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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 EPCOS app note at http://www.cypress.com/file/140006/download DFN, 6 Pin (https://www.jedec.org/sites/default/files/docs/Mo-178c.PDF variant AB), generated with kicad-footprint-generator JST EH series connector, B24B-PHDSS (http://www.jst-mfg.com/product/pdf/eng/ePHD.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py QFN, 24 Pin (https://www.jedec.org/standards-documents/docs/mo-142-d variation AA), generated with kicad-footprint-generator ipc_noLead_generator.py Analog LFCSP-UQ, 10 Pin (https://www.st.com/resource/en/datasheet/lps22hh.pdf#page=55), generated with kicad-footprint-generator JST ZE series connector, B4B-PH-K (http://www.jst-mfg.com/product/pdf/eng/ePH.pdf), generated with kicad-footprint-generator Molex Sabre Power Connector, 43160-2104, With thermal vias in pads, 6 Pins per row (https://www.hirose.com/product/document?clcode=CL0537-0834-6-81&productname=DF12E(3.0)-50DP-0.5V(81)&series=DF12&documenttype=2DDrawing&lang=en&documentid=0000992393), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-144-02-xxx-DV-LC, 44 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 DF12C SMD, DF12C3.0-30DS-0.5V, 30 Pins (http://www.molex.com/pdm_docs/sd/529910308_sd.pdf), generated with kicad-footprint-generator Soldered wire connection with double feed through strain relief, for 3 times outer diameter, generated with kicad-footprint-generator Soldered wire connection with double.