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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 non-metal spacer underneath alpha pots: tight, only 1/2 turn for nut 11mm - rotary, SR2511 style, with very large range of in-tune response, but comments discuss potential fixes, maybe worth it for a full bridge rectifier; could use slightly larger spacing - C7 is a few due to referer checks 943ef1409b Fix getting a bunch of wires backwards e6b834b08c Fix floating pin for op amp 54f1a61ba5 gets jiggy with PCB trace layout Checkpoint in case of crashes Fix getting a bunch of wires backwards Fix floating pin for op amp in schmidt inverter mode, maybe both 7808 and hex inverter trigger are unnecessary? Alternative: Midi -> CV Alternative: CV from something else use a raspberry pi zero through hole M1.6, height 3, Wuerth electronics 9775106360 (https://katalog.we-online.com/em/datasheet/9775106360.pdf), generated with kicad-footprint-generator Soldered wire connection with feed through strain relief, for 6 times 2.5 mm² wires, basic insulation, conductor diameter 0.4mm, outer diameter 1mm, size source Multi-Contact FLEXI-2V 0.25 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator Capacitor SMD 0201 (0603 Metric), square (rectangular) end terminal, IPC_7351 nominal, (Body size source: http://www.tortai-tech.com/upload/download/2011102023233369053.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py LFCSP 8pin thermal pad 3x2mm Pitch 0.5mm right angle Würth USB-A two stacked horizontal receptacle, through-hole (https://www.cuidevices.com/product/resource/uj2-adh-th.pdf USB-A CUI stacked horizontal receptacle, through-hole (https://www.cuidevices.com/product/resource/uj2-adh-th.pdf USB-A CUI stacked horizontal receptacle, through-hole (https://www.cuidevices.com/product/resource/uj2-adh-th.pdf USB-A CUI stacked horizontal receptacle, through-hole (https://www.cuidevices.com/product/resource/uj2-adh-th.pdf USB-A CUI stacked horizontal through-hole USB type A Plug, Horizontal, http://cnctech.us/pdfs/1001-011-01101.pdf USB-A receptacle horizontal through-hole USB_B USB B receptacle horizontal through-hole USB type A right angle through hole M3, height 6.6, Wuerth electronics 97730406332 (https://katalog.we-online.com/em/datasheet/97730406332.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py SOP, 16 Pin (https://www.st.com/resource/en/datasheet/tsv521.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-112-02-xxx-DV-BE-LC, 12 Pins per row (https://cdn.harwin.com/pdfs/M20-781.pdf), generated with kicad-footprint-generator JST XA series connector, B7P-VH (http://www.jst-mfg.com/product/pdf/eng/eVH.pdf), generated with kicad-footprint-generator Mounting Hardware, inside through hole 4.5mm, height 10, Wuerth electronics 9774040360 (https://katalog.we-online.de/em/datasheet/9774040360.pdf), generated with kicad-footprint-generator Hirose DF13 through hole, DF11-8DP-2DSA, 4 Pins per row (https://www.hirose.com/product/en/products/DF13/DF13-2P-1.25DSA%2850%29/), generated with kicad-footprint-generator Mounting Hardware, inside through hole M3, height 5.6, Wuerth electronics 9774020982 (https://katalog.we-online.de/em/datasheet/9774020982.pdf), generated with kicad-footprint-generator Resistor SMD 0603 (1608 Metric), square (rectangular) end terminal, IPC_7351 nominal, (Body size source: http://www.tortai-tech.com/upload/download/2011102023233369053.pdf), generated with.

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