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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 2.25mm, height 3.5, Wuerth electronics 9774020633 (https://katalog.we-online.com/em/datasheet/9774020633.pdf), generated with kicad-footprint-generator Mounting Hardware, inside through hole M3, height 11.6, Wuerth electronics 9774090360 (https://katalog.we-online.de/em/datasheet/9774090360.pdf), generated with kicad-footprint-generator JST ZE series connector, SM03B-SRSS-TB (http://www.jst-mfg.com/product/pdf/eng/eSH.pdf), generated with kicad-footprint-generator Capacitor SMD 01005 (0402 Metric), square (rectangular) end terminal, IPC_7351 nominal, (Body size from: http://www.kemet.com/Lists/ProductCatalog/Attachments/253/KEM_TC101_STD.pdf), generated with kicad-footprint-generator Harting har-flexicon series connector, B14B-XH-A (http://www.jst-mfg.com/product/pdf/eng/eXH.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-140-02-xxx-DV-LC, 40 Pins (https://www.molex.com/pdm_docs/sd/537480308_sd.pdf), generated with kicad-footprint-generator ipc_plcc_jLead_generator.py PLCC, 68 pins, surface mount common mode bead Coilcraft 0805USB Series Common Mode Choke, https://www.coilcraft.com/pdfs/0603usb.pdf surface mount PLCC, 68 pins, surface mount PLCC, 28 pins, surface mount SMD Kemet EC2 signal relay DPDT double dual coil latching through hole M2, height 3.5, Wuerth electronics 97730456330 (https://katalog.we-online.com/em/datasheet/97730456330.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py QFN, 64 Pin (https://www.ftdichip.com/Support/Documents/DataSheets/ICs/DS_FT2232H.pdf#page=57), generated with kicad-footprint-generator connector Molex KK-396 horizontal Molex SPOX Connector System, 53048-1510, 15 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 JST EH series connector, SM05B-SHLS-TF (http://www.jst-mfg.com/product/pdf/eng/eSHL.pdf), generated with kicad-footprint-generator connector Hirose DF11 through hole, DF13-07P-1.25DS, 7 Pins per row (http://www.molex.com/pdm_docs/sd/530470610_sd.pdf), generated with kicad-footprint-generator JST SH series connector, B2B-EH-A (http://www.jst-mfg.com/product/pdf/eng/eEH.pdf), generated with kicad-footprint-generator Soldered wire connection with feed through strain relief, for 5 times 1.5 mm² wires, basic insulation, conductor diameter 0.9mm, outer diameter 1.5mm, size source Multi-Contact FLEXI-E.

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