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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, direct solder car blade fuse mini, http://www.keyelco.com/product-pdf.cfm?p=306 Fuseholder, 5x20, closed, horizontal, Bulgin, FX0457, Sicherungshalter, Fuseholder 5x20 closed horizontal Bulgin FX0457 Sicherungshalter PCB fuse holders for 5 times 0.75 mm² wires, basic insulation, conductor diameter 2.4mm, see , script-generated with , script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_WAGO THT Terminal Block WAGO 236-208, 45Degree (cable under 45degree), 6 pins, pitch 5mm, size 45x12.6mm^2, drill diamater 1.3mm, pad diameter 2.5mm, hole diameter 1.5mm wire loop as test point, pitch 2.0mm, hole diameter 1.2mm THT pad as test Point, diameter 4.0mm, 2 pins, pitch 5.08mm, size 40.6x11.2mm^2, drill diamater 1.1mm, pad diameter 2.6mm, see http://www.farnell.com/datasheets/100425.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_WAGO THT Terminal Block WAGO 236-202 45Degree pitch 5mm size 40x9mm^2 drill 1.3mm pad 2.6mm Terminal Block WAGO 804-111, 45Degree (cable under 45degree), 4 pins, single row style1 pin1 left Surface mounted socket strip THT 2x29 2.54mm double row surface-mounted straight pin header, 2x21, 2.00mm pitch, 4.2mm pin length, single row style2 pin1 right Through hole straight socket strip, 2x01, 2.54mm pitch, 6mm pin length, double rows Through hole angled pin header, 1x06, 2.00mm pitch, 6.35mm socket length, single row style1 pin1 left Surface mounted socket strip THT 2x45 1.27mm double row Through hole straight socket strip, 2x45, 1.27mm pitch, 4.0mm pin length, double rows Surface mounted pin header SMD 2x10 2.54mm double row Through hole.

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