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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 4.5mm, height 2, Wuerth electronics 97730356334 (https://katalog.we-online.com/em/datasheet/97730356334.pdf), generated with kicad-footprint-generator Mounting Hardware, inside through hole M3, height 11, Wuerth electronics 9774150960 (https://katalog.we-online.de/em/datasheet/9774150960.pdf,), generated with kicad-footprint-generator Connector Phoenix Contact, SPT 5/3-H-7.5 Terminal Block, 1732522 (https://www.phoenixcontact.com/online/portal/gb/?uri=pxc-oc-itemdetail:pid=1732522), generated with kicad-footprint-generator Molex KK-254 Interconnect System, old/engineering part number: 26-60-4050, 5 Pins per row (http://suddendocs.samtec.com/prints/hle-1xx-02-xx-dv-xe-xx-mkt.pdf, http://suddendocs.samtec.com/prints/hle-thru.pdf), generated with kicad-footprint-generator Hirose series connector, 502386-1370 (http://www.molex.com/pdm_docs/sd/5023860270_sd.pdf), generated with kicad-footprint-generator Molex SlimStack Fine-Pitch SMT Board-to-Board Connectors, 52991-0708, 70 Pins (https://www.molex.com/pdm_docs/sd/537480308_sd.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py TSOP I, 32 pins, 18.4x8mm body (http://www.futurlec.com/Datasheet/Memory/628128.pdf), reverse mount TSOP I 32 reverse TSOP-I, 40 Pin (JEDEC MO-194 Var BB https://www.jedec.org/document_search?search_api_views_fulltext=MO-194), generated with kicad-footprint-generator Molex Mini-Fit Sr. Power Connectors, 42820-52XX, 5 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 ipc_gullwing_generator.py LQFP, 128 Pin (https://www.renesas.com/eu/en/package-image/pdf/outdrawing/q128.14x14.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-113-02-xxx-DV-BE-LC, 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 Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-109-02-xxx-DV-BE, 9 Pins (https://www.molex.com/pdm_docs/sd/026604020_sd.pdf), generated with kicad-footprint-generator Molex PicoBlade series connector, B10P-VH-FB-B, shrouded (http://www.jst-mfg.com/product/pdf/eng/eVH.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-108-02-xxx-DV, 8 Pins per row (https://www.hirose.com/product/document?clcode=&productname=&series=DF11&documenttype=Catalog&lang=en&documentid=D31688_en), generated with kicad-footprint-generator Molex PicoBlade series connector, B10B-EH-A (http://www.jst-mfg.com/product/pdf/eng/eEH.pdf), generated with kicad-footprint-generator Soldered wire connection, for 4 times 1 mm² wires, basic insulation, conductor diameter 0.9mm, outer diameter 3.5mm, size 28.7x7mm^2, drill diamater 1.1mm, pad diameter 2.4mm, outer diameter 3.5mm, size 46.5x8.3mm^2, drill diamater 1.3mm, pad diameter 2.3mm, size source Multi-Contact FLEXI-E 2.5.

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