JavaScript Circuit Simulator

The original is here: http://falstad.com/circuit

He already swapped out the old java version with this same javascript (GWT-based) one.

There are several other good simulations on that site, too, and many other good animated physics simulations here: http://phet.colorado.edu/

And for those asking what's the use - there's a lot of research on the PHET simulations about their benefits for learning. I myself used Falstad's simulation in my dissertation. Students who just finished their first circuits course used this sim and learned stuff in minutes that they hadn't learned all semester, like what happens when you add a capacitor to a DC circuit, or the difference between capacitors and inductors in an AC circuit, and the effects of changing capacitance, inductance, and resistance in a circuit. In a regular circuits class, you can get by with just memorizing equations, but this simulation helps you understand what the equations mean and what is actually happening in the circuits you learn about.

There is a nice digital logic simulator called TKGate (http://www.tkgate.org/) which is good for learning. Not web based however.

I've used Paul Falstad's Java circuit simulator a lot. This is a very good port of it. Pretty cool.

Very cool. Check out http://CircuitLab.com too

Check out http://circuits.io

To be honest, I prefer the original java version over the html5 version. It uses less resources, and doesn't cause my browser to crawl while it's running. The java version starts chugging on my laptop at about 20 transistors, this chugs with a third that many. Also, the java version had a zip file you could download to use it without being connected to the internet, which this one doesn't.

Here's a breadboard simulation in Javascript:

http://concord-consortium.github.io/breadboard/build-a-circu...

It's currently much simpler, supporting just resistors, inductors and capacitors, but it's very useful for teaching students electronics.

Adding http://www.partsim.com as well

Very nice! I like the visualizations of the current, power, etc.

I was looking at the astable multivibrator, and I'm just wondering why the transistors turn "red" when there is no current flowing through them (when the visualize-power option is on).

This is not javascript, but Java using the GWT.

Can somebody explain why this is valuable? I'm not sure I understand why you would want to visualize a simple current flow through circuits in a webpage rather than a static display showing expected current flow?

I'm not used to building circuits, and don't want to be the guy saying "who cares", I'm truly trying to understand the value.

Does anyone know if this sort of simulations are still based on a Modified Nodal Analysis?

As someone learning first principles, this is great stuff and super helpful!

Porting something and adding ads is not cool.