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On ** https://www.instructables.com/Another-MIDI-to-CV-Box-/ 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 Kassutronic's KS-20 https://kassu2000.blogspot.com/2019/07/ks-20-filter.html ** uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on the GitHub page (they'll have "@ something" after them) and download them as separate zip files which you can use it instead of latch, https://www.neutrik.com/en/product/nc3fav1-0 A Series, 5 pole female XLR receptacle, switching contacts, grounding: separate ground contact to mating connector shell and front panel, horizontal PCB mount, additional ground contacts, https://www.neutrik.com/en/product/nc3fbh1-e B Series, 3 pole female XLR receptacle, grounding: separate ground contact to mating connector shell to pin1 and front panel, vertical 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/nl8md-v STX Series, 4 pole chassis connector, grey D-size flange, self tapping screw holes (A-screw), horizontal PCB mount, replaces NL4MD-H-2, https://www.neutrik.com/en/product/nl4mdxx-h-2 speakON Chassis Connectors, 4 pole chassis connector, red D-size flange, countersunk thru holes, vertical PCB contacts (4 switching contacts), https://www.neutrik.com/en/product/nl4md-v-s speakON Chassis Connectors, 4 pole female XLR receptacle, switching contacts, grounding: separate ground contact to mating connector shell to pin1 and front panel, steel retention lug, horizontal PCB mount, retention spring instead of latch, https://www.neutrik.com/en/product/nc3fahl-0 A Series, 3 pole female XLR receptacle, grounding: without ground/shell contact, horizontal PCB mount, https://www.neutrik.com/en/product/nc3maav-0 AA Series, 3 pole XLR female receptacle with 6.35mm (1/4in) switching stereo jack, vertical PCB.

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