Circuit Simulator

Schematic editor and SPICE engine, fully in-browser

MakersDeck's Circuit Simulator combines a schematic capture editor with a real SPICE simulation engine (ngspice compiled to WebAssembly). Draw a circuit, place probes, and run DC operating-point, AC frequency-sweep, or transient time-domain analysis — all client-side, with no data leaving the browser.

Schematic editor

Drag components from the palette and draw wires with Manhattan routing. The component library includes resistors, capacitors, inductors, voltage and current sources, diodes, BJTs, MOSFETs, and op-amps.

Analysis types

DC operating point — solve node voltages and branch currents at steady state
AC sweep — frequency-domain magnitude and phase response (Bode plot)
Transient — time-domain voltage and current waveforms

Oscilloscope and probes

Place voltage probes across nodes or current probes in series with branches. The integrated oscilloscope displays waveforms for all active probes simultaneously. Traces can be zoomed and compared.