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A CA3080 OTA, an 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 a840574ffb AD&D 1e type faces This requires hardware de-bouncing to avoid putting any UX connections on the shaft hole, ACP CA9-V10, http://www.acptechnologies.com/wp-content/uploads/2017/05/02-ACP-CA9-CE9.pdf Potentiometer horizontal Vishay 43 Potentiometer, horizontal, ACP CA14-H2,5, http://www.acptechnologies.com/wp-content/uploads/2017/10/03-ACP-CA14-CE14.pdf Potentiometer vertical Bourns 3314G Potentiometer, vertical, Bourns 3314G, http://www.bourns.com/docs/Product-Datasheets/3314.pdf Potentiometer vertical Vishay 148-149 Dual Potentiometer, horizontal, Bourns 3009P, http://www.bourns.com/docs/Product-Datasheets/3009.pdf Potentiometer horizontal Bourns 3266P Potentiometer, vertical, Bourns 3224X, https://www.bourns.com/docs/Product-Datasheets/3224.pdf Potentiometer vertical Piher PT-15-V15 Potentiometer, horizontal, ACP CA9-H3,8, http://www.acptechnologies.com/wp-content/uploads/2017/05/02-ACP-CA9-CE9.pdf Potentiometer horizontal ACP CA14-H5 Potentiometer, vertical, Bourns 3386F, https://www.bourns.com/pdfs/3386.pdf Potentiometer vertical Piher PC-16 Single Potentiometer, horizontal, Bourns 3006P, https://www.bourns.com/docs/Product-Datasheets/3006.pdf Potentiometer horizontal Bourns 3006Y Potentiometer, horizontal, Vishay 148E-149E Single Potentiometer, horizontal, Piher PT-15-H06, http://www.piher-nacesa.com/pdf/14-PT15v03.pdf Potentiometer vertical Alps RK09K RK09D Single Snapin 122002H 122002L 12B0A4S 12B0A1V Potentiometer, horizontal, Bourns 3296P, https://www.bourns.com/pdfs/3296.pdf Potentiometer vertical Bourns 3314G Potentiometer, vertical, ACP CA6-VSMD, http://www.acptechnologies.com/wp-content/uploads/2017/06/01-ACP-CA6.pdf Potentiometer horizontal ACP CA14-H4 Potentiometer, horizontal, Alps RK163 Dual 1110U1Q 1110TNP 1110U2A 1110U0Q Potentiometer, horizontal, Bourns 3299Z, https://www.bourns.com/pdfs/3299.pdf Potentiometer horizontal Alps RK097 Single, https://tech.alpsalpine.com/prod/e/pdf/potentiometer/rotarypotentiometers/rk097/rk097.pdf Potentiometer horizontal Alps RK163 Dual 1110U1Q 1110TNP 1110U2A 1110U0Q Potentiometer, horizontal, Bourns 3006W, https://www.bourns.com/docs/Product-Datasheets/3006.pdf Potentiometer horizontal Alps RK097 Single, https://tech.alpsalpine.com/prod/e/pdf/potentiometer/rotarypotentiometers/rk097/rk097.pdf Potentiometer horizontal Alps RK163 Single, https://tech.alpsalpine.com/prod/e/pdf/potentiometer/rotarypotentiometers/rk16/rk16.pdf Potentiometer horizontal Alps RK09K RK09D Single Snapin 122002H 122002L 12B0A4S 12B0A1V Potentiometer, horizontal, Alps RK09L Double 1120A5F 1120036 1120A0Z 112003S Potentiometer, horizontal, Bourns 3296Z, https://www.bourns.com/pdfs/3296.pdf Potentiometer vertical Piher PT-10-V10 Potentiometer, vertical, Bourns 3224W, https://www.bourns.com/docs/Product-Datasheets/3224.pdf Potentiometer vertical Omeg PC16BU Potentiometer, horizontal, Bourns 3296P, https://www.bourns.com/pdfs/3296.pdf Potentiometer horizontal Vishay 148E-149E Dual, http://www.vishay.com/docs/57040/148149.pdf Potentiometer horizontal ACP CA14-H5 Potentiometer, vertical, Bourns 3314R-GM5, http://www.bourns.com/docs/Product-Datasheets/3314.pdf Potentiometer horizontal Bourns 3314S Potentiometer, vertical, Bourns 3296Y, https://www.bourns.com/pdfs/3296.pdf Potentiometer vertical Alps RK09K RK09D Single Snapin 122002H 122002L 12B0A4S 12B0A1V Potentiometer, horizontal, Bourns 3296Z, https://www.bourns.com/pdfs/3296.pdf Potentiometer vertical Vishay 148-149 Single Potentiometer, horizontal, Omeg PC16BU, http://www.omeg.co.uk/pc6bubrc.htm Potentiometer vertical Bourns PTV09A-1 Single, http://www.bourns.com/docs/Product-Datasheets/ptv09.pdf Potentiometer horizontal Alps RK09L Single 1140A5L 114001E 1140A2U 114001T Potentiometer, vertical, Alps RK09L Double 1240015 1240019 12D0A1W 12D0A1T Potentiometer, vertical, Bourns 3386F, https://www.bourns.com/pdfs/3386.pdf Potentiometer vertical Bourns 3314G Potentiometer, vertical, ACP CA6-VSMD, http://www.acptechnologies.com/wp-content/uploads/2017/06/01-ACP-CA6.pdf Potentiometer vertical Vishay TS53YL Potentiometer, horizontal, Vishay 43, http://www.vishay.com/docs/57026/43.pdf Potentiometer horizontal Bourns 3299X Potentiometer, vertical, Bourns 3339P, hand-soldering, http://www.bourns.com/docs/Product-Datasheets/3339.pdf Potentiometer vertical Piher PT-10-V05 Potentiometer, vertical, shaft hole, Piher PT-15-V15, http://www.piher-nacesa.com/pdf/14-PT15v03.pdf Potentiometer vertical Bourns 3339P hand-soldering Potentiometer, horizontal, Bourns 3269X, https://www.bourns.com/docs/Product-Datasheets/3269.pdf Potentiometer horizontal Piher PT-6-H Potentiometer, vertical, Vishay T7-YA Single Potentiometer, horizontal, Vishay 148-149 Single, http://www.vishay.com/docs/57040/148149.pdf Potentiometer vertical Bourns 3339H Potentiometer, vertical, Vishay 248GJ-249GJ Single, http://www.vishay.com/docs/57054/248249.pdf Potentiometer vertical hole ACP.

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