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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 | 1M | Resistor | | R20, R22 | 2 | 10uF | Electrolytic capacitor | | J3, J4, J5 | 3 | 22k | Resistor | | L1 | 1 | Conn_01x04 | Pin socket, 2.54 mm, 1x4 | | J3 | 1 | SW_Push | Push button switch with two LEDs K switch single-pole double-throw spdt ON-ON horizontal MEC 5G single pole double throw, separate symbols | | Tayda | A-2939 | | J12 | 1 Hardware/lib/aoKicad | 1 README.md | 1 | Synth_power_2x5 | Pin socket, 2.54 mm, 1x10 | | D 2 rotary switch - 9.5mm, +5mm extra space available - mini toggle switch - number of pins: 08; pin pitch: 5.08mm; Vertical; threaded flange || order number: 1847518 8A 320V Generic Phoenix Contact connector footprint for: MSTBVA_2,5/14-G; number of pins: 07; pin pitch: 3.81mm; Angled || order number: 1924428 16A (HC Generic Phoenix Contact connector footprint for: MCV_1,5/13-GF-3.81; number of pins: 08; pin pitch: 3.50mm; Angled || order number: 1847615 8A 320V Generic Phoenix Contact connector footprint for: MSTBV_2,5/16-GF; number of steps (sw11 // step rotary switch - 7mm, with 3-4mm extra space available - mini toggle pushbuttons: ample space above 11.75mm (existing 1p12t rotaries, use 11.25mm holes to PCB edge 11.32mm, see https://disti-assets.s3.amazonaws.com/tonar/files/datasheets/16730.pdf 44-pin D-Sub connector, horizontal/angled (90 deg), THT-mount, female, pitch 2.77x2.84mm, pin-PCB-offset 4.9399999999999995mm, distance of mounting holes 63.5mm, distance of.

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