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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 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, polarization inverse (https://multimedia.3m.com/mws/media/22424O/3mtm-cf-card-header-type-i-low-profile-surface-mount-ts0747.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, top-mount, push-push (https://www.hirose.com/product/document?clcode=CL0609-0004-8-82&productname=DM1AA-SF-PEJ(82)&series=DM1&documenttype=2DDrawing⟨=en&documentid=0000915301 SD Card Connector, Normal Type, Outer Tail, Spring Eject Type (https://global.kyocera.com/prdct/electro/product/pdf/5638.pdf SD Card Connector, Surface Mount, ZIF, 33 Circuits (http://www.molex.com/pdm_docs/sd/5022441530_sd.pdf Molex Molex 1.00mm Pitch Easy-On BackFlip, Right-Angle, Bottom Contact FFC/FPC, 200528-0180, 18 Circuits (https://www.molex.com/pdm_docs/sd/2005280180_sd.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-106-02-xx-DV-TE, 6 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-126-02-xxx-DV-BE, 26 Pins per row (https://www.molex.com/pdm_docs/sd/022057045_sd.pdf), generated with kicad-footprint-generator Capacitor SMD 1210 (3225 Metric), square (rectangular) end terminal, IPC_7351 nominal with elongated pad for handsoldering. (Body size from: https://www.vishay.com/docs/48064/_t58_vmn_pt0471_1601.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py LQFP, 64 Pin (JEDEC MO-153 Var DE https://www.jedec.org/document_search?search_api_views_fulltext=MO-153), generated with kicad-footprint-generator Soldered wire connection with feed through strain relief, for 4 times 1 mm² wires, reinforced insulation, conductor diameter 1.7mm, outer diameter 4.4mm, 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 TE, 1-826576-6, 16 Pins (http://www.molex.com/pdm_docs/sd/022272021_sd.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py Infineon PG-DSO, 8 Pin (http://www.ti.com/lit/ml/mpds400/mpds400.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py UQFN, 10 Pin (http://www.ti.com/lit/ds/symlink/tps7a91.pdf#page=30), generated with kicad-footprint-generator JST PUD series connector, SM08B-SRSS-TB (http://www.jst-mfg.com/product/pdf/eng/eSH.pdf), generated with kicad-footprint-generator JST EH series connector, 53398-0871 (http://www.molex.com/pdm_docs/sd/533980271_sd.pdf.

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