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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 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 use a 3.5mm drill bit to get proper hole sizes threeUHeight = 133.35; //overall 3u height panelOuterHeight =128.5; panelInnerHeight = 110; // rail clearance = ~11.675mm, top and bottom railHeight = (threeUHeight-panelOuterHeight)/2; mountSurfaceHeight = (panelOuterHeight-panelInnerHeight-railHeight*2)/2; panelInnerOffset = (panelOuterHeight-panelInnerHeight)/2; echo("railHeight: ", railHeight); echo("mountSurfaceHeight",mountSurfaceHeight); offsetToMountHoleCenterY=mountSurfaceHeight/2; offsetToMountHoleCenterX = hp - holeOffset; // 1 to 4.9 milli Ohm (http://http://www.vishay.com/docs/30108/wsk.pdf Shunt Resistor SMD 4020 (10251 Metric), square (rectangular) end terminal, IPC_7351 nominal with elongated pad for handsoldering. (Body size from: http://www.megastar.com/products/fusetronic/polyswitch/PDF/smd2920.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip.

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