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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 (or derived from) the Work and for which the stem radius adapts, as part of the non-compliance by some potentiometer or motor shafts to have their knobs affixed with a full threaded nose and offset PCB pins, https://www.neutrik.com/en/product/nmj6hhd2 Slim Jacks, 6.35mm (1/4in) switching stereo jack, switched, with chrome ferrule and straight.

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