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BackChip 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 connector 2.54 mm spacing | | | | J3, J4, J5 | 3 | 2N3904 | Small Signal NPN Transistor, TO-92"/>