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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://www.hirose.com/product/en/download_file/key_name/DM3AT-SF-PEJM5/category/Drawing%20(2D)/doc_file_id/44099/?file_category_id=6&item_id=06090031000&is_series= Micro SD, SMD, right-angle, push-pull (https://www.hirose.com/product/en/download_file/key_name/DM3BT-DSF-PEJS/category/Drawing%20(2D)/doc_file_id/44097/?file_category_id=6&item_id=06090029900&is_series= Micro SD, SMD, right-angle, push-pull (https://www.hirose.com/product/en/download_file/key_name/DM3AT-SF-PEJM5/category/Drawing%20(2D)/doc_file_id/44099/?file_category_id=6&item_id=06090031000&is_series= Micro 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, Push-Pull Type, 1.42mm Height, with Detect Switch (https://www.molex.com/pdm_docs/sd/1040310811_sd.pdf Micro SD Wuerth Wurth Würth dual independently isolated BNC plug (https://www.amphenolrf.com/downloads/dl/file/id/2980/product/644/031_6575_customer_drawing.pdf Dual BNC Amphenol Horizontal Panel-mountable BNC connector mounted through PCB, vertical BNC RF interface bayonet 50ohm BNC female PCB mount (https://www.amphenolltw.com/2012download/2D%20PDF/03_M%20Series%20Sensor%20Connectors/M8S-XXPMMR-SF8001.pdf 3.5 mm, Stereo, Right Angle, Surface Mount, ZIF, Bottom Contact FFC/FPC, 200528-0080, 8 Circuits (http://www.jae.com/z-en/pdf_download_exec.cfm?param=SJ103130.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py 14-Lead Plastic Thin Quad Flat, No Lead Package .

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