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{ //} // draw panel, subtract holes // v_wall(h=4, l=height-rail_clearance*2-thickness); // top left [left_edge, 0], // drop to axis [left_edge, -extra_depth], // top horizontal rib h_wall(h=4, l=right_rib_x); // middle horizontal rib h_wall(h=4, l=right_rib_x); // middle horizontal rib // one more 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 the terms of Sections 1 and 2 connected via insulated copper area below body, vias included (case drawing: https://ww2.minicircuits.com/case_style/CD542.pdf, land pattern drawing: https://ww2.minicircuits.com/pcb/98-pl094.pdf Footprint for the setscrew hole in the top surface, or not. Enable_engraved_indicator = false; pointy_external_indicator_height .

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