Occasionally, I’ll find myself trying to describe how a circuit works, and pencil and paper just won’t cut it. I need to show them not just how the circuit diagram looks, but how the voltage and current flows through the various components. Rather than take the time to build up a complicated SPICE simulation, there’s one tool that is perfect for quick circuit modeling: Paul Falstad’s Circuit Simulator Applet.
In just a few minutes, you can build complicated circuits, and place probe points for virtual oscilloscopes, resulting in an easy to understand visual diagram that shows voltage and current flow through the circuit. While there are other applications that do the same thing (such as SPICE, Qucs, or TINA), this one runs on Javascript in the browser, and it’s extremely easy to use.
http://makezine.com/2015/07/14/design-circuits-web-based-circuit-simulator/
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