Heaviside: Circuit Simulator

Heaviside is a circuit simulator and filter analyzer for students, teachers and engineers. Draw a circuit with your finger and the graphs update instantly. GRAPHS • Bode: magnitude and phase, −3 dB cutoff, resonance • Time: step and impulse response with τ, rise time, overshoot, settling time • Ω: input impedance • Nyquist, Spectrum, Smith chart • Poles and zeros in the s-plane, stability at a glance OSCILLOSCOPE • Signal generators: DC, sine, square, triangle, sawtooth, pulse • Up to 5 channels: voltage or current of any part • Full nonlinear time simulation: rectifiers, transistor switches, dimmers, inverters, DC-DC converters PARTS R, L, C, potentiometer, op-amp, diodes (Si/Ge, Zener, Schottky, LED, varicap), NPN/PNP transistors, MOSFETs, transformer, SCR, triac, diac, switch, voltage and current sources. REAL MODE Every part gets its parasitics: ESR and ESL of capacitors, winding resistance of inductors, gain and GBW of op-amps, junction capacitances of transistors. Ready-made types: BC547, 2N2222, 2N3904, 2N7000, IRF540, BT151, BT136 and more. FORMULAS STEP BY STEP Heaviside derives H(s) and the input impedance for your circuit: nodal equations, simplification, poles, zeros and resonances, with the theory behind each graph. Export everything as a PDF report. MORE • Standard values E6, E12, E24, E96 and tolerance bands • More than 80 examples: filters, op-amp circuits, transistor amplifiers, power electronics, motor drives, DC-DC converters, amplifier classes • Save your circuits on the device • English, Serbian, Spanish, French, German, Chinese PLANS Free forever: examples, building circuits, the Bode graph with its derivation, the scope with 2 channels, up to 5 saved circuits. Try everything with 3 free trials of 10 minutes. Basic and Premium are monthly subscriptions; Pro Lifetime is a one-time purchase.

• Digital logic: gates, flip-flops, 555 timer and 7-segment display, simulated together with analog circuits • Truth tables and Karnaugh maps in the formulas and the PDF • Warnings when a part would be overloaded in a real circuit • 64 new examples: counters, A/D and D/A converters, PLL, AM, FM, PM and digital modulations, inverters, flyback, oscillators, Zobel network and more • Examples sorted into clearer groups