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(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 EPCOS app note 93 (https://www.catagle.com/45-2/PDF_AN93.htm Bourns TBU-CA Fuse, 2 Pin fuse holder, car blade fuse mini, http://www.keyelco.com/product-pdf.cfm?p=306 Fuseholder, 5x20, closed, vertical, Bulgin, FX0456, https://www.bulgin.com/products/pub/media/bulgin/data/Fuseholders.pdf Fuseholder 5x20 closed horizontal Shock-Safe Fuseholder, 5 x 20 mm.

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