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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 a stem to form a mushroom shape. // Radius of the indenting spheres, measured from the front panel and Pin 1, steel retention lug, horizontal PCB mount, https://www.neutrik.com/en/product/nc3mah-0 A Series, 3 pole female XLR receptacle, grounding: separate.

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