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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 circumference surface. // Number of indenting spheres. ≥30 means "round, using current quality setting". Cone_indents_faces = 30; /* [Engraved Indicator (optional)] */ // Line segments for circles FN = 60; // [1:1:360] // Unit size (mm // Horizontal pitch size (mm .

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