Circuit simulator

Electronic circuit simulator in 15 languages, made for electronics and electricity students and teachers — from technical school to college. Build your circuit with your finger, wire it up and simulate instantly. Works OFFLINE: once installed it needs no internet.

▶ THE SIMULATION COMES ALIVE

CURRENT flows through the wires as particles, the lamp LIGHTS UP with power, the motor SPINS and the speaker PLAYS the signal. You see what happens, not just numbers.

▶ REAL ANALYSIS

• DC: operating point, voltages and currents node by node.

• Transient: oscilloscope with probe, cursors and measurements (Vpp, RMS, frequency, phase shift, cos φ, power factor). Tap any point with the Probe to see its signal, and choose in Settings whether it shows just the trace or every reading.

• Floating ammeter and voltmeter: tap a part, a wire or a point and read it on screen.

• Bode (AC): gain and phase. DC sweep and a live results panel.

▶ NEW: ELECTRICITY COURSE

18 lessons from zero (voltage, current, Ohm's law, series and parallel, power, AC, safety, home wiring), each with animated simulations you can touch, reviews, a final exam and a diploma. Build every lesson circuit in the simulator with one tap.

▶ NEW: JAPAN MODULE (第二種電気工事士)

Read real building wiring plans (図面) with all JIS symbols and furigana, a written-exam mock test (50 questions, 120 minutes, with circuit and wiring-diagram questions) and practice for the practical exam (技能).

▶ ⚡ ELECTRICITY SECTION

18 interactive installation cards, each with a realistic drawing, its diagram and calculators: distribution board, cable sizing and voltage drop, joints, circuit breakers (B, C, D curves, seen from inside), RCDs and their types, earthing and earth rods, earth tester (62 % rule), three-phase load balancing with the neutral current, motor terminal box, star and delta, one-way, two-way and intermediate switches, and wire colours by country (IEC, USA, Japan and more).

▶ NEW: PROGRAMMABLE CHIP (IN DEVELOPMENT)

Write Arduino-style code for a microcontroller and drive a 16×2 LCD and an I²C EEPROM. Plus power-management chips (LDO, buck, Li-ion charger).

▶ POWER ELECTRONICS

SCR, TRIAC and DIAC with phase control (build the real wall DIMMER), IGBT, optocoupler, transformers, a switching power supply (TL431, PWM controller) and a relay with real physics.

▶ 154 COMPONENTS

Resistors, capacitors (polarized too), inductors, diodes, LEDs, Zener, bridge, lamp, heater, fuse, potentiometer, LDR, NTC, motor, relay, buzzer, speakers, displays, battery, DC / sine / PWM / triangle / noise / FM sources, BJT and MOSFET, op-amp, regulator, NE555, audio amplifier and a full digital set with real 74xx chips. Engineering notation (4.7k, 1µ, 4k7).

▶ 160 GUIDED EXAMPLES

Rectifiers, filters, power supplies, amplifiers, 555 timers, dimmer, three-phase line, logic and more — each with its animated schematic and its explanation.

▶ FORMULAS THAT DO THE MATH

24 calculators in the theory sheets (Ohm, dividers, RC, reactance, resonance, LED resistor, 555…), plus 15 more in the Electricity cards. It suggests the nearest real E24/E12 resistor.

▶ MADE FOR LEARNING

• 15 languages: English, Spanish, Portuguese, German, French, Italian, Polish, Russian, Turkish, Hindi, Urdu, Japanese, Chinese, Arabic and Bengali.

• Touch editor: wire pin to pin with two taps, lock the circuit to drag a whole block.

• Warnings that teach: a reversed electrolytic, a part over its limit, a shorted source, a fuse that blows at its rated current.

• Five colour themes, text size and a step-by-step tutorial. Save, export to PNG and share.

▶ LIGHT AND FAST

Runs even on school netbooks and Chromebooks. Its own engine solves with the same methods as a professional simulator.

Free, with a banner ad at the bottom. A single optional purchase removes the ads forever.