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+ MCP4725 (DAC). ** https://hkadesign.org.uk/monotronkb.html for yet 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 modified version of bornier3 simple 4-pin terminal block, pitch 5.08mm, revamped version of bornier5 simple 6pin terminal block, pitch 5.08mm, size 35.6x9.8mm^2, drill diamater 1.3mm, pad diameter 2.4mm, see http://www.4uconnector.com/online/object/4udrawing/20223.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_Phoenix THT Terminal Block Phoenix PT-1,5-7-5.0-H pitch 5mm size 26.5x15mm^2 drill 1.2mm pad 3mm Terminal Block WAGO 804-116 45Degree pitch 5mm size 81.5x15mm^2 drill 1.2mm pad 3mm Terminal Block TE 1-282834-2 pitch 2.54mm size 25.9x6.2mm^2 drill.