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.
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, or even use Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for MakeCode, CircuitPython, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.
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If you use Linux, take a look at “ktechlab”. Offers Analog & Digital/Logic circuit simulation, and it seems to be able to program PICs with flow diagrams which should be nice for the non-tech people.
Or, just use Spice if you’re interested in correct results. Anyway, this is not really "simulator" – just collection of pretty pictures.
Pretty sure this *is* a simulator. 400+ lines of code in the analyzeCircuit() function (plus more in functions called from it), plus another 100 or so in LU factorization for solving a system of equations. And it looks like at least the Ohm’s law example recalculates currents correctly when you change resistor values. Maybe I missed something, though.
Pretty impressive for how easy it is to use.
Sure spice may be more adaptable but I have to admit it was pretty fun to play with (which is more than I can say about spice…)