Simulate a circuit

Start from a specific question, such as "where is the -3 dB point?" or "does it clip at the largest input?". Simulate only the stage that answers it. For a single RC or a divider, show the formula instead. Always say which models you used.

Setup

KiCad doesn't include the ngspice command-line program. Install it with brew install ngspice or apt install ngspice; on Windows, use the zip from ngspice.sourceforge.io. This skill was tested with ngspice 47.

Run it in batch mode: ngspice -b deck.cir.

1. Get the circuit

K is kicad-cli (see kicad-view).