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VCF ~$8 in parts, needing only one tl074 and support 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 https://www.analog.com/media/en/technical-documentation/data-sheets/199399fc.pdf TO-92 2-pin leads in-line, narrow, oval pads, drill 0.75mm (https://www.diodes.com/assets/Package-Files/TO92S%20(Type%20B).pdf TO-92S_Wide package, drill 0.6mm (https://media.digikey.com/pdf/Data%20Sheets/Infineon%20PDFs/KT,KTY.pdf TO-92S package, 2-pin, drill 0.75mm (https://www.diodes.com/assets/Package-Files/TO92S%20(Type%20B).pdf TO-92 leads molded, narrow, drill 0.75mm (see NXP SSOP-TSSOP-VSO-REFLOW.pdf and sot510-1_po.pdf TSSOP, 44 Pin (http://ww1.microchip.com/downloads/en/DeviceDoc/2512S.pdf#page=17), generated with kicad-footprint-generator XP_POWER IHxxxxSH SIP DCDC-Converter XP_POWER IHxxxxS, SIP, (https://www.xppower.com/pdfs/SF_IH.pdf), generated with kicad-footprint-generator Soldered wire connection with feed through strain relief, for 3 times 2.5 mm² wires, reinforced insulation, conductor diameter 1.4mm, length 8.5mm, width 2.5mm Capacitor C, Disc series, Radial, pin pitch=19.05mm, , diameter=27.9mm, Vishay, IHB-3, http://www.vishay.com/docs/34015/ihb.pdf Inductor Radial series Radial pin pitch 21.80mm diameter 24.1mm Bourns 2200 L_Toroid, Horizontal series, Radial, pin pitch=15.00mm, , length*width=16.5*9.2mm^2, Capacitor, https://en.tdk.eu/inf/20/20/db/fc_2009/MKT_B32560_564.pdf C Rect series Radial pin pitch 23.00mm length 27mm width 11mm Capacitor C, Disc series, Radial, pin pitch=37.50mm, , length*width=41.5*15mm^2, Capacitor, http://www.wima.com/EN/WIMA_MKS_4.pdf C Rect series Radial pin pitch 27.50mm length 31.5mm width 20mm Capacitor C, Radial series, Radial, pin pitch=37.50mm, , length*width=41.5*19mm^2, Capacitor, http://www.wima.com/EN/WIMA_MKS_4.pdf C Rect series Radial pin pitch 2.54mm length 7.6mm diameter 3.6mm Resistor, Axial_DIN0411 series, Axial, Vertical, pin pitch=7.62mm, , length*diameter=23.37*12.7mm^2, Vishay, IHA-203, http://www.vishay.com/docs/34014/iha.pdf Inductor Axial series Axial Horizontal pin pitch 5.00mm diameter 13mm Electrolytic Capacitor CP Axial series Axial Horizontal pin pitch 5.00mm length 7mm width 2.5mm Capacitor C, Rect series, Radial, pin pitch=5.00mm, , diameter=10.5mm, Abacron, AISR-01, http://www.abracon.com/Magnetics/radial/AISR-01.pdf Inductor Radial series Radial pin pitch 5.00mm diameter 10mm Electrolytic Capacitor C, Rect series, Radial, pin pitch=2.50mm, diameter=6.3mm, height=7mm, Non-Polar Electrolytic Capacitor CP, Radial series, Radial, pin pitch=15.00mm, , length*width=16.5*10.7mm^2, Capacitor, https://en.tdk.eu/inf/20/20/db/fc_2009/MKT_B32560_564.pdf C Rect series Radial pin pitch 7.50mm length 9mm diameter 5.3mm Diode, DO-201AE series, Axial, Vertical, pin pitch=5.08mm, 4W, length*width*height=20*6.4*6.4mm^3.

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