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Kassutronic's KS-20 VCA MK's VCA Probably a straightforward build: one op-amp, four transistors and some example modules Envelope/Envelope.kicad_pcb | 2 | 1nF | Film capacitor | | | | S1 | 1 | 2_pin_Molex_header | 2 | 4.7k | Resistor | | | | J2 | 1 | LM358 | Low-Power, Dual Operational Amplifiers, DIP-14/SOIC-14 | | | | | | Tayda | A-827 | | | R25, R27, R29 | 3 | A1M | Potentiometer | | J2 | 1 | SW_3PDT_x3 | Switch, single pole normally-open illuminated tactile switch SPST right angle, http://www.ckswitches.com/media/1422/js.pdf CuK miniature slide switch, EG series.

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