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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 Latest commits for file LICENSE 9e7b04561b Add ground fills, fix some clearance issues, add PCB slot, more options for potentiometer spoke placement Fix rail clearance issues, add PCB slot, more options for potentiometer spoke placement group "" (id 7cedb386-ca2d-42ef-9568-56fbe1e77165 Period: 6 months 1 day 1 day 1 day Trim 5mm from vertical for both panels, to make fitting inside a case easier. Or 10mm if it faces away and so on. Use transform="matrix(1.000002,0,0,1.000002,-1.047e-5,0.59054561)">

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