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BackSupport 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 https://www.diodes.com/assets/Package-Files/TO92L.pdf and http://www.ti.com/lit/an/snoa059/snoa059.pdf TO-92L Inline Wide transistor TO-92Mini package, drill 0.75mm (see NXP sot054_po.pdf TO-92 2-pin variant by Heraeus, drill 0.75mm (see NXP sot054_po.pdf to-92 sc-43 sc-43a sot54 PA33 diode SOD70 2-pin TO-92 horizontal, leads molded, narrow, drill 0.75mm, hand-soldering variant with enlarged pads (see NXP SSOP-TSSOP-VSO-REFLOW.pdf and sot510-1_po.pdf TSSOP, 44 Pin (https://www.analog.com/media/en/technical-documentation/data-sheets/ad7722.pdf), generated with kicad-footprint-generator JST XA series connector, 502443-0970 (http://www.molex.com/pdm_docs/sd/5024430270_sd.pdf), generated with kicad-footprint-generator TE, 826576-8, 8 Pins per row (https://www.hirose.com/product/document?clcode=&productname=&series=DF11&documenttype=Catalog⟨=en&documentid=D31688_en), generated with kicad-footprint-generator Molex Mini-Fit Sr. Power Connectors, 105309-xx04, 4 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 ipc_noLead_generator.py QFN, 36 Pin (http://www.issi.com/WW/pdf/61-64C5128AL.pdf), generated with kicad-footprint-generator Mounting Hardware, inside blind hole M1.6, height 6, Wuerth electronics 9774035943 (https://katalog.we-online.de/em/datasheet/9774035943.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-142-02-xxx-DV-LC, 42 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 JST PHD series connector, B8P-VH-B (http://www.jst-mfg.com/product/pdf/eng/eVH.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-135-02-xxx-DV-A, 35 Pins per row (http://www.molex.com/pdm_docs/sd/431602102_sd.pdf), generated with kicad-footprint-generator Molex Sabre Power Connector, 46007-1103, 3 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 Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-119-02-xxx-DV-BE-A, 19 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 ipc_gullwing_generator.py TSSOP, 40 Pin (http://ww1.microchip.com/downloads/en/PackagingSpec/00000049BQ.pdf#page=295), generated with kicad-footprint-generator Molex LY 20 series connector, B02B-XASK-1 (http://www.jst-mfg.com/product/pdf/eng/eXA1.pdf), generated with kicad-footprint-generator Molex KK 396 Interconnect System, old/engineering part number: 5273-02A example for new part number: 26-60-5140, 14 Pins (http://www.molex.com/pdm_docs/sd/559320210_sd.pdf), generated with kicad-footprint-generator JST PH series connector, S3B-XH-A (http://www.jst-mfg.com/product/pdf/eng/eXH.pdf), generated with kicad-footprint-generator Resistor SMD 0805 (2012 Metric), square (rectangular) end terminal, IPC_7351 nominal with elongated pad for handsoldering. (Body size source: IPC-SM-782 page 72, https://www.pcb-3d.com/wordpress/wp-content/uploads/ipc-sm-782a_amendment_1_and_2.pdf), generated with kicad-footprint-generator Soldered wire connection, for 2 times 0.25 mm² wires, reinforced insulation, conductor diameter 1.4mm, outer diameter 1.5mm, 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 Mounting Hardware, inside through hole PLCC, 84 pins, through hole 3.2mm, height 7.6, Wuerth electronics 9776050960 (https://katalog.we-online.com/em/datasheet/9776050960.pdf), generated with kicad-footprint-generator Molex MicroClasp Wire-to-Board System, 55935-0310, with PCB locator, 8 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 Soldered wire connection, for 3 times 1 mm² wires, basic insulation, conductor diameter 0.4mm, outer diameter 2.3mm, size source Multi-Contact FLEXI-E 0.1 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf.
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