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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 ground plane Updates from real TL0x4, fix pots being backwards, tighten up schematic, fit letter instead of latch, https://www.neutrik.com/en/product/nc3fahl1-0 A Series, 3 pole male XLR receptacle, grounding: separate ground contact to mating connector shell and front panel, lateral left PCB mount, https://www.neutrik.com/en/product/nl4md-h speakON Chassis Connectors, 4 pole chassis connector, nickel metal square G-size flange, countersunk thru holes, vertical PCB mount, asymmetric push, https://www.neutrik.com/en/product/nc3fbh2-da B Series, 3 pole female XLR receptacle, grounding: separate ground contact to mating connector shell and front panel, vertical PCB mount, https://www.neutrik.com/en/product/nc5mah A Series, 3 pole male XLR receptacle, grounding: separate ground contact to mating connector shell to pin1 and front panel, vertical PCB mount, https://www.neutrik.com/en/product/nl4md-h-2 speakON Chassis Connectors, 4 pole male XLR receptacle, grounding: separate ground contact to mating connector shell and front panel, steel retention lug, horizontal PCB mount, https://www.neutrik.com/en/product/nl8md-v STX Series, 4 pole male XLR receptacle, grounding: mating connector shell and front panel, vertical PCB mount, https://www.neutrik.com/en/product/nl4md-v speakON Chassis Connectors, 2 pole chassis connector, grey D-size flange, countersunk thru holes, vertical PCB mount, https://www.neutrik.com/en/product/nc5fbh B Series, 3 pole female XLR receptacle, grounding: mating connector shell and front panel, steel retention lug, horizontal PCB mount, https://www.neutrik.com/en/product/nc4fbv A Series, 3 pole XLR female receptacle with 6.35mm (1/4in) stereo jack, switched, gold plated contacts, https://www.neutrik.com/en/product/nmj6hfd2-au M Series, 6.35mm (1/4in) mono jack without switching contact, vertical PCB mount, https://www.neutrik.com/en/product/nc3maav-1 AA Series, 3 pole male XLR receptacle, grounding: mating connector shell to pin1 and front panel, vertical PCB mount, retention spring instead of A4 More cleanup d12ec1f19bbae8f01395e4c76a152d3d4ce7a3d4 Align panel to integer pseudo-origin, remove testing text, decrease title label font size.

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