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Traces larger; MK uses a CA3080 OTA, an expensive and rare chip these days ($3/ea on amazon, maybe fakes) VCA MK's VCA Probably a straightforward build: one op-amp, four transistors and some example modules main 5a4e89eea6 Add position for resistor between coarse and +12V, value Fireball/Fireball.kicad_sch | 48 dd8c61c34f A couple more minor clearance tweaks 9e7b04561b Add ground fills, fix some clearance issues, make all power traces large 8576ad9482 Added input resistor for sync; placed everything on PCB 7f9b624c8e tweaks layout with input from sam.

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