CircuitJS (Falstad)
falstad.com/circuit/circuitjs.htmlDiscontinued United States Paul Falstad
Introduction
CircuitJS (aka Falstad Simulator) is a classic interactive online circuit simulator. Famous for its unique visualization of current flow, allowing users to intuitively see voltage and current changes in real-time. It supports analog, digital, and filter circuits with dozens of components and includes many built-in example circuits. Implemented in pure HTML5/JavaScript without Java plugins, it is cross-platform, fast-loading, and one of the most popular teaching demonstration tools worldwide.
Features
- Visualized current/voltage flow
- Real-time dynamic waveform display
- Dozens of basic & advanced components
- Built-in rich example circuits
- Pure HTML5 web implementation
- Globally renowned teaching tool