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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 ~$8 in parts, depending mainly on whether 8+6 pins + hardware fits on shaek board or similar size perf. MiniADSR derived from this URL using size = 200) at: https://www.myfonts.com/collections/quentin-font-urw?tab=individualStyles font_for_title = "Futura XBlk BT:style=Extra Black"; $fn=FN; /* [Panel] */ width = 36; // [1:1:84] /* [Holes] */ hole_dist_top = 2.5; rail_clearance = 8.5; // mm from very top/bottom edge and where it is not possible or desirable.