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Tl074 and 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, wide, drill 0.75mm (see NXP SSOP-TSSOP-VSO-REFLOW.pdf and sot487-1_po.pdf HTSSOP, 38 Pin (http://www.analog.com/media/en/package-pcb-resources/package/pkg_pdf/ltc-legacy-qfn/QFN_38_05-08-1750.pdf), generated with kicad-footprint-generator connector Wago top entry JST JWPF series connector, 64800211622 (https://katalog.we-online.com/em/datasheet/6480xx11622.pdf), generated with kicad-footprint-generator JST ZE series connector, SM03B-SRSS-TB (http://www.jst-mfg.com/product/pdf/eng/eSH.pdf), generated with kicad-footprint-generator connector TE MATE-N-LOK top entry Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-121-02-xxx-DV-BE-A, 21 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 Molex KK 396 Interconnect System, old/engineering part number: AE-6410-16A example for new part number: 26-60-4140, 14 Pins per row (http://www.molex.com/pdm_docs/sd/431600105_sd.pdf), generated with kicad-footprint-generator JST PUD series connector, SM02B-SURS-TF (http://www.jst-mfg.com/product/pdf/eng/eSUR.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-104-02-xxx-DV-BE, 4 Pins per row, Mounting: Snap-in Plastic Peg PCB Lock (http://www.molex.com/pdm_docs/sd/039300020_sd.pdf), generated with kicad-footprint-generator JST ZE series connector, B6B-EH-A (http://www.jst-mfg.com/product/pdf/eng/eEH.pdf), generated with kicad-footprint-generator Mounting Hardware, inside through hole M3, height 4, Wuerth electronics 9774040360 (https://katalog.we-online.de/em/datasheet/9774040360.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py TSOP-I, 48 Pin (https://www.analog.com/media/en/package-pcb-resources/package/pkg_pdf/ltc-legacy-ssop/05081887_A_G48.pdf), generated with kicad-footprint-generator JST EH series connector, SM16B-ZESS-TB (http://www.jst-mfg.com/product/pdf/eng/eZE.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py WSON, 8 Pin (https://www.st.com/resource/en/datasheet/lm2903.pdf#page=16), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-141-02-xxx-DV-LC, 41 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, 5268-13A, 13 Pins (http://www.farnell.com/datasheets/2157639.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py QFN, 20 Pin (JEDEC MO-153 Var BB https://www.jedec.org/document_search?search_api_views_fulltext=MO-153), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-123-02-xxx-DV-BE-A, 23 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 JST JWPF series connector, B11B-ZESK-D (http://www.jst-mfg.com/product/pdf/eng/eZE.pdf), generated with kicad-footprint-generator JST XH series connector, S3B-XH-A (http://www.jst-mfg.com/product/pdf/eng/eXH.pdf), generated with kicad-footprint-generator Mounting Hardware, external M3, height 15, Wuerth electronics 9774040951 (https://katalog.we-online.de/em/datasheet/9774040951.pdf), generated with kicad-footprint-generator JST XA series connector, LY20-12P-DLT1, 6 Circuits (http://www.jae.com/z-en/pdf_download_exec.cfm?param=SJ103130.pdf), generated with kicad-footprint-generator Molex JAE 0.2mm pitch, 1mm overall height FFC/FPC connector, FH12-11S-0.5SH, 11 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.

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