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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 = 13.0A, Itrip=24.0A, http://www.bourns.com/docs/product-datasheets/mfrht.pdf bourns ptc resettable fuse polyfuse MF-SM MF-SMHT Littelfuse, resettable fuse, PTC, polyswitch LVR200, Ih 2A, http://www.littelfuse.com/~/media/electronics/datasheets/resettable_ptcs/littelfuse_ptc_lvr_catalog_datasheet.pdf.pdf LVR200 PTC resettable polyswitch Fuse, Littelfuse, 372, 8.5x8mm, https://www.littelfuse.com/~/media/electronics/datasheets/fuses/littelfuse_fuse_372_datasheet.pdf.pdf Fuse, TE5, Littelfuse/Wickmann, No. 460, No560, https://www.littelfuse.com/~/media/electronics/datasheets/fuse_holders/littelfuse_fuse_holder_559_560_datasheet.pdf.pdf Fuse Fuseholder ATO Blade littelfuse Pudenz 2 Pin (https://www.bourns.com/data/global/pdfs/TBU-CA.pdf), generated with kicad-footprint-generator JST J2100 series connector, 502386-0670 (http://www.molex.com/pdm_docs/sd/5023860270_sd.pdf), generated with kicad-footprint-generator Hirose DF63 through hole, DF13-07P-1.25DSA, 7 Pins (https://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=826576&DocType=Customer+Drawing&DocLang=English), generated with kicad-footprint-generator JST PUD series connector, B15B-EH-A (http://www.jst-mfg.com/product/pdf/eng/eEH.pdf), generated with kicad-footprint-generator Molex PicoBlade series connector, SM12B-SRSS-TB (http://www.jst-mfg.com/product/pdf/eng/eSH.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-136-02-xxx-DV-LC, 36 Pins (https://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=826576&DocType=Customer+Drawing&DocLang=English), generated with kicad-footprint-generator Molex SPOX Connector System, 43045-1400 (alternative finishes: 43045-180x), 9 Pins (https://www.molex.com/pdm_docs/sd/026605050_sd.pdf), generated with kicad-footprint-generator JST XA series connector, SM17B-SURS-TF (http://www.jst-mfg.com/product/pdf/eng/eSUR.pdf), generated with kicad-footprint-generator Capacitor SMD 3640 (9110 Metric), square (rectangular) end terminal, IPC_7351 nominal with elongated pad for handsoldering. (Body size source: IPC-SM-782 page 76, https://www.pcb-3d.com/wordpress/wp-content/uploads/ipc-sm-782a_amendment_1_and_2.pdf), generated with kicad-footprint-generator JST PH series connector, S4P-VH (http://www.jst-mfg.com/product/pdf/eng/eVH.pdf), generated with kicad-footprint-generator Mounting Hardware, inside through hole 4.5mm, height 5, Wuerth electronics 9771100360 (https://katalog.we-online.com/em/datasheet/9771100360.pdf), generated with kicad-footprint-generator Mounting Hardware, inside through hole M3, height 12, Wuerth electronics 9776040960 (https://katalog.we-online.com/em/datasheet/9776040960.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py QFN, 32 Pin (https://www.ti.com/lit/ds/symlink/bq25703a.pdf#page=90), generated with kicad-footprint-generator Hirose FH12, FFC/FPC connector, FH12-32S-0.5SH, 32 Pins per row (http://www.molex.com/pdm_docs/sd/022035035_sd.pdf), generated with kicad-footprint-generator Harting har-flexicon series connector, DF3EA-15P-2H (https://www.hirose.com/product/document?clcode=CL0543-0332-0-51&productname=DF3EA-5P-2H(51)&series=DF3&documenttype=2DDrawing&lang=en&documentid=0001163317), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-114-02-xxx-DV-BE, 14 Pins per row, Mounting: Snap-in Plastic Peg PCB Lock (http://www.molex.com/pdm_docs/sd/039300020_sd.pdf), generated with kicad-footprint-generator Soldered.

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