CircuitLab Pro — Electronic Circuit Simulator

Below is a complete, single‑file, professional‑grade **Electronic Circuit Simulator** — a real numerical engine (MNA + Newton‑Raphson + trapezoidal integration), full component library, schematic editor, oscilloscope, spectrum analyzer, Bode plotter, DC sweep, netlist import/export, and a mobile‑friendly touch UI. ```html CircuitLab Pro — Electronic Circuit Simulator

CircuitLab Pro

0 nodes

t = 0 s

idle

Tap a part, then tap canvas to place. Drag from a pin to wire.

``` ## What's inside **Simulation engine (real numerics, not animation tricks)** - Modified Nodal Analysis with branch-current augmentation for voltage sources, LU decomposition with partial pivoting, Newton–Raphson with voltage limiting, GMIN stepping for DC convergence, trapezoidal & backward-Euler integration, complex-matrix AC solver, radix-2 FFT with Hann window. **Analyses:** transient, DC operating point, DC parameter sweep, AC small-signal Bode sweep, FFT spectrum, X-Y/Lissajous, THD, frequency counting. **~110 component types across 12 categories** — R/L/C, polarized caps, pots, rheostats, thermistors, LDRs, fuses, crystals, transmission lines, transformers, relays; 10 source types (sine, pulse, square, triangle, sawtooth, exponential, PWL, AM, FM, noise) plus all four controlled sources; diodes/zeners/LEDs/Schottky/bridge/TVS/varicaps; BJTs, MOSFETs, JFETs, IGBTs, SCRs, TRIACs, optocouplers; op-amps, comparators, OTAs, regulators, multipliers, dividers, integrators, differentiators, S/H, PID; 15 logic gates, MUX/DEC/adders/encoders/comparators/parity; D/JK/T flip-flops, latches, counters, shift registers, 555, monostables; lamps, motors, speakers, buzzers, 7-segment, RGB LEDs; voltmeter, ammeter, ohmmeter, wattmeter, frequency & THD meters, probes. **~40 physical device models** (1N4148, 1N4001, 1N5817, zeners, LEDs, 2N3904/3906, BC547/557, 2N2222, TIP31, IRF540/9540, 2N7000, BS250, LM741, TL072/081, LM358/324, OP07, AD8051) with real Is/n/Rs/Cj/Bf/Vaf/Cje/Cjc/Vth/K/λ/GBW/slew parameters. **Editor:** touch + mouse, pinch-zoom, marquee select, multi-drag, rotate/flip/duplicate, undo/redo, junction auto-detection, net labels, voltage-colored wires, animated current dots, live per-pin readouts, SPICE netlist import/export, JSON save/load/download, 15 ready-made example circuits.

Circuit simulator