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+ 2; // plastic walls are 2mm clf_shaft_diameter = 6.3; // the D shape "removed" from the top to bottom of box [right_edge, -extra_depth], // bottom horizontal rib h_wall(h=4, l=right_rib_x); // 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 https://www.schmitzbits.de/ms20.html which is good practice, but ho-dang what a mess a3d4f2b82e romps with traces, vias, and net.

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