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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 VCF MK's Diode Ladder VCF ~$8 in parts, mostly down to PCB edge 9.12mm, see https://disti-assets.s3.amazonaws.com/tonar/files/datasheets/16730.pdf 9-pin D-Sub connector horizontal angled 90deg THT female pitch 2.77x2.54mm pin-PCB-offset 9.4mm 26-pin D-Sub connector, horizontal/angled (90 deg), THT-mount, male, pitch 2.41x1.98mm, distance of mounting holes 63.5mm, distance of mounting holes to PCB edge 8.2mm, see https://disti-assets.s3.amazonaws.com/tonar/files/datasheets/16730.pdf 15-pin D-Sub connector horizontal angled 90deg THT male pitch 2.77x2.84mm pin-PCB-offset 9.4mm 37-pin D-Sub connector horizontal angled 90deg THT female pitch 2.77x2.84mm mounting holes to PCB edge 15.979999999999999mm, see https://disti-assets.s3.amazonaws.com/tonar/files/datasheets/16730.pdf 15-pin D-Sub connector, horizontal/angled (90 deg), THT-mount, female, pitch 2.77x2.84mm, pin-PCB-offset 4.9399999999999995mm, distance of mounting holes 63.5mm, distance of mounting holes to PCB edge 7.4799999999999995mm, see https://disti-assets.s3.amazonaws.com/tonar/files/datasheets/16730.pdf 37-pin D-Sub connector horizontal angled 90deg THT male pitch 2.29x1.98mm pin-PCB-offset 8.35mm mounting-holes-distance 47.1mm mounting-hole-offset 47.1mm 25-pin D-Sub connector horizontal angled 90deg THT male pitch 2.77x2.84mm pin-PCB-offset 9.4mm 9-pin D-Sub connector, horizontal/angled (90 deg), THT-mount, male, pitch 2.29x1.98mm, pin-PCB-offset 8.35mm, distance of mounting holes to PCB edge 7.4799999999999995mm, see https://disti-assets.s3.amazonaws.com/tonar/files/datasheets/16730.pdf 26-pin D-Sub connector horizontal angled 90deg THT female pitch 2.29x1.98mm pin-PCB-offset 8.35mm mounting-holes-distance 47.1mm mounting-hole-offset 47.1mm 25-pin D-Sub connector, horizontal/angled (90 deg), THT-mount, male, pitch 2.77x2.84mm, pin-PCB-offset 14.56mm, distance of mounting holes with circular drills, http://www.alps.com/prod/info/E/HTML/Encoder/Incremental/EC11/EC11E15204A3.html Alps rotary encoder, EC12E... With switch, vertical shaft, https://www.bourns.com/docs/product-datasheets/pec12r.pdf Bourns rotary encoder, PEC09, with switch, https://www.cui.com/product/resource/sj1-353xng.pdf TRS 3.5mm, vertical, Thonkiconn, PCB mount, http://cherryamericas.com/wp-content/uploads/2014/12/mx_cat.pdf Cherry MX keyswitch 2.75u PCB Cherry MX keyswitch, ISO Enter, plate mount, http://cherryamericas.com/wp-content/uploads/2014/12/mx_cat.pdf Cherry MX keyswitch 2.25u plate Cherry MX keyswitch, 1.75u, PCB mount, asymmetric push, https://www.neutrik.com/en/product/nc3fah1-da A Series, 3 pole female XLR receptacle, grounding: mating connector shell and front panel, horizontal PCB mount, retention spring instead of the stem. [mm] stem_radius = 5; // Number of indenting cones. ≥30.

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