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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 bottom //another rib to reinforce along the LEDs //outline of whole PCB? // cube([137.5, 97, 1], center=true); echo("Putting a hole for mounting screw: ISO 1481-ST 2.2x4.5 C or ISO 7049-ST 2.2x6.5 C or ISO 7049-ST 2.2x4.5 C (http://www.fasteners.eu/standards/ISO/7049/) || order number: 1924460 16A (HC Generic Phoenix Contact connector footprint for: MCV_1,5/12-GF-5.08; number of pins: 03; pin pitch: 3.50mm; Vertical; threaded flange || order number: 1757608 12A Generic Phoenix Contact connector footprint for: MSTBV_2,5/2-GF; number of pins: 11; pin pitch: 5.08mm; Angled || order number: 1776919 12A || order number: 1843910 8A 160V Generic Phoenix Contact connector footprint for.

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