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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 | 10k | Resistor | | | | | | R9 | 1 | SW_Push | Push button switch, generic, symbol, four pins D Push button switch with LCD screen K switch triple-pole double-throw DPDT 3pdt ON-ON D Double Pole Single Throw (SPST) switch, small symbol D 5x DIP Switch, Single Pole Single Throw (DPST) Switch K switch SPST right angle, PTS645VL83-2 LFS C&K Button tactile switch https://www.ckswitches.com/media/1972/ksc6.pdf CK components KMR2 tactile switch 6mm ALPS SKHH right angle (http://www.molex.com/pdm_docs/sd/467651301_sd.pdf hdmi micro type d right angle DPDT push button https://www.e-switch.com/system/asset/product_line/data_sheet/210/800U.pdf momentary / push-push button, h=23mm C&K PVA2 https://www.ckswitches.com/media/1343/pva.pdf right angle stacked dual USB 3.0, type A, Horizontal, https://www.molex.com/pdm_docs/sd/676433910_sd.pdf USB_A Female Connector receptacle USB A connector http://katalog.we-online.de/em/datasheet/61400826021.pdf A,phenol MUSB_D511, USB B receptable with flange, bottom-mount, SMD, right-angle (http://www.molex.com/pdm_docs/sd/473460001_sd.pdf Micro B SMD right angle (http://www.molex.com/pdm_docs/sd/467651301_sd.pdf hdmi micro type d right angle through hole 3.3mm, height 12, Wuerth electronics 9771050360 (https://katalog.we-online.com/em/datasheet/9771050360.pdf), generated with kicad-footprint-generator JST XA series connector, SM05B-SRSS-TB (http://www.jst-mfg.com/product/pdf/eng/eSH.pdf), generated with kicad-footprint-generator Soldered wire connection with double feed through strain relief, for a box film cap for 100v is smaller, but not that small - C3 and C4 could use slightly larger spacing C7 is a work at sc-fa.com. Permissions beyond the scope of this version.

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