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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 top (mm) hole_dist_top = 2.5; rail_clearance = 8.5; // mm from very top/bottom edge and where it is safe to put reinforcing walls; i.e. The thickness of 2mm - but adjust.

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