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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 | | | R4, R6, R7, R30, R31 Switch, dual pole double throw | | Tayda | A-3186 | | | | | | J11 | 3 | 1k | Resistor | | U1 | 1 | LM358 | Low-Power, Dual Operational Amplifiers, DIP-14/SOIC-14 Low-Power, Dual Operational Amplifiers, DIP-8/SOIC-8/TO-99-8 | | | | | C1, C11, C12 | 2 | 1M | Resistor | | | | | | | J9 | 1 | LED | Light emitting diode Push button switch, generic, two pins D Push button switch, push-to-open, generic, two pins | Dailywell | PAS7B3M1CESA6-5 | Tayda | A-1955 | | | | | J5, J12, J13 | 3 * https://www.digikey.com/en/products/detail/bourns-inc/PTL30-15R0-103B1/3781301 (red B10K) and https://www.digikey.com/en/products/detail/bourns-inc/PTL30-15O0-105A2/7314942 (orange A1M * The SPDT toggle switches available from Tayda, per their datasheet, appear to differ in height by 3.16 mm. (8.89 mm vs (10.54+1.52) mm if I'm reading it.
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