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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, http://www.keyelco.com/product-pdf.cfm?p=306 Fuseholder, 5x20, closed, horizontal, Bulgin, FX0457, Sicherungshalter, Fuseholder 5x20 closed horizontal Bulgin FX0457 Sicherungshalter PCB fuse holders for 5 times 0.127 mm² wires, basic insulation, conductor diameter 1.7mm, outer diameter 2mm, outer diameter 3.6mm, size source Multi-Contact FLEXI-E 2.5 (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 M2, height 2, Wuerth electronics 97730606332 (https://katalog.we-online.com/em/datasheet/97730606332.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py TSOP-I, 24 Pin (http://www.ti.com/lit/ds/symlink/tlc5971.pdf#page=39), generated with kicad-footprint-generator Mounting Hardware, inside through hole 2.25mm, height 6, Wuerth electronics 9776025960 (https://katalog.we-online.com/em/datasheet/9776025960.pdf), generated with kicad-footprint-generator Molex Micro-Fit 3.0 Connector System, 43045-2000 (alternative finishes: 43045-042x), 2 Pins per row (http://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=82181_SOFTSHELL_HIGH_DENSITY&DocType=CS&DocLang=EN), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-150-02-xxx-DV-A, 50 Pins (http://www.molex.com/pdm_docs/sd/5024260810_sd.pdf), generated with kicad-footprint-generator Molex PicoBlade Connector System, 53048-0410, 4 Pins (http://www.molex.com/pdm_docs/sd/908140004_sd.pdf), generated with kicad-footprint-generator connector Molex Micro-Fit_3.0 side entry Molex MicroClasp Wire-to-Board System, 55935-0430, 4 Pins per row (https://www.hirose.com/product/document?clcode=&productname=&series=DF11&documenttype=Catalog&lang=en&documentid=D31688_en), generated with kicad-footprint-generator Fuse SMD 1206 (3216 Metric), square (rectangular) end terminal, IPC_7351 nominal with elongated pad for handsoldering.

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