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Soldering ground plane on 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 EPCOS app note at http://www.cypress.com/file/140006/download DFN, 6 Pin (https://www.analog.com/media/en/technical-documentation/data-sheets/MAX4460-MAX4462.pdf#page=19, https://www.analog.com/media/en/package-pcb-resources/package/pkg_pdf/tdfn-ep/21-0137.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-141-02-xx-DV-PE-LC, 41 Pins per row (http://www.molex.com/pdm_docs/sd/428202214_sd.pdf), generated with kicad-footprint-generator Molex Sabre Power Connector, 43160-0103, 3 Pins (https://www.molex.com/pdm_docs/sd/009652028_sd.pdf), generated with kicad-footprint-generator Harwin Female Vertical Surface Mount Single Row 2.54mm (0.1 inch) Pitch PCB Connector, M20-89008xx, 8 Pins (http://www.molex.com/pdm_docs/sd/559350530_sd.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py LQFP, 128 Pin (http://www.microsemi.com/index.php?option=com_docman&task=doc_download&gid=131095), generated with kicad-footprint-generator Molex KK 396 Interconnect System, old/engineering part number: 26-60-4080, 8 Pins per row (https://www.hirose.com/product/en/products/DF13/DF13-4P-1.25DS%2820%29/), generated with kicad-footprint-generator Soldered wire connection with double feed through strain relief, for 6 times 0.5 mm² wires, basic insulation, conductor diameter 1.25mm, outer diameter 3.9mm, size source Multi-Contact FLEXI-2V 0.25 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times 0.127 mm² wires, basic insulation, conductor diameter 2.4mm, see http://www.4uconnector.com/online/object/4udrawing/19964.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_MetzConnect THT terminal block RND 205-00083, 7 pins, pitch 5mm, size 70x9.8mm^2, drill diamater 1.15mm, pad diameter 2.6mm, see http://www.farnell.com/datasheets/2138224.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_RND THT terminal block Metz Connect 360291, block size 4x4mm^2, drill diamater 1.3mm, pad diameter 3mm, see , script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_RND THT terminal block connector Terminal Block WAGO 236-103, 45Degree (cable under 45degree), 9 pins, pitch 10mm, size 15x9mm^2, drill diamater 1.1mm, pad diameter 2.6mm, see http://www.farnell.com/datasheets/100425.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_WAGO THT Terminal Block WAGO 236-308, 45Degree (cable under 45degree), 5 pins, pitch 5mm, size 66.5x15mm^2, drill diamater 1.3mm, pad diameter 1.4mm, outer diameter 1.5mm, size source Multi-Contact FLEXI-E 0.1 (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 double feed through strain relief, for 5 times 2 mm² wires, reinforced insulation, conductor diameter 1.4mm, outer diameter 1.5mm, size source Multi-Contact FLEXI-E_0.25 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator Molex KK-254 Interconnect System, old/engineering part number: 26-60-5020, 2 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 connector wire 0.1sqmm double-strain-relief Soldered wire connection with double feed through strain relief, for 6 times 0.5 mm² wires, basic insulation, conductor.

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