> 
</span>(When both inputs change together, that is called “common-mode
input”; the “common-mode rejection ratio” is the ability of a
differential amplifier to ignore common-mode signals and amplify only
the difference between the inputs.)<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Common-Mode w/Current
Source: </span></b><span style='mso-fareast-font-family:"Times New Roman"'>This
is an improved differential amplifier that uses a current source as a
load.<span style='mso-spacerun:yes'>  </span>The common-mode rejection
ratio is very good; the circuit amplifies the small differences between
the two inputs, and ignores the common-mode signal.<b><o:p></o:p></b></span></li>
</ol>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Push-Pull Follower: </span></b><span
style='mso-fareast-font-family:"Times New Roman"'>This is another type of
emitter follower.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Oscillators<o:p></o:p></span></b></li>
<ol start=1 type=1>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Colpitts Oscillator<o:p></o:p></span></b></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Hartley Oscillator<o:p></o:p></span></b></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Emitter-Coupled LC
Oscillator<o:p></o:p></span></b></li>
</ol>
</ul>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
mso-list:l2 level1 lfo1;tab-stops:list .5in'><b><span style='mso-fareast-font-family:
"Times New Roman"'><a
href="http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/fet.html">JFETs</a><o:p></o:p></span></b></li>
<ul type=circle>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>JFET Current Source<o:p></o:p></span></b></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>JFET Follower: </span></b><span
style='mso-fareast-font-family:"Times New Roman"'>This is like an emitter
follower, except that the output is 3V more positive than the input.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>JFET Follower w/zero
offset<o:p></o:p></span></b></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/fet.html#c4">Common-Source
Amplifier</a><o:p></o:p></span></b></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Volume Control:</span></b><span
style='mso-fareast-font-family:"Times New Roman"'> Here the JFET is used
like a variable resistor.<b><o:p></o:p></b></span></li>
</ul>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
mso-list:l2 level1 lfo1;tab-stops:list .5in'><b><span style='mso-fareast-font-family:
"Times New Roman"'><a
href="http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/mosfet.html">MOSFETs</a><o:p></o:p></span></b></li>
<ul type=circle>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/buffer.html#c3">CMOS
Inverter</a></span></b><span style='mso-fareast-font-family:"Times New Roman"'>:
The white “H” is a logic input.<span style='mso-spacerun:yes'> 
</span>Click on it to toggle its state.<span style='mso-spacerun:yes'> 
</span>“H” means “high” (5 V) and “L” means “low” (0 V).<span
style='mso-spacerun:yes'>  </span>The output of the inverter is shown at
right, and is the opposite of the input.<span style='mso-spacerun:yes'> 
</span>In this (idealized) simulation, the CMOS inverter draws no current
at all.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>CMOS Inverter
(w/capacitance)</span></b><span style='mso-fareast-font-family:"Times New Roman"'>:
In reality, there are two reasons that CMOS gates draw current.<span
style='mso-spacerun:yes'>  </span>This circuit demonstrates the first
reason: capacitance between the MOSFET gate and its source and
drain.<span style='mso-spacerun:yes'>  </span>It requires current to charge
this capacitance, which consumes power.<span style='mso-spacerun:yes'> 
</span>It also causes a short delay when changing state.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>CMOS Inverter (slow
transition)</span></b><span style='mso-fareast-font-family:"Times New Roman"'>:
The other reason that CMOS gates draw current is that both transistors
will conduct at the same time when the input is halfway between high and
low.<span style='mso-spacerun:yes'>  </span>This causes a current spike
when the input is in transition.<span style='mso-spacerun:yes'> 
</span>In this circuit, there is a low-pass filter on the input which
causes it to transition slowly, so you can see the spike.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>CMOS Transmission Gate</span></b><span
style='mso-fareast-font-family:"Times New Roman"'>: This circuit will
pass any signal, even an analog signal (as long as it stays between 0 and
5 V) when the gate input is “H”.<span style='mso-spacerun:yes'> 
</span>When its “L”, then the gate acts as an open circuit.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>CMOS Multiplexer: </span></b><span
style='mso-fareast-font-family:"Times New Roman"'>This circuit uses two
transmission gates to select one of two inputs.<span
style='mso-spacerun:yes'>  </span>If the logic input is “H”, then the
output is a 40Hz triangle wave.<span style='mso-spacerun:yes'>  </span>If
its “L”, then the output is a 80Hz sine wave.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Sample-and-Hold: </span></b><span
style='mso-fareast-font-family:"Times New Roman"'>Click and hold the
“sample” button to sample the input.<span style='mso-spacerun:yes'> 
</span>When you release the button, the output level will be held
constant.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Delayed Buffer:</span></b><span
style='mso-fareast-font-family:"Times New Roman"'> This circuit delays
any changes in its input for 15 microseconds.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Leading-Edge Detector<o:p></o:p></span></b></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Switchable Filter:</span></b><span
style='mso-fareast-font-family:"Times New Roman"'> Click the “L” to
select from two different low-pass filters.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Voltage Inverter<o:p></o:p></span></b></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Inverter Amplifier: </span></b><span
style='mso-fareast-font-family:"Times New Roman"'>This shows how a CMOS
inverter can be used as an amplifier.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Inverter Oscillator<o:p></o:p></span></b></li>
</ul>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
mso-list:l2 level1 lfo1;tab-stops:list .5in'><b><span style='mso-fareast-font-family:
"Times New Roman"'><a href="http://en.wikipedia.org/wiki/Opamp">Op-Amps</a><o:p></o:p></span></b></li>
<ul type=circle>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Amplifiers<o:p></o:p></span></b></li>
<ol start=1 type=1>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/opampvar.html#c2">Inverting
Amplifier</a></span></b><span style='mso-fareast-font-family:"Times New Roman"'>:
This one has a gain of 3.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/opampvar.html#c3">Non-Inverting
Amplifier</a></span></b><span style='mso-fareast-font-family:"Times New Roman"'><o:p></o:p></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/opampvar2.html#c1">Follower</a></span></b><span
style='mso-fareast-font-family:"Times New Roman"'><o:p></o:p></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/opampvar6.html#c1">Differential
Amplifier</a></span></b><span style='mso-fareast-font-family:"Times New Roman"'><o:p></o:p></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/opampvar5.html#c1">Summing
Amplifier</a></span></b><span style='mso-fareast-font-family:"Times New Roman"'><o:p></o:p></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="http://en.wikipedia.org/wiki/Log_amplifier">Log Amplifier</a>: </span></b><span
style='mso-fareast-font-family:"Times New Roman"'>output is the
(inverted) log of the input<o:p></o:p></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="http://en.wikipedia.org/wiki/Switching_amplifier">Class D
Amplifier</a></span></b><span style='mso-fareast-font-family:"Times New Roman"'><o:p></o:p></span></li>
</ol>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Oscillators</span></b><span
style='mso-fareast-font-family:"Times New Roman"'><o:p></o:p></span></li>
<ol start=1 type=1>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/square.html#c1">Relaxation
Oscillator</a></span></b><span style='mso-fareast-font-family:"Times New Roman"'><o:p></o:p></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/oscphas.html">Phase-Shift
Oscillator</a></span></b><span style='mso-fareast-font-family:"Times New Roman"'><o:p></o:p></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="https://web.archive.org/web/20120101214822/http://www.play-hookey.com/analog/triangle_waveform_generator.html">Triangle
Wave Generator</a></span></b><span style='mso-fareast-font-family:"Times New Roman"'><o:p></o:p></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="https://web.archive.org/web/20120101214822/http://www.play-hookey.com/analog/sine_wave_generator.html">Sine
Wave Generator</a></span></b><span style='mso-fareast-font-family:"Times New Roman"'><o:p></o:p></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="https://web.archive.org/web/20070305103911/http://www.interq.or.jp/japan/se-inoue/e_ckt17.htm">Sawtooth Wave
Generator</a><o:p></o:p></span></b></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Voltage-Controlled
Oscillator: </span></b><span style='mso-fareast-font-family:"Times New Roman"'>Here
the frequency of oscillation depends on the input (shown in the scope on
the left).<span style='mso-spacerun:yes'>  </span>The oscillator outputs
a square wave and a triangle wave.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="http://en.wikipedia.org/wiki/Rossler_attractor">Rossler</a> <a
href="https://web.archive.org/web/20150705151403/http://math.arizona.edu/~ura/004/bergevin.chris/sync.html">Circuit</a><o:p></o:p></span></b></li>
</ol>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Half-Wave Rectifier</span></b><span
style='mso-fareast-font-family:"Times New Roman"'>: An active rectifier
that works on voltages smaller than a diode drop.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Full-Wave Rectifier<o:p></o:p></span></b></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Peak Detector</span></b><span
style='mso-fareast-font-family:"Times New Roman"'>: This circuit outputs
the peak voltage of the input.<span style='mso-spacerun:yes'> 
</span>Whenever the input voltage is higher than the output, the output
will be adjusted upward to match.<span style='mso-spacerun:yes'> 
</span>Press the switch marked “reset” to reset the peak voltage back to 0.<o:p></o:p></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/opampvar4.html#c1">Integrator</a></span></b><span
style='mso-fareast-font-family:"Times New Roman"'><o:p></o:p></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/opampvar4.html#c2">Differentiator</a></span></b><span
style='mso-fareast-font-family:"Times New Roman"'><o:p></o:p></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/schmitt.html">Schmitt
Trigger</a></span></b><span style='mso-fareast-font-family:"Times New Roman"'><o:p></o:p></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Negative Impedance
Converter: </span></b><span style='mso-fareast-font-family:"Times New Roman"'>Converts
the resistor to a “negative” resistor.<span style='mso-spacerun:yes'> 
</span>In the first graph, note that the current is 180° out of phase
with the voltage.<o:p></o:p></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="http://en.wikipedia.org/wiki/Gyrator">Gyrator</a></span></b><span
style='mso-fareast-font-family:"Times New Roman"'>: The top circuit
simulates the bottom circuit without using an inductor.<o:p></o:p></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Capacitance Multiplier</span></b><span
style='mso-fareast-font-family:"Times New Roman"'>: This circuit allows
you to simulate a large capacitor with a smaller one.<span
style='mso-spacerun:yes'>  </span>The effective capacitance of the top
circuit is C1 x (R1/R2), and the effective resistance is R2.<o:p></o:p></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Howland Current Source</span></b><span
style='mso-fareast-font-family:"Times New Roman"'><o:p></o:p></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>I-to-V Converter: </span></b><span
style='mso-fareast-font-family:"Times New Roman"'>The output voltage
depends on the input current, which you can adjust with the switches.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="http://en.wikipedia.org/wiki/Opamp#Internal_circuitry">741
Internals</a>:</span></b><span style='mso-fareast-font-family:"Times New Roman"'>
The implementation of a 741 op-amp.<b><o:p></o:p></b></span></li>
</ul>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
mso-list:l2 level1 lfo1;tab-stops:list .5in'><b><span style='mso-fareast-font-family:
"Times New Roman"'><a href="http://en.wikipedia.org/wiki/555_timer_IC">555
Timer Chip</a><o:p></o:p></span></b></li>
<ul type=circle>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Square Wave Generator<o:p></o:p></span></b></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Internals:</span></b><span
style='mso-fareast-font-family:"Times New Roman"'> The implementation of
a 555 chip, acting as a square wave oscillator<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Sawtooth Oscillator<o:p></o:p></span></b></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Low-duty-cycle Oscillator</span></b><span
style='mso-fareast-font-family:"Times New Roman"'>: produces short
pulses.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Monostable
Multivibrator</span></b><span style='mso-fareast-font-family:"Times New Roman"'>:
This is a one-shot circuit that will produce a timed pulse when you click
the “H”.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Pulse Position
Modulator: </span></b><span style='mso-fareast-font-family:"Times New Roman"'>Produces
pulses whose width is proportional to the input voltage.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Schmitt Trigger<o:p></o:p></span></b></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Missing Pulse Detector:
</span></b><span style='mso-fareast-font-family:"Times New Roman"'>Setting
the logic input low will turn off the square wave input.<span
style='mso-spacerun:yes'>  </span>The missing pulse detector will detect
the missing input and bring the output high.<b><o:p></o:p></b></span></li>
</ul>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
mso-list:l2 level1 lfo1;tab-stops:list .5in'><b><span style='mso-fareast-font-family:
"Times New Roman"'>Active Filters<o:p></o:p></span></b></li>
<ul type=circle>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>VCVS Low-Pass Filter:</span></b><span
style='mso-fareast-font-family:"Times New Roman"'> An active Butterworth
low-pass filter.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>VCVS High-Pass Filter<o:p></o:p></span></b></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Switched-Capacitor
Filter:</span></b><span style='mso-fareast-font-family:"Times New Roman"'>
A digital filter, implemented using capacitors and analog switches.<b><o:p></o:p></b></span></li>
</ul>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
mso-list:l2 level1 lfo1;tab-stops:list .5in'><b><span style='mso-fareast-font-family:
"Times New Roman"'>Logic Families<o:p></o:p></span></b></li>
<ul type=circle>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>RTL Logic Family<o:p></o:p></span></b></li>
<ol start=1 type=1>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="https://web.archive.org/web/20120101214822/http://www.play-hookey.com/digital/experiments/rtl_inverter.html">RTL
Inverter</a></span></b><span style='mso-fareast-font-family:"Times New Roman"'>:
The white “H” is a logic input.<span style='mso-spacerun:yes'> 
</span>Click on it to toggle its state.<span style='mso-spacerun:yes'> 
</span>“H” means “high” (3.6 V) and “L” means “low” (0 V).<span
style='mso-spacerun:yes'>  </span>The output of the inverter is shown at
right, and is the opposite of the input.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="https://web.archive.org/web/20120101214822/http://www.play-hookey.com/digital/experiments/rtl_nor4.html">RTL
NOR</a></span></b><span style='mso-fareast-font-family:"Times New Roman"'>:
The three inputs are at the bottom, and the output is to the right.<span
style='mso-spacerun:yes'>  </span>The output is “L” if any of the inputs
are “H”.<span style='mso-spacerun:yes'>  </span>Otherwise its “H”.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>RTL NAND</span></b><span
style='mso-fareast-font-family:"Times New Roman"'>: The output is “H”
unless all three inputs are “H”, and then its “L”.<b><o:p></o:p></b></span></li>
</ol>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>DTL Logic Family<o:p></o:p></span></b></li>
<ol start=1 type=1>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="https://web.archive.org/web/20120101214822/http://www.play-hookey.com/digital/experiments/dtl_inverter.html">DTL
Inverter</a><o:p></o:p></span></b></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="https://web.archive.org/web/20120101214822/http://www.play-hookey.com/digital/experiments/dtl_nand3.html">DTL
NAND</a><o:p></o:p></span></b></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="https://web.archive.org/web/20120101214822/http://www.play-hookey.com/digital/experiments/dtl_nor2.html">DTL
NOR</a><o:p></o:p></span></b></li>
</ol>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>TTL Logic Family<o:p></o:p></span></b></li>
<ol start=1 type=1>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="https://web.archive.org/web/20120101214822/http://www.play-hookey.com/digital/experiments/ttl_inverter.html">TTL
Inverter</a><o:p></o:p></span></b></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>TTL NAND<o:p></o:p></span></b></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="https://web.archive.org/web/20120101214822/http://www.play-hookey.com/digital/experiments/ttl_inverter.html">TTL
NOR</a><o:p></o:p></span></b></li>
</ol>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="http://en.wikipedia.org/wiki/NMOS">NMOS Logic Family</a><o:p></o:p></span></b></li>
<ol start=1 type=1>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>NMOS Inverter<o:p></o:p></span></b></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>NMOS Inverter 2</span></b><span
style='mso-fareast-font-family:"Times New Roman"'>: This uses a second
MOSFET instead of a resistor, to save space on a chip.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>NMOS NAND<o:p></o:p></span></b></li>
</ol>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="https://web.archive.org/web/20120101214822/http://www.play-hookey.com/digital/electronics/cmos_gates.html">CMOS
Logic Family</a><o:p></o:p></span></b></li>
<ol start=1 type=1>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>CMOS Inverter<o:p></o:p></span></b></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>CMOS NAND<o:p></o:p></span></b></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>CMOS NOR<o:p></o:p></span></b></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>CMOS XOR<o:p></o:p></span></b></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/nandlatch.html#c1">CMOS
Flip-Flop</a> (or latch)</span></b><span style='mso-fareast-font-family:
"Times New Roman"'>: This circuit consists of two CMOS NAND gates.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="https://web.archive.org/web/20120101214822/http://www.play-hookey.com/digital/cmos_d_flip-flop.html">CMOS
Master-Slave Flip-Flop</a><o:p></o:p></span></b></li>
</ol>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="https://web.archive.org/web/20120101214822/http://www.play-hookey.com/digital/electronics/ecl_gates.html">ECL
Logic Family</a><o:p></o:p></span></b></li>
<ol start=1 type=1>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>ECL NOR/OR<o:p></o:p></span></b></li>
</ol>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="http://www.google.com/patents?vid=USPAT6133754">Ternary</a>: </span></b><span
style='mso-fareast-font-family:"Times New Roman"'>This demonstrates
three-valued logic, where the inputs can be 0, 1, or 2 instead of H and
L.<span style='mso-spacerun:yes'>  </span>This logic is implemented using
MOSFETs; the <a href="http://en.wikipedia.org/wiki/Threshold_voltage">threshold
voltage</a> of each one is shown.<b><o:p></o:p></b></span></li>
<ol start=1 type=1>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>CGAND: </span></b><span
style='mso-fareast-font-family:"Times New Roman"'>the output is 2-X
where X is the minimum of the two inputs.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>CGOR: </span></b><span
style='mso-fareast-font-family:"Times New Roman"'>the output is 2-X
where X is the maximum of the two inputs.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Complement.<o:p></o:p></span></b></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>F211: </span></b><span
style='mso-fareast-font-family:"Times New Roman"'>0 becomes 2, 1 becomes
1, 2 becomes 1.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>F220<o:p></o:p></span></b></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>F221<o:p></o:p></span></b></li>
</ol>
</ul>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
mso-list:l2 level1 lfo1;tab-stops:list .5in'><b><span style='mso-fareast-font-family:
"Times New Roman"'>Combinational Logic<o:p></o:p></span></b></li>
<ul type=circle>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="https://web.archive.org/web/20120101214822/http://www.play-hookey.com/digital/xor_function.html">Exclusive OR
(XOR)</a></span></b><span style='mso-fareast-font-family:"Times New Roman"'>
<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="https://web.archive.org/web/20120101214822/http://www.play-hookey.com/digital/adder.html">Half Adder</a><o:p></o:p></span></b></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="https://web.archive.org/web/20120101214822/http://www.play-hookey.com/digital/adder.html">Full Adder</a><o:p></o:p></span></b></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>1-of-4 Decoder<o:p></o:p></span></b></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="https://web.archive.org/web/20120101214822/http://www.play-hookey.com/digital/multiplexer_two_input.html">2-to-1
Mux</a>: </span></b><span style='mso-fareast-font-family:"Times New Roman"'>This
multiplexer uses two tri-state buffers connected to the output.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Majority Logic: </span></b><span
style='mso-fareast-font-family:"Times New Roman"'>The output is high if a
majority of the inputs are high.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>2-Bit Comparator</span></b><span
style='mso-fareast-font-family:"Times New Roman"'>: Tells you if the
two-bit input A is greater than, less than, or equal to the two-bit input
B.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>7-Segment LED Decoder<o:p></o:p></span></b></li>
</ul>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
mso-list:l2 level1 lfo1;tab-stops:list .5in'><b><span style='mso-fareast-font-family:
"Times New Roman"'>Sequential Logic<o:p></o:p></span></b></li>
<ul type=circle>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Flip-Flops<o:p></o:p></span></b></li>
<ol start=1 type=1>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="https://web.archive.org/web/20120101214822/http://www.play-hookey.com/digital/rs_nand_latch.html">SR
Flip-Flop</a><o:p></o:p></span></b></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="https://web.archive.org/web/20120101214822/http://www.play-hookey.com/digital/clocked_rs_latch.html">Clocked
SR Flip-Flop</a><o:p></o:p></span></b></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="https://web.archive.org/web/20120101214822/http://www.play-hookey.com/digital/d_nand_flip-flop.html">Master-Slave
Flip-Flop</a><o:p></o:p></span></b></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Edge-Triggered D
Flip-Flop</span></b><span style='mso-fareast-font-family:"Times New Roman"'>:
This circuit changes state when the clock makes a positive transistion.<b><o:p></o:p></b></span></li>
</ol>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Counters<o:p></o:p></span></b></li>
<ol start=1 type=1>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="https://web.archive.org/web/20120101214822/http://www.play-hookey.com/digital/ripple_counter.html">4-Bit
Ripple Counter</a><o:p></o:p></span></b></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>8-Bit Ripple Counter<o:p></o:p></span></b></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="https://web.archive.org/web/20120101214822/http://www.play-hookey.com/digital/synchronous_counter.html">Synchronous
Counter</a><o:p></o:p></span></b></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="https://web.archive.org/web/20120101214822/http://www.play-hookey.com/digital/decimal_counter.html">Decimal
Counter</a><o:p></o:p></span></b></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="http://en.wikipedia.org/wiki/Gray_code">Gray Code Counter</a><o:p></o:p></span></b></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level3 lfo1;tab-stops:list 1.5in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="https://web.archive.org/web/20120101214822/http://www.play-hookey.com/digital/johnson_counter.html">Johnson
Counter</a><o:p></o:p></span></b></li>
</ol>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="https://web.archive.org/web/20120101214822/http://www.play-hookey.com/digital/frequency_dividers.html">Divide-by-2</a>:</span></b><span
style='mso-fareast-font-family:"Times New Roman"'> Divides the input
frequency by 2.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="https://web.archive.org/web/20120101214822/http://www.play-hookey.com/digital/frequency_dividers.html">Divide-by-3</a><o:p></o:p></span></b></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>LED Flasher: </span></b><span
style='mso-fareast-font-family:"Times New Roman"'>This circuit uses a
decade counter to flash some LEDs in a back and forth pattern.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="https://web.archive.org/web/20051001005653/http://ourworld.compuserve.com/homepages/Bill_Bowden/page10.htm">Traffic
Light</a><o:p></o:p></span></b></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Dynamic RAM:</span></b><span
style='mso-fareast-font-family:"Times New Roman"'> This is a simple model
of a dynamic RAM chip.<span style='mso-spacerun:yes'>  </span>To read
from the chip, select the bit you want using the row select lines.<span
style='mso-spacerun:yes'>  </span>To write, select the data bit you want
to write, and click the “write” switch.<span style='mso-spacerun:yes'> 
</span>To refresh a bit, click the “refresh” switch.<b><o:p></o:p></b></span></li>
</ul>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
mso-list:l2 level1 lfo1;tab-stops:list .5in'><b><span style='mso-fareast-font-family:
"Times New Roman"'>Analog/Digital<o:p></o:p></span></b></li>
<ul type=circle>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="http://en.wikipedia.org/wiki/Analog-to-digital_converter#ADC_structures">Flash
ADC</a>:</span></b><span style='mso-fareast-font-family:"Times New Roman"'>
This is a direct-conversion, or “flash” analog-to-digital converter.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="http://en.wikipedia.org/wiki/Delta-sigma_modulation">Delta-Sigma
ADC</a><o:p></o:p></span></b></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="https://www.maximintegrated.com/en/design/technical-documents/tutorials/1/1023.html">Half-Flash
(Subranging) ADC</a>: </span></b><span style='mso-fareast-font-family:
"Times New Roman"'>Also known as a pipeline ADC.<span
style='mso-spacerun:yes'>  </span>The first stage converts the input
voltage to a four-bit digital value.<span style='mso-spacerun:yes'> 
</span>Then, a DAC converts these four bits to analog, and then a
comparator calculates the difference between this and the input voltage.<span
style='mso-spacerun:yes'>  </span>Another ADC converts this to digital,
giving a total of eight bits. <b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="http://en.wikipedia.org/wiki/Digital_to_analog_converter#DAC_types">Binary-Weighted
DAC</a></span></b><span style='mso-fareast-font-family:"Times New Roman"'>:<span
style='mso-spacerun:yes'>  </span>Converts a four-bit binary number to a
negative voltage.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="http://en.wikipedia.org/wiki/Digital_to_analog_converter#DAC_types">R-2R
Ladder DAC</a><o:p></o:p></span></b></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Switch Tree DAC<o:p></o:p></span></b></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Digital Sine Wave<o:p></o:p></span></b></li>
</ul>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
mso-list:l2 level1 lfo1;tab-stops:list .5in'><b><span style='mso-fareast-font-family:
"Times New Roman"'><a href="http://en.wikipedia.org/wiki/PLL">Phase-Locked
Loops</a><o:p></o:p></span></b></li>
<ul type=circle>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>XOR Phase Detector:</span></b><span
style='mso-fareast-font-family:"Times New Roman"'> Shows an XOR gate
being used as a type I phase detector.<span style='mso-spacerun:yes'> 
</span>The output is high whenever the two input signals are not in
phase.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'><a
href="https://web.archive.org/web/20080701001734/http://www.uoguelph.ca/~antoon/gadgets/pll/pll.html">Type I PLL</a>:</span></b><span
style='mso-fareast-font-family:"Times New Roman"'> This phase-locked loop
circuit consists of an XOR gate (the phase detector), a low-pass filter
(the resistor and capacitor), a follower (the op-amp), and a voltage-controlled
oscillator chip.<span style='mso-spacerun:yes'>  </span>The
voltage-controlled oscillator outputs a frequency proportional to the
input voltage.<span style='mso-spacerun:yes'>  </span>After the PLL
circuit locks onto the input frequency, the output frequency will be the
same as the input frequency (with a small phase delay).<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Phase Comparator (Type
II): </span></b><span style='mso-fareast-font-family:"Times New Roman"'>Shows
a more sophisticated phase detector, which has no output when the inputs
are in phase, but outputs high (5V) when input 1 is leading input 2, and
low (0V) when input 2 is leading input 1.<span style='mso-spacerun:yes'> 
</span>The phase comparator and VCO in this applet are based on the <a
href="http://www.fairchildsemi.com/pf/MM/MM74HC4046.html">4046 chip</a>.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Phase Comparator
Internals.<o:p></o:p></span></b></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Type II PLL: </span></b><span
style='mso-fareast-font-family:"Times New Roman"'>Shows a phase-locked
loop with a type II phase detector.<span style='mso-spacerun:yes'> 
</span>If you adjust the input frequency, the output should lock onto it
in a short time.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Type II PLL (fast):</span></b><span
style='mso-fareast-font-family:"Times New Roman"'> Just a faster
simulation of the type II PLL.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Frequency Doubler<o:p></o:p></span></b></li>
</ul>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
mso-list:l2 level1 lfo1;tab-stops:list .5in'><b><span style='mso-fareast-font-family:
"Times New Roman"'><a href="http://en.wikipedia.org/wiki/Transmission_line">Transmission
Lines</a><o:p></o:p></span></b></li>
<ul type=circle>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Simple TL: </span></b><span
style='mso-fareast-font-family:"Times New Roman"'>A properly terminated
transmission line, showing the delay as the signal travels down the line.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Standing Wave: </span></b><span
style='mso-fareast-font-family:"Times New Roman"'>A standing wave on a
shorted transmission line.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Termination: </span></b><span
style='mso-fareast-font-family:"Times New Roman"'>The top line is
terminated properly, but the others are not, and so the incoming wave is
reflected.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Mismatched lines: </span></b><span
style='mso-fareast-font-family:"Times New Roman"'>Shows reflections
caused by the middle line having a different impedance than the other two
lines.<b><o:p></o:p></b></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l2 level2 lfo1;tab-stops:list 1.0in'><b><span
style='mso-fareast-font-family:"Times New Roman"'>Mismatched lines 2: </span></b><span
style='mso-fareast-font-family:"Times New Roman"'>Shows a standing wave
on the first line, caused by the second line having a different
impedance.<b><o:p></o:p></b></span></li>
</ul>
</ul>
<p>&nbsp;</p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>To
add a new component to the circuit, click the right mouse button on an unused
area of the window.<span style='mso-spacerun:yes'>  </span>This will bring up a
menu that allows you to select what component you want.<span
style='mso-spacerun:yes'>  </span>Then click where you want the first terminal
of the component, and drag to where you want the other terminal.<span
style='mso-spacerun:yes'>  </span>The menu items allow you to create:<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.25in;text-indent:-.25in;mso-list:l0 level1 lfo2;tab-stops:list .25in'><![if !supportLists]><span
style='font-family:Symbol;mso-fareast-font-family:Symbol;mso-bidi-font-family:
Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]>wires<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.25in;text-indent:-.25in;mso-list:l0 level1 lfo2;tab-stops:list .25in'><![if !supportLists]><span
style='font-family:Symbol;mso-fareast-font-family:Symbol;mso-bidi-font-family:
Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]>resistors; you can adjust the resistance after
creating the resistor by clicking the right mouse button and selecting “Edit”<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.25in;text-indent:-.25in;mso-list:l0 level1 lfo2;tab-stops:list .25in'><![if !supportLists]><span
style='font-family:Symbol;mso-fareast-font-family:Symbol;mso-bidi-font-family:
Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]>capacitors; you can adjust the capacitance using
“Edit”<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.25in;text-indent:-.25in;mso-list:l0 level1 lfo2;tab-stops:list .25in'><![if !supportLists]><span
style='font-family:Symbol;mso-fareast-font-family:Symbol;mso-bidi-font-family:
Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]>inductors, switches, transistors, etc.<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.25in;text-indent:-.25in;mso-list:l0 level1 lfo2;tab-stops:list .25in'><![if !supportLists]><span
style='font-family:Symbol;mso-fareast-font-family:Symbol;mso-bidi-font-family:
Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]>voltage sources, in either 1-terminal or
2-terminal varieties.<span style='mso-spacerun:yes'>  </span>The 1-terminal
versions use ground as the other terminal.<span style='mso-spacerun:yes'> 
</span>By clicking the right mouse button and selecting “Edit”, you can modify
the voltage and the waveform of the voltage source, changing it to DC, AC (sine
wave), square wave, triangle, sawtooth, or pulse.<span
style='mso-spacerun:yes'>  </span>If its not a DC source, you can also change
the frequency and the DC offset.<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.25in;text-indent:-.25in;mso-list:l0 level1 lfo2;tab-stops:list .25in'><![if !supportLists]><span
style='font-family:Symbol;mso-fareast-font-family:Symbol;mso-bidi-font-family:
Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]>op-amps, with power supply limits of 15V and
15V assumed (not shown).<span style='mso-spacerun:yes'>  </span>The limits can
be adjusted using “Edit”.<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.25in;text-indent:-.25in;mso-list:l0 level1 lfo2;tab-stops:list .25in'><![if !supportLists]><span
style='font-family:Symbol;mso-fareast-font-family:Symbol;mso-bidi-font-family:
Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]>text labels, which you can modify with the
“Edit” dialog<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.25in;text-indent:-.25in;mso-list:l0 level1 lfo2;tab-stops:list .25in'><![if !supportLists]><span
style='font-family:Symbol;mso-fareast-font-family:Symbol;mso-bidi-font-family:
Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]>test points; these have no effect on the
circuit, but if you select them and use the right mouse menu item “View in
Scope”, you can view the voltage difference between the terminals.<o:p></o:p></p>
<p>Also in the “Other” submenu, there are some items that allow you to click
and drag sections of the circuit around.<o:p></o:p></p>
<p>You can drag the circuit around by clicking and dragging with the Alt key
held down.<span style='mso-spacerun:yes'>  </span>Zoom in and out with the
mouse wheel or by using the zoom commands in the Edit menu.<o:p></o:p></p>
<p>To edit one of the scope views, click the right mouse button on it to view a
menu.<span style='mso-spacerun:yes'>  </span>The menu items allow you to remove
a scope view, speed up or slow down the display, adjust the scale, select what
value(s) you want to view, etc.<o:p></o:p></p>
<p>The time step size is the time between iterations of the simulator.<span
style='mso-spacerun:yes'>  </span>Smaller time steps make the simulation more
accurate, but slower.<span style='mso-spacerun:yes'>  </span>A smaller time
step size is required to simulate high frequencies.<span
style='mso-spacerun:yes'>  </span>A larger time step size may be appropriate
for circuits that run in real time.<span style='mso-spacerun:yes'>  </span>Use <b
style='mso-bidi-font-weight:normal'>Edit-&gt;Other Options…</b> to change the
time step size.<o:p></o:p></p>
<p><b style='mso-bidi-font-weight:normal'>File-&gt;Recover Auto-Save</b> lets
you recover a circuit lost when the simulator window was closed.<span
style='mso-spacerun:yes'>  </span>If this doesnt work, try <b
style='mso-bidi-font-weight:normal'>Edit-&gt;Undo</b> instead.<o:p></o:p></p>
<p><b style='mso-bidi-font-weight:normal'>File-&gt;Find DC Operating Point</b>
is useful with circuits that take a long time to reach a useful state.<span
style='mso-spacerun:yes'>  </span>This option instantly charges all the
capacitors.<o:p></o:p></p>
<p>Here are some errors you might encounter when using the simulator:<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.25in;text-indent:-.25in;mso-list:l1 level1 lfo3;tab-stops:list .25in'><![if !supportLists]><span
style='font-family:Symbol;mso-fareast-font-family:Symbol;mso-bidi-font-family:
Symbol;mso-bidi-font-weight:bold'><span style='mso-list:Ignore'>·<span
style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span></span><![endif]><b>Voltage
source loop with no resistance!</b> this means one of the voltage sources in
your circuit is shorted.<span style='mso-spacerun:yes'>  </span>Make sure there
is some resistance across every voltage source.<b><o:p></o:p></b></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.25in;text-indent:-.25in;mso-list:l1 level1 lfo3;tab-stops:list .25in'><![if !supportLists]><span
style='font-family:Symbol;mso-fareast-font-family:Symbol;mso-bidi-font-family:
Symbol;mso-bidi-font-weight:bold'><span style='mso-list:Ignore'>·<span
style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span></span><![endif]><b>Capacitor
loop with no resistance! </b> its not allowed to have any current loops
containing capacitors but no resistance.<span style='mso-spacerun:yes'> 
</span>For example, capacitors connected in parallel are not allowed; you must
put a resistor in series with them.<span style='mso-spacerun:yes'> 
</span>Shorted capacitors are allowed.<b><o:p></o:p></b></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.25in;text-indent:-.25in;mso-list:l1 level1 lfo3;tab-stops:list .25in'><![if !supportLists]><span
style='font-family:Symbol;mso-fareast-font-family:Symbol;mso-bidi-font-family:
Symbol;mso-bidi-font-weight:bold'><span style='mso-list:Ignore'>·<span
style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span></span><![endif]><b>Singular
matrix!</b> this means that your circuit is inconsistent (two different
voltage sources connected to each other), or that the voltage at some point is
undefined.<span style='mso-spacerun:yes'>  </span>It might mean that some
components terminals are unconnected; for example, if you create an op-amp but
havent connected anything to it yet, you will get this error.<span
style='mso-spacerun:yes'>  </span><b><o:p></o:p></b></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.25in;text-indent:-.25in;mso-list:l1 level1 lfo3;tab-stops:list .25in'><![if !supportLists]><span
style='font-family:Symbol;mso-fareast-font-family:Symbol;mso-bidi-font-family:
Symbol;mso-bidi-font-weight:bold'><span style='mso-list:Ignore'>·<span
style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span></span><![endif]><b>Convergence
failed!</b> this means the simulator cant figure out what the state of the
circuit should be.<span style='mso-spacerun:yes'>  </span>Just click <b>Reset</b>
and hopefully that should fix it.<span style='mso-spacerun:yes'>  </span>Your
circuit might be too complicated, but this happens sometimes even with the
examples.<b><o:p></o:p></b></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.25in;text-indent:-.25in;mso-list:l1 level1 lfo3;tab-stops:list .25in'><![if !supportLists]><span
style='font-family:Symbol;mso-fareast-font-family:Symbol;mso-bidi-font-family:
Symbol;mso-bidi-font-weight:bold'><span style='mso-list:Ignore'>·<span
style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span></span><![endif]><b>Transmission
line delay too large! </b> the transmission line delay is too large compared
to the timestep of the simulator, so too much memory would be required.<span
style='mso-spacerun:yes'>  </span>Make the delay smaller.<b><o:p></o:p></b></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.25in;text-indent:-.25in;mso-list:l1 level1 lfo3;tab-stops:list .25in'><![if !supportLists]><span
style='font-family:Symbol;mso-fareast-font-family:Symbol;mso-bidi-font-family:
Symbol;mso-bidi-font-weight:bold'><span style='mso-list:Ignore'>·<span
style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span></span><![endif]><b>Need
to ground transmission line! </b> the bottom two wires of a transmission line
must always be grounded in this simulator.<b><o:p></o:p></b></p>
<p><a href="index.html">Click here to go to the applet.</a>
<o:p></o:p></p>
<p class=MsoNormal align=center style='text-align:center'><!--[if mso & !supportInlineShapes & supportFields]><span
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