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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 the https://www.onsemi.com/pub/Collateral/NCP115-D.PDF Panasonic HQFN-16, 4x4x0.85mm (https://industrial.panasonic.com/content/data/SC/ds/ds7/c0/PKG_HQFN016-A-0404XZL_EN.pdf Panasonic HSON-8, 8x8x1.25mm (https://industrial.panasonic.com/content/data/SC/ds/ds7/c0/PKG_HSON008-A-0808XXI_EN.pdf QFN, 12 Pin (https://www.diodes.com/assets/Datasheets/PAM2306.pdf), generated with kicad-footprint-generator Molex SPOX Connector System, 43045-2421 (alternative finishes: 43045-040x), 2 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 ipc_gullwing_generator.py TSSOP, 64 Pin (http://ww1.microchip.com/downloads/en/DeviceDoc/doc7593.pdf (page 432)), generated with kicad-footprint-generator Soldered wire connection with double feed through strain relief, for 2 times 0.25 mm² wires, basic insulation, conductor diameter 0.9mm, outer diameter 4.4mm, size source Multi-Contact FLEXI-xV 2.0 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator JST XA series connector, 53261-1771 (http://www.molex.com/pdm_docs/sd/532610271_sd.pdf), generated with kicad-footprint-generator Molex Molex 0.30mm Pitch Easy-On BackFlip Type FFC/FPC, 502250-3991, 39 Circuits (http://www.molex.com/pdm_docs/sd/5022503991_sd.pdf), generated with kicad-footprint-generator Mounting Hardware, inside through hole 4.5mm, height 8, Wuerth electronics 97730456330 (https://katalog.we-online.com/em/datasheet/97730456330.pdf), generated with kicad-footprint-generator JST GH series connector, 501331-0507 (http://www.molex.com/pdm_docs/sd/5013310207_sd.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-145-02-xxx-DV-BE, 45 Pins per row, Mounting: Snap-in Plastic Peg PCB Lock (http://www.molex.com/pdm_docs/sd/039289068_sd.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py 32-lead plastic TSOP; Type II TSOP-II, 44 Pin (http://ww1.microchip.com/downloads/en/DeviceDoc/2512S.pdf#page=17), generated with kicad-footprint-generator ipc_gullwing_generator.py TSSOP, 36 Pin (http://www.ti.com/lit/ds/slvsba5d/slvsba5d.pdf#page=35), generated with kicad-footprint-generator Molex PicoBlade Connector System, 5267-10A, 10 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⟨=en&documentid=0000994748), generated with kicad-footprint-generator JST PUD series connector, B18B-XASK-1 (http://www.jst-mfg.com/product/pdf/eng/eXA1.pdf), generated with kicad-footprint-generator connector wire 0.75sqmm double-strain-relief Soldered wire connection with double feed through strain relief, for 3 times outer diameter, generated with kicad-footprint-generator ipc_gullwing_generator.py FE Package; 16-Lead Plastic DFN (2mm x 2mm), http://ams.com/eng/content/download/950231/2267959/483138 DD Package; 8-Lead Plastic PSOP, Exposed Die Pad (see Microchip Packaging Specification 00000049BS.pdf DFN, 8 Pin (https://www.analog.com/media/en/technical-documentation/data-sheets/2451fg.pdf#page=17), generated with kicad-footprint-generator connector wire 2sqmm double-strain-relief Soldered wire connection with double feed through strain relief, for 3 times.

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