Circuit Circuit

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Editing

Pick a part in the Builder, then click the canvas to place it (R rotates, Esc cancels). Choose Connect, click to start a pipe and click again to finish. Circles along pipes create branches; nearby terminals snap. Red rings mark loose ends. Drag empty space to pan. Drag a part to move it with its pipes; Shift-drag detaches it. Drop a loose two-terminal part onto a highlighted pipe to insert it in series. Crossings do not connect.

Click a switch body to toggle it. A diode is a swing check valve that only opens with forward flow. Click a part or pipe to probe its voltage and current.

What the simulation assumes

Ripple defaults to verified steady state; advanced Transients starts from zero stored energy. Educational switched RLC solver (backward Euler), not SPICE: DC and sine supplies, resistors, capacitors, inductors, 2–4 coupled windings (k = 1 by default), PWM switches and up to eight diodes (forward drop + 0.01 Ω, no reverse current or recovery). Wires are ideal. Leakage mode includes an inspectable primary RC snubber for recognized flyback and forward circuits. Saturation and reverse recovery are not modeled. Floating nodes and interrupted inductor current are reported rather than hidden.

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Simulation setup

Model fidelity

Simulation Device losses Course reference overlay

Transients / Leakage · advanced

Ripple shows four verified steady-state cycles with finite L/C ripple. Settling extends the solve within a fixed budget; failure is reported. Ideal keeps the existing course reductions or ideal-component dynamics.

Transients · startup from zero energy

Transients includes startup and switch-cycle ripple. Leakage independently adds finite magnetic coupling and an inspectable primary RC snubber, validated only for recognized flyback and reset-forward. Unavailable circuits keep this control disabled.

Leakage coupling k Snubber C (µF) Snubber R (Ω) Minimum steps

Inspect effective circuit JSON

Ideal devices means zero diode drop/on resistance and zero switch on resistance. The source feed and snubber resistor remain explicit losses. Configured losses retains editable conduction parameters, including 0.01 Ω diode resistance by default. No recovery, avalanche, saturation or nonlinear Coss model.

Simulation appearance

Pressure view Color scale Contrast 2.5× Color reference Visual travel

Speed Loop 0.1×

Experimental circuit import

Preview an RLC circuit with constant voltage supplies before replacing the current circuit.

Supported formats and export instructions

LTspice: View → SPICE Netlist; save UTF-8 .cir/.net/.sp or paste text. Supports R, L, C, constant V and one uniform K group per 2–4 windings.

KiCad: File → Export → Netlist → KiCad (.net), or kicad-cli sch export netlist --format kicadsexpr. Supports standard Device R/R_Small, C/C_Small/C_Polarized/CP/CP1, L/L_Small and Battery/Battery_Cell, pins 1 and 2. Use a literal voltage for the battery and one net named GND, 0, /GND or /0.

Direct .kicad_sch, .asc, XML, semiconductors, models, expressions, controlled/time-varying sources and initial conditions are unsupported. No device is silently skipped or substituted.

Format Netlist text (UTF-8, up to 1 MB; 24 electrical parts)

Experimental educational simulation: ideal linear parts and wires, zero stored energy at startup, backward Euler. This is not full SPICE compatibility or trace replay. General Ideal retains network dynamics; automatic Leakage protection is unavailable.