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The full 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 Gate In jack and switching ground contact, vertical PCB mount, https://www.neutrik.com/en/product/nc3mbv A Series, 3 pole female XLR receptacle, grounding: separate ground contact to mating connector shell and front panel, horizontal PCB mount, asymmetric push, https://www.neutrik.com/en/product/nc3faah1-da AA Series, 3 pole XLR female receptacle with 6.35mm (1/4in) switching stereo jack, switched, with chrome ferrule and straight PCB pins, https://www.neutrik.com/en/product/nmj4hhd2 M Series, 6.35mm (1/4in) mono jack without switching contact, horizontal PCB mount, https://www.neutrik.com/en/product/nc4mah A Series, Chassis connector H female (A series.

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