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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 direct solder car blade fuse direct solder car blade fuse mini, direct solder car blade fuse direct solder car blade fuse direct solder car blade fuse mini, direct solder car blade fuse mini PTC Resettable Fuse, Ihold = 3.0A, Itrip=6.0A, http://www.bourns.com/docs/product-datasheets/mfrht.pdf PTC Resettable Fuse, Ihold = 5.5A, Itrip=10.0A, http://www.bourns.com/docs/product-datasheets/mfrht.pdf PTC Resettable Fuse, Ihold = 5.5A, Itrip=10.0A, http://www.bourns.com/docs/product-datasheets/mfrht.pdf PTC Resettable Fuse, Ihold = 6.0A, Itrip=10.2A, http://www.bourns.com/docs/Product-Datasheets/mfrg.pdf PTC Resettable Fuse, Ihold = 7.0A, Itrip=11.9A, http://www.bourns.com/docs/Product-Datasheets/mfrg.pdf PTC Resettable Fuse, Ihold = 4.0A, Itrip=6.8A, http://www.bourns.com/docs/Product-Datasheets/mfrg.pdf PTC Resettable Fuse, Ihold = 9.0A, Itrip=16.5A, http://www.bourns.com/docs/product-datasheets/mfrht.pdf PTC Resettable Fuse, Ihold = 1.0A, Itrip=1.8A, http://www.bourns.com/docs/product-datasheets/mfrht.pdf PTC Resettable Fuse, Ihold = 7.0A, Itrip=11.9A, http://www.bourns.com/docs/Product-Datasheets/mfrg.pdf PTC Resettable Fuse, Ihold = 11.0A, Itrip=20.0A, http://www.bourns.com/docs/product-datasheets/mfrht.pdf PTC Resettable Fuse, Ihold = 3.0A, Itrip=5.1A, http://www.bourns.com/docs/Product-Datasheets/mfrg.pdf ptc resettable fuse polyfuse MF-SM MF-SMHT Littelfuse, resettable fuse, PTC, polyswitch LVR100, Ih 1A http://www.littelfuse.com/~/media/electronics/datasheets/resettable_ptcs/littelfuse_ptc_lvr_catalog_datasheet.pdf.pdf LVR100 PTC.

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