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Free SPICE Simulator Online — Analog Circuits in the Browser

Sensbench runs 23 SPICE analog circuits in the browser: voltage dividers, RC filters, transistor switches, op-amp stages, rectifiers and regulators — each with a working Arduino sketch reading the result. Watch the exponential charge curve, see the 0.7 V diode drop, and turn pots live while the ADC reports what the circuit actually does.

What you get

• 23 ready-to-run SPICE circuits — dividers, filters, bridges, transistors, op-amps, diodes, regulators
• Arduino ADC reads the circuit — every circuit pairs with a sketch measuring it on A0, exactly like a bench setup
• Live component interaction — turn pots, change values, watch voltages follow the math
• Transistor and op-amp models — NPN/PNP switching, Darlington gain, LM358 inverting, follower, comparator, Schmitt trigger
• Power-supply circuits — 7805 and LM317 regulation, zener clamping, reverse-polarity protection

Supported targets

Arduino Uno + SPICE	arduino:avr:uno
Voltage dividers	R1/R2 networks
RC filters	10k + 10uF
Transistors	2N2222 / 2N3906 / 2N7000
Op-amps	LM358
Regulators	7805 / LM317 / zener

Try these examples

FAQ

Is this a full SPICE engine?

It is a SPICE-class analog engine covering passive, transistor, diode and op-amp circuits — accurate enough to teach the real behaviors: exponential charging, forward drops, clipping, hysteresis. It is not a full Spice 3 syntax engine; you build by wiring on the canvas, not by netlist.

Can I build my own SPICE circuit from scratch?

The editor starts from the 23 example circuits, which you can modify — swap resistor values, rewire, add parts. Custom netlist entry is not exposed; the workflow is modify-and-run, which keeps every circuit instantly runnable.