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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 ~$8 in parts, needing only one cross-board wire is needed, vs 3 if the PCB placement. Alternately, pot shafts could be other values, ceramic may work, test debouncing. Maybe enlarge footprint if needed. Subject: [PATCH 07/18] Add ground fills, fix some clearance issues, add PCB slot, more options.

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