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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 (see NXP SSOP-TSSOP-VSO-REFLOW.pdf and sot371-1_po.pdf STC SOP, 16 Pin (https://pdfserv.maximintegrated.com/package_dwgs/21-0140.PDF (T2055-5)), generated with kicad-footprint-generator Soldered wire connection, for 4 times 0.1 mm² wires, basic insulation, conductor diameter 0.9mm, outer diameter 2.3mm, size source Multi-Contact FLEXI-xV 1.0 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator ipc_noLead_generator.py QFN, 28 Pin (package code T2844-1; https://pdfserv.maximintegrated.com/package_dwgs/21-0139.PDF), generated with kicad-footprint-generator Molex MicroClasp Wire-to-Board System, 55932-1430, 14 Pins per row (http://www.molex.com/pdm_docs/sd/428202214_sd.pdf), generated with kicad-footprint-generator Molex Nano-Fit Power Connectors, old mpn/engineering number: 5569-12A2, example for new mpn: 39-30-0060, 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 PicoBlade series connector, S8B-PH-SM4-TB (http://www.jst-mfg.com/product/pdf/eng/ePH.pdf), generated with kicad-footprint-generator JST PUD series connector, BM02B-ACHSS-GAN-ETF (http://www.jst-mfg.com/product/pdf/eng/eACH.pdf), generated with kicad-footprint-generator Molex Nano-Fit Power Connectors, 43915-xx06, 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 Hirose DF12E SMD, DF12E3.0-80DP-0.5V, 80 Pins (http://www.molex.com/pdm_docs/sd/5024301410_sd.pdf), generated with kicad-footprint-generator Soldered wire connection with double feed through strain relief, for 6 times 0.15 mm² wire, basic insulation, conductor diameter 0.48mm, outer diameter 3mm, see , script-generated with , script-generated with , script-generated with , script-generated with , script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_RND THT terminal block Metz Connect Type059_RT06306HBWC pitch 3.5mm size 36x8.3mm^2 drill 1.3mm pad 2.6mm terminal block RND 205-00048 pitch 5mm size 20x12.6mm^2 drill 1.3mm pad 2.5mm terminal block RND 205-00052, 9 pins, pitch 5.08mm, size 50.8x11.2mm^2, drill diamater 1.3mm, pad diameter 2.4mm, outer diameter 2.3mm, 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 2.5 mm² wires, basic insulation, conductor diameter 0.48mm, outer diameter 3.9mm.

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