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Simple one, using Arduino (nano or uno) + MCP4725 (DAC). ** https://hkadesign.org.uk/monotronkb.html for yet another version Alternative: CV from something else use a 3.5mm drill bit to get proper hole sizes threeUHeight = 133.35; // overall 3u height offsetToMountHoleCenterX=hp;//1hp margin on each copy of this module.

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