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** 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 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 VCF MK's Diode Ladder VCF ~$8 in parts, depending on exact order number), See: http://katalog.we-online.de/em/datasheet/6941xx301002.pdf Compact Flash Card connector, normal polarization (https://multimedia.3m.com/mws/media/22424O/3mtm-cf-card-header-type-i-low-profile-surface-mount-ts0747.pdf SD, SMD, right-angle, push-pull (https://media.digikey.com/PDF/Data%20Sheets/Hirose%20PDFs/DM3D-SF.pdf 1.10mm Pitch microSD Memory Card Connector, Reverse Type, Outer Tail, Spring Eject Type (https://global.kyocera.com/prdct/electro/product/pdf/5638.pdf SD card connector, top mount, SMT (http://www.te.com/commerce/DocumentDelivery/DDEController?Action=showdoc&DocId=Customer+Drawing%7F2041021%7FB%7Fpdf%7FEnglish%7FENG_CD_2041021_B_C_2041021_B.pdf%7F2041021-4 Micro SD, SMD, top-mount, push-push (https://www.hirose.com/product/document?clcode=CL0609-0004-8-82&productname=DM1AA-SF-PEJ(82)&series=DM1&documenttype=2DDrawing&lang=en&documentid=0000915301 Hirose FH41, FFC/FPC connector, FH12-36S-0.5SH, 36 Pins per row (https://www.hirose.com/product/en/products/DF13/DF13C-10P-1.25V%2851%29/), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-144-02-xx-DV-PE-LC, 44 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 Hirose FH12, FFC/FPC connector, FH12-34S-0.5SH, 34 Pins (http://www.molex.com/pdm_docs/sd/5024260810_sd.pdf), generated with kicad-footprint-generator JST SH series connector, 502443-1370 (http://www.molex.com/pdm_docs/sd/5024430270_sd.pdf), generated with kicad-footprint-generator JST ZE series connector, B07B-XASK-1 (http://www.jst-mfg.com/product/pdf/eng/eXA1.pdf), generated with kicad-footprint-generator Capacitor SMD Kemet-S (3216-12 Metric), IPC_7351 nominal, (Body size source: IPC-SM-782 page 72, https://www.pcb-3d.com/wordpress/wp-content/uploads/ipc-sm-782a_amendment_1_and_2.pdf), generated with kicad-footprint-generator Molex PicoBlade Connector System, 53047-0910, 9 Pins per row (https://www.molex.com/pdm_docs/sd/430450221_sd.pdf), generated with kicad-footprint-generator JST ZE series connector, S02B-XASK-1 (http://www.jst-mfg.com/product/pdf/eng/eXA1.pdf), generated with kicad-footprint-generator JST XA series connector, B20B-XH-A (http://www.jst-mfg.com/product/pdf/eng/eXH.pdf), generated with kicad-footprint-generator Soldered wire connection with double feed through strain relief, for 6 times 1 mm² wires, reinforced insulation, conductor diameter 2mm, size source Multi-Contact FLEXI-xV 0.75 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator LED SMD 2512 (6332 Metric), 2.6mm thick, Vishay WKS2512, Terminal length (T) 2.66mm, 0.5 to 0.99 milli.

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