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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, 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 Card Connector, Surface Mount, ZIF, 15 Circuits (https://www.molex.com/pdm_docs/sd/2005280150_sd.pdf), generated with kicad-footprint-generator JST XH series connector, S03B-ZESK-2D (http://www.jst-mfg.com/product/pdf/eng/eZE.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py TSSOP, 56 Pin (http://intantech.com/files/Intan_RHD2000_series_datasheet.pdf#page=38), generated with kicad-footprint-generator Mounting Hardware, external M3, height 11, Wuerth electronics 9775041360 (https://katalog.we-online.com/em/datasheet/9775041360.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-130-02-xxx-DV-A, 30 Pins (http://www.molex.com/pdm_docs/sd/5024301410_sd.pdf), generated with kicad-footprint-generator Resistor SMD 2512 (6332 Metric), 2.6mm thick, Vishay WKS2512, Terminal length (T) 2.21mm, 1 to something more decisive, like 3x. Then a signal as low as 2v could works as an external clock. One idea: add a switch } else if (two_holes_type .

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