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Connection 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 Envelope/Envelope.kicad_pcb | 2 pin Molex header 2.54 mm spacing D 2 pin Molex header 2.54 mm spacing D 3 pin Molex header | | Tayda | A-3545, A-3489, or A-3499.

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