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Another fairly simple one, using Arduino (nano or uno) + MCP4725 (DAC). ** https://hkadesign.org.uk/monotronkb.html for yet another version Alternative: CV from something else use a raspberry pi zero through hole 3.3mm, height 2.5, Wuerth electronics 9774010943 (https://katalog.we-online.de/em/datasheet/9774010943.pdf), generated with kicad-footprint-generator Molex Mini-Universal MATE-N-LOK, old mpn/engineering number: 1-794105-x, 9 Pins per row (http://suddendocs.samtec.com/prints/lshm-1xx-xx.x-x-dv-a-x-x-tr-footprint.pdf), generated with kicad-footprint-generator connector wire 1sqmm double-strain-relief Soldered wire connection, for 5 times 0.25 mm² wires, reinforced insulation.

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