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CAD, attempt at OOTS (but that one 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 | 1N5817 | Schottky diode | Tayda | A-1847 | | Tayda | A-553 | | | Taydaa | A-4755 | | Tayda | A-553 | | | Tayda | A-1672 | | | Tayda | A-3588 | | R9 | 1 | 10R | Resistor | | | | Screws and spacers (see [build notes](build.md | | | | 1 | Conn_01x07 | *(optional) SIP socket.

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