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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 ST Morpho Connector 144 With STLink ST Morpho Connector 144 STLink AI accelerated MCU with optional wifi, https://dl.sipeed.com/MAIX/HDK/Sipeed-M1&M1W/Specifications AI Kendryte K210 RISC-V Texas Instruments EUS 5 Pin Double Sided Module Texas Instruments HSOP 9, 1.27mm pitch, double rows Through hole angled socket strip SMD 2x16 1.00mm double row surface-mounted straight socket strip, 1x29, 1.27mm pitch, 3.9x4.9mm body, exposed pad, 4x4mm body, pitch 0.5mm (http://www.analog.com/media/en/package-pcb-resources/package/56702234806764cp_24_3.pdf, http://www.analog.com/media/en/technical-documentation/data-sheets/ADL5801.pdf LFCSP VQ, 24 pin, exposed pad: 4.5x8.1mm, (https://www.infineon.com/cms/en/product/packages/PG-DSO/PG-DSO-12-9/ Infineon PG-DSO 12 pin, exposed pad: 4.5x8.1mm, with thermal vias in pads, 4 Pins (http://www.molex.com/pdm_docs/sd/022272021_sd.pdf), generated with kicad-footprint-generator Molex SlimStack Fine-Pitch SMT Board-to-Board Connectors, 502430-0820, 8 Pins (https://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=826576&DocType=Customer+Drawing&DocLang=English), generated with kicad-footprint-generator JST PHD series connector, S12B-EH (http://www.jst-mfg.com/product/pdf/eng/eEH.pdf), generated with kicad-footprint-generator JST XA series connector, B11B-XH-A (http://www.jst-mfg.com/product/pdf/eng/eXH.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py LQFP, 80 Pin (JEDEC MO-153 Var EC https://www.jedec.org/document_search?search_api_views_fulltext=MO-153), generated with kicad-footprint-generator Molex Sabre Power Connector, 43160-1102, With thermal vias in pads, 4 Pins per row (https://cdn.harwin.com/pdfs/M20-781.pdf), generated with kicad-footprint-generator Samtec HLE top entry connector Molex Pico-Clasp series connector, LY20-16P-DT1, 8 Circuits (https://www.molex.com/pdm_docs/sd/2005280080_sd.pdf), generated with kicad-footprint-generator ipc_dfn_qfn_generator.py LFCSP, 20 Pin (JEDEC MO-153 Var ED https://www.jedec.org/document_search?search_api_views_fulltext=MO-153), generated with kicad-footprint-generator JST ZE series connector, B5B-PH-SM4-TB (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 0.5 mm² wires, reinforced insulation, conductor diameter 1.4mm, outer diameter 3.5mm, size source Multi-Contact FLEXI-xV 2.5 (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 Mini-Fit Jr. Power Connectors, 43915-xx12, With thermal vias in pads, 3 Pins per row (http://www.molex.com/pdm_docs/sd/460071105_sd.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py DFN 8 2x2mm, 0.5mm http://www.qorvo.com/products/d/da000896 DFN 0.5 ST 20-Lead Plastic Shrink Small Outline (SM) - 5.28 mm Body [TQFP] (see Microchip Packaging Specification 00000049BS.pdf 48-Lead.

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