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BackOne 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 schematic start, and some example modules Envelope/Envelope.kicad_pcb | 2 | | | | | | Tayda | A-1605 | | R8, R10, R12 | 3 | 22k | Resistor | | | J11 | 3 | A1M | Potentiometer | | | Tayda | A-804 | | Tayda | A-3588 | | R17, R19 | 3 | 1k | Resistor | | C10 | 1 | LED | Light emitting diode | | | R114 | 1 | AudioJack2_SwitchT | Audio Jack, 2 Poles (Mono / TS), Switched T Pole (Normalling)"/>