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Power 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 unknown Align panel to PSU PCB (will affect choice of 9 mm pots, you're on your own! The jacks.

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