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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, direct solder car blade fuse mini, direct solder car blade fuse mini, direct solder car blade fuse direct solder car blade fuse direct solder 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 horizontal Bulgin FX0457 Sicherungshalter PCB fuse holders for 5 times 2 mm² wires, basic insulation, conductor diameter 1.7mm, size source Multi-Contact FLEXI-E_0.25 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator ipc_gullwing_generator.py TSSOP, 80 Pin (http://www.microsemi.com/index.php?option=com_docman&task=doc_download&gid=131095), generated with kicad-footprint-generator JST VH series connector, BM15B-GHS-TBT (http://www.jst-mfg.com/product/pdf/eng/eGH.pdf), generated with kicad-footprint-generator Soldered wire connection with double feed through strain relief, for 2 times 1.5 mm² wires, basic insulation, conductor diameter 1.25mm, outer diameter 3.9mm, size source Multi-Contact FLEXI-E 0.75 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator Mounting Hardware, inside through hole 4.5mm, height 2, Wuerth electronics 97730506334 (https://katalog.we-online.com/em/datasheet/97730506334.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py HTSSOP, 20 Pin (http://ww1.microchip.com/downloads/en/PackagingSpec/00000049BQ.pdf#page=276), generated with kicad-footprint-generator Molex Mini-Fit Sr. Power Connectors, old mpn/engineering number: 5569-04A2, example for new mpn: 39-29-4029, 1 Pins per row (http://suddendocs.samtec.com/prints/hle-1xx-02-xxx-dv-xx-xx-xx-mkt.pdf, http://suddendocs.samtec.com/prints/hle-dv-footprint.pdf), generated with kicad-footprint-generator Hirose series connector, 14110413002xxx (https://b2b.harting.com/files/download/PRD/PDF_TS/1411XX13002XXX_100228421DRW035C.pdf), generated with kicad-footprint-generator Soldered wire connection with double feed through strain relief, for 3 times outer diameter, generated with kicad-footprint-generator Soldered wire connection with feed through strain relief, for 6 times 0.15 mm² wires, basic insulation, conductor diameter 0.65mm, outer diameter 1mm, size source Multi-Contact FLEXI-2V 0.25 (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 double feed through strain relief, for 3 times outer diameter, generated with kicad-footprint-generator Molex Sabre Power Connector, 43160-0104, With thermal vias in pads, 5 Pins per row (http://www.molex.com/pdm_docs/sd/431602102_sd.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-140-02-xxx-DV-LC, 40 Pins per row (http://www.molex.com/pdm_docs/sd/530480210_sd.pdf), generated with kicad-footprint-generator Molex Mini-Fit Jr. Power Connectors, 42820-22XX, With thermal vias in pads, 6 Pins (http://www.farnell.com/datasheets/2157639.pdf), generated with kicad-footprint-generator Mounting Hardware, inside through hole 4.5mm, height 8, Wuerth electronics 9774020633 (https://katalog.we-online.com/em/datasheet/9774020633.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py VQFP, 128 Pin (https://www.nxp.com/docs/en/package-information/SOT425-1.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py NF-Transformer, ETAL, P3181, SMD, Hand Soldering, http://www.vishay.com/docs/85597/bzm55.pdf Diode Mini-MELF.

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