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+ jackHoleDiameter : panelInnerHeight + jackHoleDiameter] for(horizontalOffset = [horizontalJackHoleSpacing + jackHoleDiameter : panelInnerHeight + jackHoleDiameter] for(horizontalOffset = [horizontalJackHoleSpacing + jackHoleDiameter / 2 + 3 + tolerance*8; right_panel_width = width_mm - thickness; // additives - labels, etc // 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.

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