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Via skywiring; only one 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 EPCOS app note at http://www.cypress.com/file/140006/download DFN, 6 Pin (https://www.analog.com/media/en/package-pcb-resources/package/pkg_pdf/ltc-legacy-dfn/(DCB6)%20DFN%2005-08-1715%20Rev%20A.pdf), generated with kicad-footprint-generator Tantalum Capacitor SMD Kemet-C (6032-28 Metric), IPC_7351 nominal, (Body size from: http://www.kemet.com/Lists/ProductCatalog/Attachments/253/KEM_TC101_STD.pdf), generated with kicad-footprint-generator JST XA series connector, BM10B-SRSS-TB (http://www.jst-mfg.com/product/pdf/eng/eSH.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py DFN8 2x2, 0.5P; No exposed pad (http://www.onsemi.com/pub/Collateral/NCP4308-D.PDF WDFN, 12 Pin (https://www.nxp.com/docs/en/data-sheet/MMZ09332B.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py SOIC, 20 Pin (https://www.silabs.com/documents/public/data-sheets/Si5351-B.pdf), generated with kicad-footprint-generator Mounting Hardware, inside through hole M2, height 1, Wuerth electronics 9774050243 (https://katalog.we-online.de/em/datasheet/9774050243.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-112-02-xxx-DV-LC, 12 Pins per row (https://www.molex.com/pdm_docs/sd/430450221_sd.pdf), generated with kicad-footprint-generator JST SUR series.

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