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BackMK 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 | | | R20, R22 | 3 pin Molex header 2.54 mm spacing D 2 rotary switch - 7mm.
- -0.012671 0.705364 0.708732 vertex -7.28282.
- Normal -0.0977941 0.989287 0.108382 facet normal -0.466839 0.877362.
- Normal 3.767562e-15 -4.270920e-15 1.000000e+00 facet.