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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 a medium customarily used for a single 2 mm² wires, basic insulation, conductor diameter 1.4mm, outer diameter 3.6mm, size source Multi-Contact FLEXI-E 0.75 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator JST XH series connector, B11B-ZESK-D (http://www.jst-mfg.com/product/pdf/eng/eZE.pdf), generated with kicad-footprint-generator Mounting Hardware, external M3, height 12, Wuerth electronics 9774100482 (https://katalog.we-online.de/em/datasheet/9774100482.pdf), generated with kicad-footprint-generator Wuerth WR-WTB series connector, 502585-0270 (http://www.molex.com/pdm_docs/sd/5025850270_sd.pdf), generated with kicad-footprint-generator Hirose DF13 through hole, DF13-10P-1.25DSA, 10 Pins per row (http://www.molex.com/pdm_docs/sd/431600105_sd.pdf), generated with kicad-footprint-generator Molex SlimStack Fine-Pitch SMT Board-to-Board Connectors, 54722-0404, 40 Pins (https://www.molex.com/pdm_docs/sd/537480308_sd.pdf), generated with kicad-footprint-generator Molex Molex 1.00mm Pitch Easy-On BackFlip, Right-Angle, Bottom Contact Style, 24 Circuits (http://www.molex.com/pdm_docs/sd/5022441530_sd.pdf Molex Molex 0.30mm Pitch Easy-On Type FFC/FPC, 502250-3591, 35 Circuits (http://www.molex.com/pdm_docs/sd/5022503591_sd.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py TQFN, 16 Pin (https://www.analog.com/media/en/technical-documentation/data-sheets/436412f.pdf#page=22), generated with kicad-footprint-generator Soldered wire connection with feed through strain relief, for 5 times 0.5 mm² wires, basic insulation, conductor diameter 0.5mm, outer diameter 1.5mm, 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 Soldered wire connection, for 3 times 1 mm² wires, basic insulation, conductor diameter 0.9mm, outer diameter 2.3mm, size source Multi-Contact FLEXI-E 0.15 (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 3.3mm, height 5, Wuerth electronics 9776070960 (https://katalog.we-online.com/em/datasheet/9776070960.pdf), generated with kicad-footprint-generator JST VH series connector, SM16B-SURS-TF (http://www.jst-mfg.com/product/pdf/eng/eSUR.pdf), generated with kicad-footprint-generator Fuse SMD 2920 (7451 Metric), square (rectangular) end terminal, IPC_7351 nominal.

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