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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 schematic start, and some example modules main 5a4e89eea6 Add position for resistor between coarse and fine pitch, FM level, pulse wave modulation (PWM). Hard controls include coarse and +12V, value Fireball/Fireball.kicad_sch | 4 .../PCB/precadsr_Gerbers/precadsr-F_Mask.gbr .

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