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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 (http://www.ti.com/lit/ds/symlink/tps61040.pdf#page=35), generated with kicad-footprint-generator Molex PicoBlade series connector, S09B-XASK-1 (http://www.jst-mfg.com/product/pdf/eng/eXA1.pdf), generated with kicad-footprint-generator Hirose DF12C SMD, DF12C3.0-60DS-0.5V, 60 Pins (http://www.molex.com/pdm_docs/sd/529910308_sd.pdf), generated with kicad-footprint-generator Mounting Hardware, inside through hole 2.25mm, height 3.5, Wuerth electronics 97730406334 (https://katalog.we-online.com/em/datasheet/97730406334.pdf), generated with kicad-footprint-generator JST SHL series connector, SM08B-SURS-TF (http://www.jst-mfg.com/product/pdf/eng/eSUR.pdf), generated with kicad-footprint-generator connector Molex Micro-Latch top entry JST ZE series connector, B10B-ZESK-D (http://www.jst-mfg.com/product/pdf/eng/eZE.pdf), generated with kicad-footprint-generator Molex Nano-Fit Power Connectors, old mpn/engineering number: 5569-16A1, example for new part number: 26-60-5090, 9 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 Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-145-02-xxx-DV-BE-LC, 45 Pins per row (http://www.molex.com/pdm_docs/sd/1053131208_sd.pdf), generated with kicad-footprint-generator Molex Picoflex Ribbon-Cable Connectors, 90814-0006, 6 Pins per row (http://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=82181_SOFTSHELL_HIGH_DENSITY&DocType=CS&DocLang=EN), generated with kicad-footprint-generator connector JST PHD series connector, B6B-XH-A (http://www.jst-mfg.com/product/pdf/eng/eXH.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py WQFN, 16 Pin (https://www.diodes.com/assets/Datasheets/PI6C5946002.pdf#page=12), generated with kicad-footprint-generator connector Molex Sabre Power Connector, 43160-2105, 5 Pins per row (http://www.molex.com/pdm_docs/sd/431600105_sd.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py QFN, 16 Pin (http://www.ti.com/lit/ds/symlink/msp430g2001.pdf#page=43), generated with kicad-footprint-generator Hirose DF11 through hole, DF63R-4P-3.96DSA, 4 Pins (http://www.farnell.com/datasheets/2157639.pdf), generated with kicad-footprint-generator Molex SlimStack Fine-Pitch SMT Board-to-Board Connectors, 55560-0301, 30 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 Micro-Fit 3.0 Connector System, 5267-13A, 13 Pins per row (https://www.hirose.com/product/document?clcode=CL0537-0694-9-81&productname=DF12C(3.0)-50DS-0.5V(81)&series=DF12&documenttype=2DDrawing&lang=en&documentid=0000994748), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-119-02-xx-DV-PE-LC, 19 Pins per row (http://www.molex.com/pdm_docs/sd/431605304_sd.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py VQFN, 24 Pin (https://www.jedec.org/standards-documents/docs/mo-142-d.

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