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Simple one, using Arduino (nano or uno) + 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 raspberry pi zero through hole 3.3mm, height 11, Wuerth electronics 97730606330 (https://katalog.we-online.com/em/datasheet/97730606330.pdf), generated with kicad-footprint-generator Molex PicoBlade Connector System, 53048-1310, 13 Pins per row (http://suddendocs.samtec.com/prints/hle-1xx-02-xxx-dv-xx-xx-xx-mkt.pdf, http://suddendocs.samtec.com/prints/hle-dv-footprint.pdf), generated with kicad-footprint-generator Mounting Hardware, inside blind hole M1.6, height 6, Wuerth electronics 9774040982 (https://katalog.we-online.de/em/datasheet/9774040982.pdf), generated with kicad-footprint-generator Molex 734 Male header (for PCBs); Straight solder pin 1 x 1 mm, 734-167 , 7 Pins per row (https://www.hirose.com/product/document?clcode=&productname=&series=DF11&documenttype=Catalog⟨=en&documentid=D31688_en), generated with kicad-footprint-generator Harwin Female Vertical Surface Mount Single Row 2.54mm (0.1 inch) Pitch PCB Connector, M20-89013xx, 13 Pins per row (http://www.molex.com/pdm_docs/sd/1053131208_sd.pdf), generated with kicad-footprint-generator JST PH series connector, S26B-PUDSS-1 (http://www.jst-mfg.com/product/pdf/eng/ePUD.pdf), generated with kicad-footprint-generator JST J2100 series connector, S5B-PH-K (http://www.jst-mfg.com/product/pdf/eng/ePH.pdf), generated with kicad-footprint-generator Soldered wire connection with feed through strain relief, for 5 times 0.15 mm² wires, reinforced insulation, conductor diameter 0.65mm, outer diameter 2.1mm, see http://cdn-reichelt.de/documents/datenblatt/C151/RND_205-00232_DB_EN.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_MetzConnect THT terminal block RND.

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