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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 modified version of NL4MD-V with 8 vertical PCB mount, retention spring instead of latch, https://www.neutrik.com/en/product/nc3fah2-0 A Series, 4 pole chassis connector, black D-size flange, self tapping screw holes (A-screw), horizontal PCB mount, retention spring instead of latch, https://www.neutrik.com/en/product/nc3fav-0 A Series, 3 pole female XLR receptacle, grounding: ground contact to mating connector shell and front panel, horizontal PCB mount, https://www.neutrik.com/en/product/nc4fah A Series, 3 pole male XLR receptacle, grounding: mating connector shell and front panel, horizontal PCB mount, black chrome shell, https://www.neutrik.com/en/product/nc5fbh-b B Series, 5 pole female XLR receptacle, grounding: separate ground contact to mating connector shell to pin1 and front panel, lateral right PCB mount, http://cherryamericas.com/wp-content/uploads/2014/12/mx_cat.pdf Cherry MX keyswitch, 1.25u, PCB mount, https://www.neutrik.com/en/product/ncj9fi-h-0 Combo I series, 3 pole XLR female receptacle with 6.35mm (1/4in) mono jack, switched, with chrome ferrule and straight PCB pins, https://www.neutrik.com/en/product/nmj6hhd2 Slim Jacks, 6.35mm (1/4in) switching stereo jack, switched, fully threaded nose, https://www.neutrik.com/en/product/nsj12hf-1 Stacking Jacks, Stereo dual jack, full nose, https://www.neutrik.com/en/product/nsj12hc Stacking Jacks, Stereo dual jack, quick fix nose, https://www.neutrik.com/en/product/nsj8hl Stacking Jacks, Mono dual jack, half threaded nose, https://www.neutrik.com/en/product/nsj12hh-1 Stacking Jacks, Mono dual jack, full nose, https://www.neutrik.com/en/product/nsj12hc Stacking Jacks, Mono dual jack, full nose, https://www.neutrik.com/en/product/nsj12hc Stacking Jacks, Stereo dual jack, full nose, https://www.neutrik.com/en/product/nsj12hc Stacking Jacks, Stereo dual jack, full nose, https://www.neutrik.com/en/product/nsj12hc Stacking Jacks, Mono dual jack, quick fix nose, https://www.neutrik.com/en/product/nsj12hl Combo I series, 3 pole female XLR receptacle, grounding: mating connector shell to pin1 and front panel: mini toggle: ample space above 11.75mm (existing 1p12t rotaries, use 11.25mm holes to PCB edge 11.32mm, see https://disti-assets.s3.amazonaws.com/tonar/files/datasheets/16730.pdf 44-pin D-Sub connector, horizontal/angled (90 deg), THT-mount, female.

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