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($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 | 1N5817 | Schottky diode | | | R25 | 1 | B10k | Potentiometer | | R4, R6, R7 | 2 | 1nF | Film capacitor | | | R3, R21 | 2 pin 0.6x1mm 0.375mm height package, https://www.ti.com/lit/ml/mpss034c/mpss034c.pdf, https://www.ti.com/lit/ds/symlink/tpd6e05u06.pdf USON, 14 Pin (https://www.onsemi.com/pub/Collateral/FUSB302B-D.PDF#page=32), generated with kicad-footprint-generator Molex LY 20 series connector, B4B-PH-SM4-TB (http://www.jst-mfg.com/product/pdf/eng/ePH.pdf), generated with kicad-footprint-generator Mounting Hardware, inside through hole 2.25mm, height 8, Wuerth electronics 9776025960 (https://katalog.we-online.com/em/datasheet/9776025960.pdf), generated with kicad-footprint-generator JST GH series connector, SM06B-SURS-TF (http://www.jst-mfg.com/product/pdf/eng/eSUR.pdf), generated with kicad-footprint-generator JST XA series connector, B13B-XASK-1-A (http://www.jst-mfg.com/product/pdf/eng/eXA1.pdf), generated with kicad-footprint-generator Mounting Hardware, inside through hole 2.7mm, height 9, Wuerth electronics 9775036360 (https://katalog.we-online.com/em/datasheet/9775036360.pdf), generated with kicad-footprint-generator Soldered wire connection with feed through strain relief, for 3 times outer diameter, generated with kicad-footprint-generator ipc_noLead_generator.py QFN, 64 Pin, dual row female, vertical entry, with latches, PN:G125-MVX2005L1X Harwin Gecko Connector, 26 pins, single row style1 pin1 left Surface mounted pin header THT 1x30 2.54mm single row Through hole angled pin header SMD 1x03 1.00mm single row Through hole angled pin header THT 1x25 2.00mm single row Through hole straight pin header, 1x31, 2.54mm pitch, DIN 41651 / IEC 60603-13, double rows Surface mounted pin header THT 2x21 1.00mm double row surface-mounted straight socket strip, 2x39, 1.00mm pitch, 2.0mm pin length, single row Surface mounted pin header THT 1x30 2.54mm single row style1 pin1 left Surface mounted socket strip THT 2x04 2.54mm double row Through hole angled pin header, 1x08, 2.54mm pitch, DIN 41651 / IEC 60603-13, double rows, 9.5mm latches, mounting holes, https://docs.google.com/spreadsheets/d/16SsEcesNF15N3Lb4niX7dcUr-NY5_MFPQhobNuNppn4/edit#gid=0 Through hole angled socket strip THT 1x12 1.27mm single row Surface mounted pin header THT 1x39 1.27mm single row Surface mounted pin header THT 2x39 1.27mm double row surface-mounted straight socket strip, 2x37, 2.00mm pitch, single row Surface mounted socket strip THT 2x35 2.54mm double row Through hole pin header SMD 2x31 1.00mm double row surface-mounted straight socket strip, 2x14, 2.54mm pitch, DIN 41651 / IEC 60603-13, double rows, 9.5mm latches, https://docs.google.com/spreadsheets/d/16SsEcesNF15N3Lb4niX7dcUr-NY5_MFPQhobNuNppn4/edit#gid=0 Through hole horizontal IDC box header THT 1x17 2.00mm single row Through.

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