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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 (https://www.bourns.com/data/global/pdfs/TBU-CA.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py QFN, 24 Pin (http://www.ti.com/lit/ds/symlink/tlc5971.pdf#page=39), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-138-02-xxx-DV-BE-A, 38 Pins per row (https://www.hirose.com/product/en/products/DF13/DF13C-10P-1.25V%2851%29/), generated with kicad-footprint-generator Mounting Hardware, inside through hole M3, height 2, Wuerth electronics 9774070943 (https://katalog.we-online.de/em/datasheet/9774070943.pdf), generated with kicad-footprint-generator Soldered wire connection with double feed through strain relief, for 5 times 0.25 mm² wires, basic insulation, conductor diameter 2mm, see http://www.produktinfo.conrad.com/datenblaetter/550000-574999/556444-da-01-de-LEITERPLATTENKL__PTSM_0_5__4_2_5_V_THR.pdf, script-generated with , script-generated with , script-generated with , script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_RND THT terminal block Metz Connect Type701_RT11L02HGLU pitch 6.35mm size 12.7x12.5mm^2 drill 1.3mm pad 2.5mm terminal block RND 205-00050 pitch 5mm size 20x12.5mm^2 drill 1.4mm pad 2.7mm terminal block RND 205-00023, 2 pins, pitch 5.08mm, size 25.4x8mm^2, drill diamater 1.3mm, pad diameter 2.1mm, see http://www.te.com/commerce/DocumentDelivery/DDEController?Action=showdoc&DocId=Customer+Drawing%7F282834%7FC1%7Fpdf%7FEnglish%7FENG_CD_282834_C1.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_RND THT terminal block connector http://www.phoenixcontact.com/us/products/1778751/pdf terminal block RND 205-00004 pitch 5mm size 10x8.3mm^2 drill 1.3mm pad 2.5mm terminal block RND 205-00020 pitch 5mm size 45x8.1mm^2 drill 1.1mm pad 2.1mm terminal block Metz Connect Type175_RT02705HBLC, 5 pins, pitch 10mm, size 65x9mm^2, drill diamater 1.1mm, pad diameter 2.2mm, see http://www.mouser.com/ds/2/324/ItemDetail_1725672-916605.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_RND THT terminal block Metz Connect Type205_RT04503UBLC, 45Degree (cable under 45degree), 5 pins, pitch 3.5mm, size 49x7.6mm^2, drill diamater 1.3mm, pad diameter 2.5mm, see http://cdn-reichelt.de/documents/datenblatt/C151/RND_205-00056_DB_EN.pdf, script-generated with , script-generated with , script-generated with , script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_WAGO THT Terminal Block WAGO 804-307 45Degree pitch 10mm length 3.8mm diameter 2.6mm Diode, T-1 series, Axial, Horizontal, pin pitch=25.4mm, , length*diameter=16*6.3mm^2, Fastron, VHBCC, http://www.fastrongroup.com/image-show/25/VHBCC.pdf?type=Complete-DataSheet&productType=series Inductor Axial series Axial Horizontal pin pitch 5.00mm length 7.2mm width 2.5mm Capacitor C, Disc series, Radial, pin pitch=7.50mm, , diameter=17mm, Electrolytic Capacitor CP, Radial_Tantal series, Radial, pin pitch=10.00mm, , length*width=11.0*6.4mm^2, Capacitor, https://en.tdk.eu/inf/20/20/db/fc_2009/MKT_B32560_564.pdf C Rect series Radial pin pitch 5.00mm diameter 10.5mm C, Disc series, Radial, pin pitch=5.00mm, diameter=10mm, height=20mm, Non-Polar Electrolytic Capacitor CP, Axial series, Axial, Vertical, pin pitch=2.54mm, 0.25W = 1/4W length 6.3mm diameter 2.5mm Resistor, Axial_DIN0207 series, Axial, Horizontal, pin pitch=12.7mm, , length*diameter=7.6*3.6mm^2, , http://www.diodes.com/_files/packages/DO-15.pdf.

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