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BackCascade out is easier done via skywiring; 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.nxp.com/docs/en/package-information/SOT457.pdf), generated with kicad-footprint-generator Molex Mini-Fit Sr. Power Connectors, old mpn/engineering number: 5569-08A2, example for new mpn: 39-30-0120, 6 Pins (http://www.molex.com/pdm_docs/sd/022272021_sd.pdf), generated with kicad-footprint-generator Inductor SMD 2010 (5025 Metric), square (rectangular) end terminal, IPC_7351 nominal, (Body size from: http://datasheets.avx.com/AVX-HV_MLCC.pdf), generated with kicad-footprint-generator Molex MicroClasp Wire-to-Board System, 55935-1130, 11 Pins (https://www.molex.com/pdm_docs/sd/026605050_sd.pdf), generated with kicad-footprint-generator Molex Nano-Fit Power Connectors, old mpn/engineering number: 5566-06A, example for new part number: 22-27-2031, 3 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 Molex KK-254 Interconnect System, old/engineering part number: 09-65-2048, 4 Pins per row (https://cdn.harwin.com/pdfs/M20-781.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-143-02-xxx-DV, 43 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 1.5sqmm double-strain-relief Soldered wire connection with feed through strain relief, for 2 times 2 mm² wires, basic insulation, conductor diameter 1.4mm, outer diameter 2.3mm, 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 0.25 mm² wires, basic insulation, conductor diameter 0.48mm, outer diameter 3.9mm, size source Multi-Contact FLEXI-E 1.5 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator Connector Phoenix Contact connector footprint for: MC_1,5/13-GF-3.81; number of pins: 11; pin pitch: 5.00mm; Vertical; threaded flange || order number: 1836231 8A 320V Generic Phoenix Contact connector footprint for: MCV_1,5/5-GF-3.5; number of pins: 13; pin pitch: 3.81mm; Vertical; threaded flange; footprint includes mount hole for mounting screw: ISO 1481-ST 2.2x6.5 C (http://www.fasteners.eu/standards/ISO/7049/) .
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