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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 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 vertical Bulgin FX0456 Sicherungshalter Fuseholder, 5x20, closed, vertical, Bulgin, FX0456, https://www.bulgin.com/products/pub/media/bulgin/data/Fuseholders.pdf Fuseholder 5x20 closed vertical Bulgin FX0456 Sicherungshalter Fuseholder, 5x20, closed, vertical, Bulgin, FX0456, https://www.bulgin.com/products/pub/media/bulgin/data/Fuseholders.pdf Fuseholder 5x20 closed vertical Bulgin FX0456 Sicherungshalter Fuseholder, 5x20, closed, vertical, Bulgin, FX0456, https://www.bulgin.com/products/pub/media/bulgin/data/Fuseholders.pdf Fuseholder 5x20 closed vertical Bulgin FX0456 Sicherungshalter Fuseholder, 5x20, closed, horizontal, Bulgin, FX0457, Sicherungshalter, Fuseholder 5x20 closed vertical Bulgin FX0456 Sicherungshalter Fuseholder, 5x20, closed, vertical, Bulgin, FX0456, https://www.bulgin.com/products/pub/media/bulgin/data/Fuseholders.pdf Fuseholder 5x20 closed horizontal Bulgin FX0457 Sicherungshalter PCB fuse holders for 5 times 0.1 mm² wires, reinforced insulation, conductor diameter 1.25mm, outer diameter 1.5mm, size source Multi-Contact FLEXI-E 0.15 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator Soldered wire connection with feed through strain relief, for 4 times 1 mm² wires, basic insulation, conductor diameter 0.65mm, outer diameter 3.9mm, size source Multi-Contact FLEXI-xV 1.5 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times 0.75 mm² wires, reinforced insulation, conductor diameter 2.4mm, outer diameter 1mm, size source Multi-Contact FLEXI-xV 0.75 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times 0.15 mm² wires, basic insulation, conductor diameter 1.25mm, outer diameter 2.1mm, see http://cdn-reichelt.de/documents/datenblatt/C151/RND_205-00045_DB_EN.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_Phoenix THT Terminal Block WAGO 236-508 45Degree pitch 5mm size 45x10mm^2 drill 1.3mm pad 2.6mm Terminal Block Philmore pitch 5mm size 122x14mm^2 drill 1.15mm pad 3mm Terminal Block 4Ucon ItemNo. 20001 pitch 3.5mm size 49x7.6mm^2 drill 1.2mm pad 2.4mm Terminal Block WAGO 236-406 45Degree pitch 5mm size 25x10.5mm^2 drill 1.4mm pad 2.6mm terminal block RND 205-00025 pitch 10mm size 45x8.1mm^2 drill 1.3mm pad 2.5mm terminal block RND 205-00294 pitch 5.08mm size 76.2x11.2mm^2 drill 1.3mm pad 2.5mm terminal block RND 205-00080 vertical pitch 2.5mm size 13x5mm^2 drill 1.2mm pad 2.4mm Terminal Block Phoenix MKDS-1,5-12 pitch 5mm size 45x9mm^2 drill 1.3mm pad 2.6mm.

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