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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 version Alternative: CV from something else VCF MK's Diode Ladder VCF Kassutronic's KS-20 https://kassu2000.blogspot.com/2019/07/ks-20-filter.html ** uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on the footprint. Some options: Bourns PTL series, such as: Update README.md 32ece2d681b26731bad50902587b988d6a79e43e updated README.md 3e868f13c4dc33c20ca33a0cc8f51c9d63e1c081 updated C14 footprint, traces, groundplane updated C14 footprint, traces, groundplane 82024e96c9b263a83b6caf715e8607e9cf1b7d77 updated README.md 83b013c3637bfb179ad62b90a6c8b2f5fb547c8c Update README.md * [Schematic](Docs/precadsr.pdf) * PCB layout.

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