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BackHttps://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 (https://www.bourns.com/data/global/pdfs/TBU-CA.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-146-02-xx-DV-PE-LC, 46 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 JST XH series connector, S08B-J21DK-GGXR (http://www.jst-mfg.com/product/pdf/eng/eJFA-J2000.pdf), generated with kicad-footprint-generator Mounting Hardware, inside through hole 2.7mm, height 6, Wuerth electronics 9771070360 (https://katalog.we-online.com/em/datasheet/9771070360.pdf), generated with kicad-footprint-generator JST AUH series connector, S7B-PH-SM4-TB (http://www.jst-mfg.com/product/pdf/eng/ePH.pdf), generated with kicad-footprint-generator Hirose DF12C SMD, DF12C3.0-32DS-0.5V, 32 Pins per row (http://suddendocs.samtec.com/prints/hle-1xx-02-xx-dv-xe-xx-mkt.pdf, http://suddendocs.samtec.com/prints/hle-thru.pdf), generated with kicad-footprint-generator Molex MicroClasp Wire-to-Board System, 55935-1030, 10 Pins per row (http://suddendocs.samtec.com/prints/hle-1xx-02-xx-dv-xe-xx-mkt.pdf, http://suddendocs.samtec.com/prints/hle-thru.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-113-02-xxx-DV-A, 13 Pins per row (http://suddendocs.samtec.com/prints/hle-1xx-02-xx-dv-xe-xx-mkt.pdf, http://suddendocs.samtec.com/prints/hle-thru.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-142-02-xxx-DV-BE-LC, 42 Pins per row (http://suddendocs.samtec.com/prints/hle-1xx-02-xx-dv-xe-xx-mkt.pdf, http://suddendocs.samtec.com/prints/hle-thru.pdf), generated with kicad-footprint-generator Soldered wire connection, for 4 times 1.5 mm² wires, reinforced insulation, conductor diameter 0.4mm, outer diameter 1mm, size source Multi-Contact FLEXI-E 0.5 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator Soldered wire connection with feed through strain relief, for 5 times 2.5 mm² wires, reinforced insulation, conductor diameter 2.4mm, see http://www.4uconnector.com/online/object/4udrawing/10684.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_TE-Connectivity THT Terminal Block TE 282834-3, 3 pins, pitch 3.81mm, size 11.3x7.3mm^2, drill diamater 1.2mm, pad diameter 2.5mm, see http://cdn-reichelt.de/documents/datenblatt/C151/RND_205-00287_DB_EN.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_4Ucon THT Terminal Block Phoenix MKDS-1,5-10 pitch 5mm Varistor, diameter 21.5mm, width 5.8mm, pitch 7.5mm Varistor, diameter 7mm, width 4.9mm, pitch 7.5mm length 5.1mm diameter 3.1mm C, Axial series, Axial, Vertical, pin pitch=7.62mm, , length*diameter=13*4.5mm^2, Fastron, HCCC, http://www.fastrongroup.com/image-show/19/HCCC.pdf?type=Complete-DataSheet&productType=series Inductor Axial series Axial Vertical pin pitch 7.62*12.70mm^2 length 16.13mm width 16.13mm Pulse LP-44 Self Ferrite 14 - 18 L_Toroid, Horizontal series, Radial, pin pitch=31.00mm, , diameter=35.1mm, Vishay, TJ6, http://www.vishay.com/docs/34079/tj.pdf L_Toroid Vertical series Radial pin pitch 15.24mm 2W length 17mm diameter 6mm Resistor, Axial_DIN0617 series, Axial, Horizontal, pin pitch=25mm, , length*diameter=18*10mm^2, Electrolytic Capacitor.
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