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+ 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 use a 3.5mm drill bit to get 1:1 between schematic and PCB, no warnings Add splits and labels to get proper hole sizes threeUHeight = 133.35; // overall 3u height panelOuterHeight =128.5; panelInnerHeight = 110; // rail clearance issues, make all power traces large tracks the ratsnest and compactifies the power safety block and into any non-high-impedence connections; that is, fat traces.

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