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Wall(h=4, w=width_mm-hole_dist_top-4); // 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 https://www.analog.com/media/en/technical-documentation/data-sheets/199399fc.pdf TO-92 2-pin leads in-line, wide, drill 0.75mm (see e.g. Https://www.ctscorp.com/wp-content/uploads/206-208.pdf 8x-dip-switch SPST , Piano, row spacing 9.53 mm (375 mils 22-lead surface-mounted (SMD) DIP package, row spacing 6.15 mm (242 mils), body size 6.7x24.42mm (see e.g. Https://www.ctscorp.com/wp-content/uploads/206-208.pdf 5x-dip-switch SPST , Slide, row spacing 15.24 mm (600 mils), Socket, LongPads 24-lead though-hole mounted.

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