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= KnobMinorRadius*.4; // Primary knob cylinder for (i=[0 : RingMarkings-1] rotate([0, 0, i * (360/Knurls)] rotate([0, TaperAngle, 0]) rotate([0, 0, i * (360/RingMarkings)] cube([RingWidth*.5, MarkingWidth, 2], center=true); cube([8, 3, KnobHeight], center=true); // Flat for D-shaped hole } // draw a "vertical" wall to mount the circuit board to, dead center // 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 the 16-pin connectors, consider incorporating additional LED indicators for use of gate and CV).

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