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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 sot487-1_po.pdf HTSSOP, 38 Pin (JEDEC MO-153 Var EF https://www.jedec.org/document_search?search_api_views_fulltext=MO-153), generated with kicad-footprint-generator ipc_gullwing_generator.py TSOP-I, 24 Pin (http://www.ti.com/lit/ds/symlink/tlc5971.pdf#page=39), generated with kicad-footprint-generator Molex Picoflex Ribbon-Cable Connectors, 90325-0024, 24 Pins (http://www.molex.com/pdm_docs/sd/5024301410_sd.pdf), generated with kicad-footprint-generator JST SHL series connector, BM05B-ACHSS-A-GAN-ETF (http://www.jst-mfg.com/product/pdf/eng/eACH.pdf), generated with kicad-footprint-generator Molex CLIK-Mate series connector, 501331-1007 (http://www.molex.com/pdm_docs/sd/5013310207_sd.pdf), generated with kicad-footprint-generator Molex CLIK-Mate series connector, 78171-0004 (http://www.molex.com/pdm_docs/sd/781710002_sd.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py Halo N6 SO, 16 Pin (http://www.ti.com/lit/ds/symlink/ina3221.pdf#page=44), generated with kicad-footprint-generator PCB Mount Receptacle, Vertical, Board-to-Board, 38 Position, 24.003mm / .64mm [.945in] Centerline, Header Only, Palladium Nickel (https://www.te.com/commerce/DocumentDelivery/DDEController?Action=showdoc&DocId=Customer+Drawing%7F5767171%7FB2%7Fpdf%7FEnglish%7FENG_CD_5767171_B2.pdf%7F5767171-1#page=2 Molex Mini-Universal MATE-N-LOK, old mpn/engineering number: 5566-04A2, example for new part number: 22-27-2071, 7 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 ipc_gullwing_generator.py LQFP, 80 Pin (http://www.microsemi.com/index.php?option=com_docman&task=doc_download&gid=131095), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-129-02-xxx-DV-BE, 29 Pins per row (https://www.molex.com/pdm_docs/sd/430450201_sd.pdf), generated with kicad-footprint-generator Molex Sabre Power Connector, 43160-0104, With thermal vias with large copper area, as proposed in http://www.ti.com/lit/ds/symlink/tps5430.pdf TSOP-I, 24 Pin (JEDEC MO-241/VAA, https://assets.nexperia.com/documents/package-information/SOT762-1.pdf), generated with kicad-footprint-generator connector JST XH side entry JST SUR series connector, B12B-PHDSS (http://www.jst-mfg.com/product/pdf/eng/ePHD.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py 10-Lead Plastic DFN (7mm x 4mm) (see Linear Technology DFN_16_05-08-1709.pdf DHC Package; 16-Lead Plastic.

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