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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 Schematics/OttosIrresistableDance/OttosIrresistableDance.kicad_pcb b0f8ee4ade Go to file f6c7924538 Messing around with panel title fonts Untested hardware and software — Do not connect the Normal pin for op amp in.

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