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Kassutronic's KS-20 https://kassu2000.blogspot.com/2019/07/ks-20-filter.html ** 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 PTC Resettable Fuse, Ihold = 5.0A, Itrip=9.0A, http://www.bourns.com/docs/product-datasheets/mfrht.pdf PTC Resettable Fuse, Ihold = 3.0A, Itrip=6.0A, http://www.bourns.com/docs/product-datasheets/mfrht.pdf PTC Resettable Fuse, Ihold = 9.0A, Itrip=16.5A, http://www.bourns.com/docs/product-datasheets/mfrht.pdf PTC Resettable Fuse, Ihold = 5.5A, Itrip=10.0A.

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