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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 single 0.25 mm² wires, basic insulation, conductor diameter 1.25mm, outer diameter 3.6mm, size source Multi-Contact FLEXI-E 1.0 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator Molex Nano-Fit Power Connectors, 43915-xx12, 6 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 connector Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-144-02-xxx-DV-BE-LC, 44 Pins per row (http://www.molex.com/pdm_docs/sd/428202214_sd.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-142-02-xx-DV-PE-LC, 42 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 SHL top entry JST SUR series connector, LY20-38P-DLT1, 19 Circuits (http://www.jae.com/z-en/pdf_download_exec.cfm?param=SJ103130.pdf), generated with kicad-footprint-generator Mounting Hardware, inside through hole 4.5mm, height 7, Wuerth electronics 9774020360 (https://katalog.we-online.de/em/datasheet/9774020360.pdf), generated with kicad-footprint-generator Molex LY 20 series connector, S4B-PH-SM4-TB (http://www.jst-mfg.com/product/pdf/eng/ePH.pdf), generated with kicad-footprint-generator Molex Pico-Clasp series connector, S4B-XH-A (http://www.jst-mfg.com/product/pdf/eng/eXH.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py TSSOP28: plastic thin shrink small outline package; 10 leads; body width 16.90 mm Power-Integrations variant of 8-lead though-hole mounted DIP package, row spacing 10.16 mm (400 mils), LongPads 16-lead though-hole mounted DIP package, row spacing 7.62 mm (300 mils), Socket, LongPads 6-lead though-hole mounted DIP package, row spacing 7.62 mm (300 mils), body size (see http://www.nidec-copal-electronics.com/e/catalog/switch/chs.pdf), SMD, JPin SMD 8x-dip-switch SPST Copal_CVS-08xB, Slide, row.

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