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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; 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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Uses your current circuit automatically. JSON upload is optional. Browser-local draft only; nothing is sent.

For review questions. Excluded from the gallery and sharing downloads. In this demo, saved only in this browser.

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Use another JSON file (optional)
Using current circuit.
Local draft terms · 2026-10-12

Save only material you created or may share. You retain your rights. Nothing is sent, received or accepted by the project. If you later submit through a supported route, offer your schematic data and explanation under CC BY-SA 4.0, and any separately identified code under AGPL-3.0-or-later. Identify external sources, licences and AI assistance in the explanation. Facts and standard circuit topologies are not owned by this notice. Use your intended public credit name; private contact email stays out of sharing exports. Read contribution terms.

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.


  
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.