Quadraphone

Maker	Mountjoy Modular
Type	Four voice polyphonic analog VCO based on the SSI2131
Mounting	SMD
Width	12 HP
License	Proprietary (No hardware licence published)
Difficulty	🌋 Fine-pitch SMD

Square, triangle and saw switched by 74LV4066 analog switches. Pitch, sync and FM all arrive on RJ-45, with per voice trimmers for base frequency, scaling and high frequency tracking.

Documentation

• 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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