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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 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, 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 vertical Bulgin FX0456 Sicherungshalter Fuseholder, 5x20, closed, horizontal, Bulgin, FX0457, Sicherungshalter, Fuseholder 5x20 closed horizontal Bulgin FX0457 Sicherungshalter PCB fuse holders for 5 times 0.25 mm² wires, basic insulation, conductor diameter 1.25mm, outer diameter 3mm, see , script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_MetzConnect THT terminal block RND 205-00080 vertical pitch 3.5mm size 46.2x7mm^2 drill 1.2mm pad 2.4mm Terminal Block 4Ucon ItemNo. 10705 vertical pitch 3.5mm size 24.5x7.6mm^2 drill 1.2mm pad 2mm PhoenixContact PTSM0,5 2 2,5mm vertical SMD spring clamp terminal block RND 205-00058, 45Degree (cable under 45degree), 6 pins, pitch 5mm, size 15x8.3mm^2, drill diamater 1.15mm, pad diameter 3mm, see , script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_Phoenix THT Terminal Block 4Ucon ItemNo. 10689, 12 pins, single row style2 pin1 right Through hole angled pin header SMD 1x26 2.00mm single row male, vertical entry, strain relief clip Harwin LTek Connector, 4 pins, pitch 10mm, size 22.3x14mm^2, drill diamater 1.4mm, pad diameter 3mm, see , script-generated.

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