mc9py

Script Micro-Cap 9 from Python. Describe or open a circuit, run analyses, get the numbers, and take screenshots that are MC9's own pictures - with its cursors, cursor tables and voltage boxes. Works on Linux (sandboxed Wine) and Windows.

• Native pictures - plots and schematics are MC9's own pixels. Nothing is re-plotted, so they are exactly what teachers expect.
• Real numbers - every value comes from MC9's numeric output: operating points, AC/transient/DC tables, THD, Rin, Rout.
• Circuits from code - write a SPICE-like netlist and get a placed, routed, label-collision-free schematic.
• Safe by design - on Linux MC9 runs in a bubblewrap sandbox with no network and no access to your files.
• AI-ready - a built-in MCP server lets an assistant build, simulate and photograph circuits for you.

import mc9
from mc9 import measure

c = mc9.library.ce_amplifier().build("amp")              # a common-emitter stage, drawn automatically
print(c.op()["Q1"]["IC"])                                 # 7.089e-03  (A)
bw = measure.bandwidth(c, "db(v(ua)/v(ue))", cursors=True)   # -3 dB band; MC9's cursors on the edges
c.shot("response.png")                                    # MC9's own plot with its cursor table

Gallery

Everything below was produced by scripts - the circuits were placed automatically and every picture is a screenshot of MC9.

Where to go

• New here? Install and run the quickstart.
• Doing a lab? Analyses -> Cursors and screenshots -> Measurements.
• Drawing circuits? Automatic placement or the Schematic builder.
• Curious how it works? Architecture.

Support matrix

	Linux	Windows
Backend	Wine + Xvfb + bubblewrap sandbox	native, Win32 API
Tested	real MC9 (Russian GUAP 9.0.3)	Windows Python under Wine driving MC9; real-Windows reports welcome
UI language	calibrated for the Russian edition, other editions need a calibration	independent
Python	3.10 - 3.14	3.10 - 3.14

Micro-Cap is a trademark of Spectrum Software. This project is independent, contains no MC9 code and needs your own licensed copy.