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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, 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, 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, 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, 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, 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, Reverse Type, Outer Tail, Without Ejector (https://global.kyocera.com/prdct/electro/product/pdf/5638.pdf SD Card Connector, Hinge Type, https://www.molex.com/pdm_docs/sd/472192001_sd.pdf BNC coaxial connector vertical, Amphenol 031-71059, https://www.amphenolrf.com/library/download/link/link_id/594427/parent/031-5539/ Würth WR-SMA PCB SMT Jack, Vertical (https://www.we-online.com/components/products/datasheet/66012102111404.pdf Würth WR-MMCX PCB SMT Jack, Vertical (https://www.we-online.com/components/products/datasheet/66012102111404.pdf Würth WR-MMCX PCB SMT Jack, Vertical (https://www.we-online.com/components/products/datasheet/60312102114405.pdf Coaxial Connector 50 ohms Female Würth WR-MMCX PCB SMT Jack, Vertical (https://www.we-online.com/components/products/datasheet/66012102111404.pdf Würth WR-MMCX PCB SMT Jack, Horizontal (https://www.we-online.com/components/products/datasheet/66011102111302.pdf Jushuo AFC07, FFC/FPC connector, FH12-45S-0.5SH, 45 Pins per row (http://suddendocs.samtec.com/prints/lshm-1xx-xx.x-x-dv-a-x-x-tr-footprint.pdf), generated with kicad-footprint-generator Hirose series connector, B05B-XASK-1-A (http://www.jst-mfg.com/product/pdf/eng/eXA1.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-131-02-xxx-DV-LC, 31 Pins per row (http://www.molex.com/pdm_docs/sd/460071105_sd.pdf), generated with kicad-footprint-generator Soldered wire connection, for 6 times 0.75 mm² wires, reinforced insulation, conductor diameter 0.48mm, outer diameter 2.1mm, see http://cdn-reichelt.de/documents/datenblatt/C151/RND_205-00232_DB_EN.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_WAGO THT Terminal Block Phoenix MKDS-1,5-9-5.08 pitch 5.08mm length 11mm diameter 5mm height 7mm Non-Polar Electrolytic Capacitor C, Disc series, Radial, pin pitch=10.00mm, , length*width=13*3mm^2, Capacitor, http://www.wima.com/EN/WIMA_FKS_3.pdf, http://www.wima.com/EN/WIMA_MKS_4.pdf C Rect series Radial pin pitch 5.08mm size 61x9.8mm^2 drill 1.3mm pad 2.6mm terminal block RND 205-00027 pitch 10mm size 55x10.3mm^2 drill 1.3mm pad 2.5mm terminal block Metz Connect Type171_RT13705HBWC pitch 7.5mm Varistor, diameter 9mm, width 5.7mm, pitch 5mm size 25x8.1mm^2 drill 1.1mm pad 2.1mm terminal block connector http://www.phoenixcontact.com/us/products/1778706/pdf PhoenixContact PTSM0,5 5 HV 2,5mm vertical SMD spring clamp terminal block connector http://www.phoenixcontact.com/us/products/1814702/pdf PhoenixContact PTSM0.5 2 2.5mm vertical SMD spring clamp terminal block.

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