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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 dial. Set to zero if you don't want a D-shaped shafthole cross-section. 0 to keep it round. [mm] shafthole_cutoff_arc_height = 0.35; /* [Stem (optional)] */ // Line segments for a box film cap instead of latch, https://www.neutrik.com/en/product/nc3fav1-0 A Series, 3 pole female receptacle, grounding: mating connector shell to pin1 and front panel, horizontal PCB mount, black chrome shell, https://www.neutrik.com/en/product/nc5fbh-b B Series, 5 pole female XLR receptacle, grounding: mating connector shell to pin1 and front panel, horizontal PCB mount, https://www.neutrik.com/en/product/nc3mbh B Series, 5 pole male XLR receptacle, grounding: separate ground contact to mating connector shell and front panel, vertical PCB mount, https://www.neutrik.com/en/product/nl4md-h-2 speakON Chassis Connectors, 4 pole chassis connector, black D-size flange, countersunk thru holes, horizontal PCB mount, https://www.neutrik.com/en/product/nc3fahr1 A Series, 3 pole XLR female receptacle with 6.35mm (1/4in) stereo jack, metal nose with efficient chassis ground connection, T+R+S normalling contact, https://www.neutrik.com/en/product/nrj6hm-1-au Slim Jacks, 6.35mm (1/4in) mono jack, switched, fully threaded nose.

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