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(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 on which are actually 2p6t, which means only six different step counts are available until the replacement arrives - Wiring SW15 (once/stop) and cascade out is easier done via skywiring; only one tl074 and support 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". Shafthole_faces = 20; // How much horizontal space needed for left-hand and right-hand sub-panels left_panel_width = 40; // widest element is rotary, at 30mm right_panel_width = 12; // [1:1:84] /* [Holes] */ hole_dist_top = 2.5; rail_clearance.

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