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// v_wall(h=4, l=height-rail_clearance*2-thickness); // top horizontal rib // h_wall(h=1.6, l=right_rib_x); // middle horizontal rib h_wall(h=1.6, l=right_rib_x); // one more to mount the circuit board to, dead center // one more vertical to mount a circuit outside 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 applicable law (such as a full threaded nose and offset PCB pins, https://www.neutrik.com/en/product/nmj6hfd3 M Series, 6.35mm (1/4in) jack receptacle, horizontal pcb mount, https://www.neutrik.com/en/product/nlj2md-v speakON Chassis Connectors, 2 pole chassis connector, black D-size flange, self tapping screw holes (A-screw), horizontal PCB mount, additional ground contacts, https://www.neutrik.com/en/product/nc3mbh-e B Series, 3 pole male XLR receptacle, grounding: separate ground contact to mating connector shell and front panel, horizontal PCB mount, https://www.neutrik.com/en/product/nc3mamh-ph speakON Combo, 2 pole chassis connector, metal housing, vertical PCB mount, https://www.neutrik.com/en/product/nl4md-h-1 speakON Chassis Connectors, 4 pole chassis connector, nickel metal square G-size flange, self tapping screw holes (A-screw), horizontal PCB mount, https://www.neutrik.com/en/product/nc3faah1 AA Series, 3 pole XLR female receptacle with 6.35mm (1/4in) stereo jack, switched.

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