Circuit Simulator Program

[slayer007]

This link is to a free circuit simulator program.
Very nice for beginers who want to know how circuits work.

http://www.falstad.com/circuit/

[amigo]

Nice one, thanks !

[Vortex]

Yeppers

Thanks slayer007

Talk about saving (Me) tons of money ..

No more fried LEDs or Books I haven't read.

AND a scope , zough-wee ..

Simulated FREE ENERGY .. Here I come.

My addition for beginners and even non-beginners
Very brief 72 pages quick intro .. Notebook 'D': Electricity and Magnetism Lecture Demonstrations
Every page has an experiment that shows the subject being discussed.

Ok, maybe I was a little too excited.
This looks like it's going to be a lot of work.

Electronics Demonstrations available listed below.

* Basics
o Ohm's Law
o Resistors
o Capacitor
o Inductor
o RLC Circuit
o Voltage Divider
o Series/Parallel
+ Inductors in Series
+ Inductors in Parallel
+ Capacitors in Series
+ Capacitors in Parallel
o Thevenin's Theorem
o Norton's Theorem
* A/C Circuits
o A/C Response of Capacitor
o A/C Response of Inductor
o Caps of Various Capacitances
o Caps w/ Various Frequencies
o Inductors of Various Inductances
o Inductors w/ Various Frequencies
o Impedances of Same Magnitude
o Series Resonance
o Parallel Resonance
* Passive Filters
o High-Pass Filter (RC)
o Low-Pass Filter (RC)
o High-Pass Filter (RL)
o Low-Pass Filter (RL)
o Band-Pass Filter
o Notch Filter
o Twin-T Filter
o Crossover
* Other Passive Circuits
o 3-Way Light Switches
o 3- and 4-Way Light Switches
o Differentiator
o Wheatstone Bridge
o Critically Damped RLC
o Current Source
o Transformers
+ Transformer
+ Step-Up Transformer
+ Step-Down Transformer
+ Long Distance Power Transmission
+ Transformer w/ DC
o Inductive Kickback
o Blocking Inductive Kickback
o Power Factor
o Power Factor Correction
o LC Ladder
o Phase-Sequence Network
* Diodes
o Diode
o Diode I/V Curve
o Half-Wave Rectifier
o Full-Wave Rectifier
o Full-Wave Rectifier w/ Filter
o Diode Limiter
o Zener Diodes
+ Zener I/V Curve
+ Zener Voltage Reference
+ Zener Voltage Reference w/ Follower
o DC Restoration
o Blocking Inductive Kickback
o Spike Generator
o Voltage Multipliers
+ Voltage Doubler
+ Voltage Tripler
+ Voltage Quadrupler
o AM Detector
o Waveform Clipper
o Triangle-to-Sine Converter
* Op-Amps
o Op-Amp
o Op-Amp Feedback
o Amplifiers
+ Inverting Amplifier
+ Noninverting Amplifier
+ Follower
+ Differential Amplifier
+ Summing Amplifier
+ Log Amplifier
+ Class-D Amplifier
o Half-Wave Rectifier (inverting)
o Full-Wave Rectifier
o Peak Detector
o Integrator
o Differentiator (inverting)
o Schmitt Trigger
o Oscillators
+ Relaxation Oscillator
+ Triangle Wave Generator
+ Sawtooth Wave Generator
+ Sine Wave Generator
+ Voltage-Controlled Oscillator
+ Phase-Shift Oscillator
o Negative Impedance Converter
o Gyrator
o Capacitance Multiplier
o Howland Current Source
o Current-to-Voltage Converter
* MOSFETs
o n-MOSFET
o p-MOSFET
o Switch
o Source Follower
o Current Source
o Current Ramp
o Current Mirror
o Common-Source Amplifier
o CMOS Inverter
o CMOS Inverter (w/capacitance)
o CMOS Inverter (slow transition)
o CMOS Transmission Gate
o CMOS Multiplexer
o Sample-and-Hold
o Delayed Buffer
o Leading-Edge Detector
o Switchable Filter
o Voltage Inverter
o Inverter Amplifier
o Inverter Oscillator
o Logic
+ CMOS NAND
+ CMOS NOR
+ CMOS XOR
+ CMOS Flip-Flop
+ CMOS Master-Slave Flip-Flop
+ Ternary Logic Inverter
* Transistors (Bipolar)
o NPN Transistor (Bipolar)
o PNP Transistor (Bipolar)
o Switch
o Emitter Follower
o Common-Emitter Amplifier
o Unity-Gain Phase Splitter
o Schmitt Trigger
o Current Source
o Current Source Ramp
o Current Mirror
o Differential Amplifiers
+ Differential Amplifier
+ Differential Amplifier: Common-Mode Input
+ Differential Amplifier: Common-Mode w/Current Source
o Push-Pull Follower
+ Simple Push-Pull Follower, with Distortion
+ Improved Push-Pull Follower
o Multivibrators
+ Bistable Multivibrator (Flip-Flop)
+ Astable Multivibrator (Oscillator)
+ Monostable Multivibator (One-Shot)
o Oscillators
+ Colpitts Oscillator
+ Hartley Oscillator
+ Emitter-Coupled LC Oscillator
o Logic
+ RTL Inverter
+ RTL NAND
+ DTL NAND
+ TTL NAND
+ TTL NOR
+ ECL NOR/OR
* Combinational Logic
o Exclusive OR
o Half Adder
o Full Adder
o 1-of-4 Decoder
o 2-to-1 Mux
o Majority Logic
o 2-Bit Comparator
o 7-Segment LED Decoder
* Sequential Logic
o Flip-Flops
+ SR Flip-Flop
+ Clocked SR Flip-Flop
+ Master-Slave Flip-Flop
+ Edge-Triggered D Flip-Flop
+ JK Flip-Flop
o Counters
+ 4-Bit Ripple Counter
+ 8-Bit Ripple Counter
+ Synchronous Counter
+ Decimal Counter
+ Gray Code Counter
+ Johnson Counter / Decade Counter
o Divide-by-2
o Divide-by-3
o Traffic Light
o Dynamic RAM
* 555 Timer Chip
o 555 Square Wave Generator
o 555 Internals
o 555 Sawtooth Oscillator
o 555 Low-duty-cycle Oscillator
o 555 Monostable Multivibrator
o 555 Pulse Sequencer
o 555 Pulse Width Modulator
o 555 Schmitt Trigger (inverting)
o 555 Missing Pulse Detector
* Transmission Lines
o Simple Transmission Lines
o Standing Wave on a Transmission Line
o Termination of a Transmission Line
o Mismatched transmission lines (Pulse)
o Mismatched transmission lines (Standing Wave)
o Impedance Matching (L-Section)
o Impedance Matching (Shunt Stub)
o Stub Frequency Response
o Low-Pass Filter
o Light Switch
* Memristors
o Memristor
o Memristor Response to Sine Wave
o Memristor Response to Square Wave
o Memristor Response to Triangle Wave
o Memristor Hard-Switching 1
o Memristor Hard-Switching 2
* Tunnel Diodes
o Tunnel Diode I/V Curve
o Tunnel Diode Relaxation Oscillator

[gyula]

Another circuit simulator

Hi Folks,

I also would like to inform you on a simple yet very useful Spice based circuit simulator, also completely free and fully working, you can download and install on you computer, it is not obligatory to sign up for download.

It is LTspice IV from Linear Technology, it includes a Schematics Editor to input your circuits, also has several Examples. Here is the link:
Linear Technology - Design Simulation and Device Models and here you can download: Linear Technology - LTspice IV Downloads and Updates

There is an active yahoo mail group forum for LTspice users where you can get further useful info: LTspice : LTspice/SwitcherCAD III

rgds, Gyula

[sigzidfit]

Super Simple Oscillation

This simulator applet came up in another thread and I thought I'd post an interesting circuit or two.

Instructions:

1. Click "Circuits" and select the blank circuit

2. Click "File" and select "Import"

3. Paste the following into the dialog box and click "Import"

$ 1 5.0E-6 10.20027730826997 50 5.0 50
c 272 192 336 192 0 1.0E-5 6.5076827467707945
c 272 272 336 272 0 1.0E-5 6.507682746770763
l 336 272 336 192 0 1.0 0.015072119332180662
l 272 192 272 272 0 1.0 -0.01507211933218024
w 272 192 272 128 0
w 272 128 400 128 0
w 336 272 336 320 0
w 336 320 400 320 0
v 400 320 400 128 0 0 40.0 5.0 0.0 0.0 0.5
o 8 64 0 35 5.0 0.1 0 -1
o 0 64 0 43 10.0 0.1 1 -1
o 1 64 0 43 10.0 0.1 2 -1

3. Click Reset to begin simulation.

Peace
PJ

[sigzidfit]

OU?

In this simulation a 2 volt LED is lit with 500 millivolts.

$ 1 5.0E-6 10.20027730826997 50 5.0 50
T 352 208 432 272 0 4.0 1.0 -5.202570594451295E-16 -0.002592938633310541 0.999
c 288 272 288 208 0 1.0E-5 -1.3534373141939056
162 288 208 224 208 1 2.1024259 1.0 0.0 0.0
w 224 272 224 208 0
v 352 304 432 304 0 0 40.0 0.5 0.0 0.0 0.5
w 352 304 352 272 0
w 432 304 432 272 0
s 352 160 432 160 0 1 true
w 432 208 432 160 0
w 352 208 352 160 0
w 224 272 288 272 0
d 352 208 288 208 1 0.805904783
w 288 272 352 272 0
c 432 272 432 208 0 1.0E-5 -1.0905931088127356
o 4 64 0 35 5.0 9.765625E-5 0 -1
o 13 64 0 35 20.0 0.00625 1 -1
o 1 64 0 35 2.5 7.8125E-4 2 -1

Start the sim. Press the switch and hold it down and count to five. Release the switch and count to ten.

Peace
PJ

[Michelinho]

Fedora Electronic Lab.

There is also Fedora Electronic Lab.
Welcome to Fedora Electronic Lab

Michel

[sigzidfit]

Hob's Massive OU

5 volts in Quadrillions of Gigawatts out.

$ 1 5.0E-6 10.20027730826997 50 5.0 50
t 400 240 432 240 0 -1 -2.499751241728671 -2.5000000000000004 100.0
w 432 256 480 256 0
w 432 224 464 224 0
t 304 240 256 240 0 1 2.4997512417286707 2.4999999999999996 100.0
w 256 224 256 176 0
w 480 256 480 176 0
w 256 256 256 336 0
w 464 224 464 336 0
w 528 176 480 176 0
w 208 176 256 176 0
c 304 128 384 128 0 9.999999999999999E-6 0.13398337215125444
c 384 192 304 192 0 9.999999999999999E-6 4.843415744066091
l 384 128 384 192 0 1.0 -1.9474501441183013E-5
l 304 128 304 192 0 1.0 0.010381752604973668
v 304 192 384 128 0 0 40.0 5.0 0.0 0.0 0.5
w 304 192 304 208 0
w 304 208 400 208 0
w 384 128 384 96 0
w 384 96 288 96 0
w 288 96 288 224 0
w 288 224 304 224 0
c 160 176 160 128 0 1.0E-5 -5.0692313847293491E18
w 160 128 208 128 0
w 208 176 208 128 0
w 160 176 128 176 0
w 128 176 128 64 0
w 128 64 528 64 0
c 528 64 528 112 0 1.0E-5 -5.0692313847293491E18
w 528 112 528 176 0
w 160 336 160 176 0
w 464 336 352 336 0
w 352 336 256 336 0
w 304 224 304 240 0
w 400 208 400 240 0
w 464 384 464 336 0
w 160 384 160 336 0
r 464 384 160 384 0 100000.0
o 14 64 0 35 10.0 2.0282409603651672E30 0 -1
o 10 64 0 35 20.0 0.025 0 -1
o 11 64 0 35 10.0 7.8125E-4 0 -1
o 12 64 0 35 0.3125 7.8125E-4 0 -1
o 13 64 0 35 10.0 0.025 0 -1
o 36 64 1 35 4.056481920730334E32 9.765625E-5 1 -1

Be sure to get the hard return at the end of the code.

To Infinity and Beyond!
PJ

[thedude]

excellent

Seriously awesome post Slayer.
Everything i've been using my imagination for up until now. :P
Tesla i am not.
Very helpful applet.
Thanks
Thedude

[Naboo]

Hey everybody, since this looks like a place to share great circuit simulators I want you to know about Qucs. I've just began to use it and it is incredible powerful. It works on both Windows and Linux, and Mac as well if I'm not mistaken.

You can download it here:
Qucs project: Quite Universal Circuit Simulator

Edit: I found some pictures of it and also show the successful installation of it on xp (microXp).

Qucs project: screenshots
http://naboo.ws.googlepages.com/XpQucstest.png
http://naboo.ws.googlepages.com/XpQucstest2.png

[tron42]

Joule Thief Circuit

I've been playing with this simulator a lot lately and find it very educational and entertaining. I've found that it doesn't simulate everything I'd like, but it does a fairly good job on the Joule Thief. Try it out for yourself. Be sure to play with the Potentiometer slider to see how it affects the circuit.

$ 1 5.0E-6 20.712724888983452 50 5.0 43
r 432 208 432 272 0 220.0
w 336 224 336 256 0
v 224 288 224 160 0 0 40.0 5.0 0.0 0.0 0.5
T 336 192 368 208 0 0.1 1.0 0.06351305143782035 5.002248615326721E-14 0.999
w 336 160 384 160 0
t 432 272 336 272 0 1 -11.641325227766169 -0.9043331912973003 100.0
w 336 288 224 288 0
v 288 160 288 256 0 0 40.0 5.0 0.0 0.0 0.5
w 288 160 336 160 0
d 336 256 288 256 1 0.805904783
w 224 160 288 160 0
w 336 160 336 192 0
w 384 160 384 224 0
w 384 224 368 224 0
w 368 192 416 192 0
174 416 192 448 208 0 10000.0 0.5099 Resistance
o 5 64 6 35 20.0 9.765625E-5 0 -1
o 2 64 0 35 5.0 0.2 1 -1
o 7 64 0 35 5.0 0.2 2 -1