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Maker	Freemodular
Type	Overdrive preamp with 26 dB of gain, diode clipping and tone control
Mounting	Through-hole
Width	4 HP
License	Open source (Hardware CC BY-SA 4.0, software GPL-3.0)
Difficulty	🌡️ Medium through-hole

Brings line level or microphone signals up to Eurorack level, or drives Eurorack audio into distortion.

Documentation

• Assembly instructions
• Bill of materials (BOM)
• Schematic
• Fabrication files (PCBA-ready)

Links

• Source / files on GitHub
• Maker page

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This is a third-party open-source design, listed here as a build reference. Specs are researched from public sources; check the source repo and store for the current BOM, panel, and revision before ordering parts. Corrections welcome.

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