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BackAn 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 | 47k | Resistor | | | | | | | R5, R29 | 3 | 2N3904 | 0.2A Ic, 40V Vce, Small Signal NPN Transistor, TO-92 | | R9, R11, R13 | 3 | 100R | Resistor | | | | | | | J6 | 1 Kosmo_panel | 1 | SW_SPDT | Switch, triple pole double throw, separate symbols K switch normally-open pushbutton push-button D Push button switch, generic, separate symbols, four pins D Momentary Switch, single pole double throw, separate symbols | | | | | J7, J8, J9 | 1 | SW_3PDT_x3 | Switch, single pole normally-open tactile switch https://www.ckswitches.com/media/1973/ksc7.pdf C&K Switches 1P1T SMD PTS125 Series 12mm Tact Switch with High Contact Reliability, Top-actuated Model, without Ground Terminal.
- Normal 0.195084 -0.980787 -1.39475e-05 facet.
- Https://www.onsemi.com/pub/Collateral/457-04.PDF QFN, diode, 3.3x3.3x1mm (https://www.wolfspeed.com/media/downloads/846/C3D1P7060Q.pdf.
- 2x05 IDC header THT 2x32.
- (sw14 h_wall(h=4, l=slider_spacing*10-1, th=1.