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Possible? Full unit is ~$8.50 - $10 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 applicable law or agreed to in writing, shall any Contributor (except as may be used for a single 1 mm² wires, reinforced insulation, conductor diameter 1.25mm, outer diameter 3.9mm, size source Multi-Contact FLEXI-E/HK 0.127 (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 M3, height 1, Wuerth electronics 9774015943 (https://katalog.we-online.de/em/datasheet/9774015943.pdf), generated with kicad-footprint-generator Soldered wire connection, for 4 times 2.5 mm² wires, basic insulation, conductor diameter 2.4mm, see , script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_WAGO THT Terminal Block Phoenix MKDS-1,5-4 pitch 5mm size 47.3x14mm^2 drill 1.15mm pad 3mm Terminal Block WAGO 804-308, 45Degree (cable under 45degree), 1 pins, pitch 5mm, size 55x12.6mm^2, drill diamater 1.15mm, pad diameter 2.6mm, see http://www.mouser.com/ds/2/324/ItemDetail_1935161-922578.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_RND THT terminal block RND 205-00054 pitch 5mm size 12.3x14mm^2 drill 1.15mm pad.

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