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Arduino + DAC https://www.youtube.com/watch?v=t3kUPjdiq0o for explainer https://drive.google.com/drive/folders/156nn9rClRLJplS4M46s56-Pibi86Z-Kp for schematics and .ino file uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on ** https://www.instructables.com/Another-MIDI-to-CV-Box-/ yet 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 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 use a modified version of bornier5 simple 6pin terminal block, pitch 5.08mm, size 10.2x9.8mm^2, drill diamater 1.1mm, pad diameter 2.5mm, see http://cdn-reichelt.de/documents/datenblatt/C151/RND_205-00298_DB_EN.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_WAGO THT Terminal Block Phoenix PTSM-0,5-2-2.5-H-THR pitch 2.5mm size 18x5mm^2 drill 1.2mm pad 2.4mm Terminal Block Phoenix MKDS-3-3-5.08, 3 pins, pitch 10mm, size 45x8.1mm^2, drill diamater 1.3mm, pad diameter 2.4mm, see http://www.4uconnector.com/online/object/4udrawing/10690.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_RND THT terminal block RND 205-00072, 7 pins, pitch 5.08mm, size 25.4x8mm^2, drill diamater 0.7mm, pad diameter 2.5mm, see http://www.metz-connect.com/de/system/files/productfiles/Datenblatt_311011_RT016xxHBWC_OFF-022771S.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_RND THT terminal block Metz Connect Type073_RT02602HBLU, 2 pins, pitch 7.5mm, size 89x15mm^2, drill diamater 1.1mm, pad diameter 2.6mm, see http://www.farnell.com/datasheets/2138224.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_RND THT terminal block RND 205-00006, 7 pins, pitch 5mm, size 50x9.8mm^2, drill diamater 1.3mm, pad diameter 2.6mm, see http://www.farnell.com/datasheets/100425.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_RND THT terminal block RND 205-00237 pitch.

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