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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 | 1N5817 | Schottky diode | | | | | Tayda | A-1531 or A-557 | | | | C3, C4, C5 | 3 | 10uF | Electrolytic capacitor | | | | Tayda | A-2939 | | | Tayda | A-1672 | | R14 | 1 | Conn_01x04 | Pin header 2.54 mm spacing Pin header 2.54 mm spacing | | | J11 | 1 nF | Unpolarized capacitor | | | D1, D2, D3, D4, D5, D6, D7, D8, D9, D10 Standard switching diode, DO-35 2x5 pin shrouded header 2.54 mm spacing.

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