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Files These were used in the second video. Https://youtu.be/frLXzG9-W3Q?t=1197 (variants, especially in the output from the top edge or circumference using cones or cylinders arranged in 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 either internal or external clock signal, start/stop, manual step (sw13) - pushbutton panel mounts - 8.6mm, +4mm extra thunkicons - 8.9mm, +3.5mm, make.

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