Falstad Circuit =link= 100%

You can add sliders to vary values (like resistance) while the simulation is running: Right-click a component ➔ .

There is no installation required. You navigate to the website, and it just works. The interface is a simple schematic capture window. You drag components (resistors, capacitors, LEDs, transistors, logic gates) onto the canvas, connect them with wires, and flip the switch. falstad circuit

A free, browser-based (and downloadable Java/JavaScript) interactive analog/digital circuit simulator. It’s been around for decades, originally in Java, now also runs in a browser via JavaScript/HTML5. You can add sliders to vary values (like