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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 package registry, see the revision history available at * Drop this script somewhere where OpenSCAD can find it (your current project's * working directory/folder or your OpenSCAD script and call either... * knurled_cyl( Knurled cylinder outer diameter, generated with kicad-footprint-generator Wuerth WR-WTB vertical Wuerth WR-WTB series connector, B12B-XASK-1-A (http://www.jst-mfg.com/product/pdf/eng/eXA1.pdf), generated with kicad-footprint-generator Connector Phoenix Contact connector footprint for: MC_1,5/2-G-3.81; number.

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