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Slightly larger spacing on the bottom of box [right_edge, -extra_depth], // bottom right [right_edge, rotate_vector_sin * height], // top horizontal rib // middle horizontal rib // h_wall(h=4, l=right_rib_x); // 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 footprint. Some options: Bourns PTL series, such as: ** Would need another supplier, mouser sells only in 1000+ for.

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