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} shaft_hole(); } set_screw_hole(); } arrow_indicator(); indentations(); } } } // Gunnerkrigg Court // Gunnerkrigg Court // Gunnerkrigg Court elseif (strpos($article['link'], 'www.geekculture.com/joyoftech/') !== FALSE) { // make a 2d version v_wall(h=4, l=height-rail_clearance*2, th=right_rib_thickness); // top 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 front panel. I adjusted the height about right.

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