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It used to be a Java applet, now rewritten in JavaScript. Sadly, the Java version vastly outperforms the JS one, at least on my machine, but Java applets are annoying to run nowadays

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The JS one is plenty performant on my machine. I love that simulator. Helps me intuitively understand the circuit when I can see the voltage and current on each connection.

I do love that you can double click on a wire and check the box to show the current/voltage there.

Try my electron wrapper:

https://github.com/Immortalin/Simulacra

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