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Dev board (in some cases) Arduino + DAC https://www.youtube.com/watch?v=t3kUPjdiq0o for explainer https://drive.google.com/drive/folders/156nn9rClRLJplS4M46s56-Pibi86Z-Kp for schematics and .ino file uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on the streets of the License, but not necessary for old fogeys like me to get 1:1 between schematic and front panel, steel retention lug, horizontal PCB mount, retention spring instead of latch, https://www.neutrik.com/en/product/nc3faah2-0 AA Series, 3 pole XLR female receptacle with 6.35mm (1/4in) stereo jack B-gauge type (T/TN/R/RN/S/SN), https://www.neutrik.com/en/product/nj6tb-v M Series, 6.35mm (1/4in) stereo jack, switched, with half threaded nose, sleeve contact/front panel connection, https://www.neutrik.com/en/product/nrj6hf-1-au Slim Jacks, 6.35mm (1/4in) stereo jack, metal nose, efficient chassis ground connection, T+R normalling contact, https://www.neutrik.com/en/product/nrj6hm-1-au Slim Jacks, 6.35mm (1/4in) stereo jack, metal nose with efficient chassis ground connection, T+R normalling contact, https://www.neutrik.com/en/product/nrj6hm-1 Stacking Jacks, Stereo dual jack, full nose, https://www.neutrik.com/en/product/nsj8hc Stacking Jacks, Mono dual jack, full threaded nose and offset PCB pins, https://www.neutrik.com/en/product/nmj4hcd2 M Series, 6.35mm (1/4in) mono jack without switching contact, vertical PCB mount, https://www.neutrik.com/en/product/ncj6fi-v-0 Combo I series, 3 pole female XLR receptacle, grounding: mating connector shell and front panel, horizontal PCB mount, self tapping screw holes (A-screw), vertical PCB mount, http://cherryamericas.com/wp-content/uploads/2014/12/mx_cat.pdf Cherry MX keyswitch, 1.75u, PCB mount, https://www.neutrik.com/en/product/nc3mahl A Series, 4 pole chassis connector, red D-size flange, mirrored self tapping screw holes (A-screw), vertical PCB mount, https://www.neutrik.com/en/product/nc3mah A Series, 3 pole female XLR receptacle, grounding: without ground/shell contact, vertical PCB mount, https://www.neutrik.com/en/product/nc3fahl1 A Series, 4 pole chassis connector, black D-size flange.

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