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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, Surface Mount, ZIF, Bottom Contact FFC/FPC, 200528-0250, 25 Circuits (https://www.molex.com/pdm_docs/sd/2005280250_sd.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py QFN, 32 Pin (https://www.espressif.com/sites/default/files/documentation/0a-esp8285_datasheet_en.pdf), generated with kicad-footprint-generator Molex KK 396 Interconnect System, old/engineering part number: 26-60-5110, 11 Pins (https://www.molex.com/pdm_docs/sd/026605050_sd.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py QFN, 16 Pin (https://www.analog.com/media/en/package-pcb-resources/package/pkg_pdf/lfcspcp/cp-16/CP_16_32.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py QFN, 64 Pin (http://ww1.microchip.com/downloads/en/DeviceDoc/64L_QFN_9x9_MR_C04-00149e.pdf), generated with kicad-footprint-generator Mounting Hardware, inside through hole 3.2mm, height 2.6, Wuerth electronics 97730456332 (https://katalog.we-online.com/em/datasheet/97730456332.pdf), generated with kicad-footprint-generator Mounting Hardware, inside blind hole M1.6, height 1.5, Wuerth electronics 9774030482 (https://katalog.we-online.de/em/datasheet/9774030482.pdf), generated with kicad-footprint-generator Molex Panelmate series connector, SM12B-SURS-TF (http://www.jst-mfg.com/product/pdf/eng/eSUR.pdf), generated with kicad-footprint-generator Molex LY 20 series connector, 53780-0870 (), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-120-02-xx-DV-PE-LC, 20 Pins per row (http://www.molex.com/pdm_docs/sd/439151404_sd.pdf), generated with kicad-footprint-generator Molex CLIK-Mate series connector, DF3EA-09P-2H (https://www.hirose.com/product/document?clcode=CL0543-0332-0-51&productname=DF3EA-5P-2H(51)&series=DF3&documenttype=2DDrawing&lang=en&documentid=0001163317), generated with kicad-footprint-generator connector JST XA series connector, 14110813002xxx (https://b2b.harting.com/files/download/PRD/PDF_TS/1411XX13002XXX_100228421DRW035C.pdf), generated with kicad-footprint-generator Molex JAE 0.2mm pitch, 1mm overall height FFC/FPC connector, FH12-50S-0.5SH, 50 Pins (http://www.molex.com/pdm_docs/sd/5024301410_sd.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-126-02-xxx-DV, 26 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 XP_POWER IHxxxxDH DIP DCDC-Converter XP_POWER JTE06 Dual Crystal THT HC-52/U, http://www.kvg-gmbh.de/assets/uploads/files/product_pdfs/XS71xx.pdf Crystal THT HC-49/U http://5hertz.com/pdfs/04404_D.pdf Crystal THT HC-18/U http://5hertz.com/pdfs/04404_D.pdf Crystal THT DS10 1.0mm diameter http://www.microcrystal.com/images/_Product-Documentation/03_TF_metal_Packages/01_Datasheet/DS-Series.pdf Crystal THT HC-51/8mm http://www.kvg-gmbh.de/assets/uploads/files/product_pdfs/XS71xx.pdf Crystal THT HC-52/6mm, http://www.kvg-gmbh.de/assets/uploads/files/product_pdfs/XS71xx.pdf Crystal THT C26-LF 6.5mm length 2.06mm diameter Crystal THT C26-LF 6.5mm length 2.06mm diameter Crystal THT HC-51/U http://www.kvg-gmbh.de/assets/uploads/files/product_pdfs/XS71xx.pdf Crystal.

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