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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 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 a regular polygon. ≥30 means "round, using current quality setting". /* [Top Rounding (optional)] */ // // Whether to create an engraved indicator arrow on the front to indicate direction? Pointer2 = 1; // [0:Flat, 1:Recessed, 2:Dome] // Do you want finger ridges around the top edge. (Other "top rounding *" parameters are only relevant if checked. Enable_top_rounding = false; // Number of faces around the knob? Knurled = 1; //non-printing, barely-visible.

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