Paul Falstad likes to write Java applets, and he’s created quite an impressive collection. One of the coolest is this one, the Analog Circuit Simulator (pictured). It can graphically simulate all sorts of passive and active networks. You can build your own circuits, or you can check out the pre-made designs (like the Sallen-Key LPF shown).
It’s a lot of fun to play with, and a great way to spend this lazy Sunday.
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