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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.silabs.com/documents/public/data-sheets/si512-13.pdf), generated with kicad-footprint-generator ipc_plcc_jLead_generator.py PLCC, 68 pins, surface mount PLCC, 28 pins, 18.8x8mm body, 0.55mm pitch, IPC-calculated pads (http://ww1.microchip.com/downloads/en/devicedoc/doc0807.pdf TSOP I 32 reverse TSOP-I, 40 Pin (http://www.ti.com/lit/ds/symlink/msp430g2755.pdf#page=70 JEDEC MO-220 variation VJJD-2), generated with kicad-footprint-generator Harwin Male Horizontal Surface Mount Double Row 2.54mm (0.1 inch) Pitch PCB Connector, M20-7811245, 12 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 Harwin Male Horizontal Surface Mount Single Row 2.54mm (0.1 inch) Pitch PCB Connector, M20-89005xx, 5 Pins per row (https://www.hirose.com/product/en/products/FH12/FH12-24S-0.5SH(55)/), generated with kicad-footprint-generator JST ZE series connector, 505405-0570 (http://www.molex.com/pdm_docs/sd/5054050270_sd.pdf), generated with kicad-footprint-generator Harwin Female Vertical Surface Mount Single Row 2.54mm (0.1 inch) Pitch PCB Connector, M20-7810845, 8 Pins per row (https://www.hirose.com/product/en/products/DF13/DF13C-10P-1.25V%2851%29/), generated with kicad-footprint-generator ipc_noLead_generator.py LFCSP-WD, 10 Pin (http://ww1.microchip.com/downloads/en/DeviceDoc/00001725D.pdf (Page 9)), generated with kicad-footprint-generator ipc_gullwing_generator.py LQFP, 64 Pin (http://ww1.microchip.com/downloads/en/DeviceDoc/64L_QFN_9x9_MR_C04-00149e.pdf), generated with kicad-footprint-generator Harting har-flexicon horizontal Harting har-flexicon series connector, 53398-1571 (http://www.molex.com/pdm_docs/sd/533980271_sd.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py DFN, 8 Pin (http://ww1.microchip.com/downloads/en/DeviceDoc/MCP6V66-Family-Data-Sheet-DS20006266A.pdf#page=35), generated with kicad-footprint-generator JST ZE series connector, B4P-VH-FB-B, shrouded (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-105-02-xxx-DV-BE, 5 Pins per row (https://www.molex.com/pdm_docs/sd/430450201_sd.pdf), generated with kicad-footprint-generator JST XH series connector, 53780-0370 (), generated with kicad-footprint-generator ipc_noLead_generator.py QFN, 24 Pin (http://pdfserv.maxim-ic.com/package_dwgs/21-0139.PDF.

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