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VCF MK's Diode Ladder VCF 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, narrow, oval pads, drill 0.75mm (https://www.diodes.com/assets/Package-Files/TO92S%20(Type%20B).pdf TO-92S_Wide package, drill 0.75mm (see NXP SSOP-TSSOP-VSO-REFLOW.pdf and sot505-1_po.pdf TSSOP, 8 Pin (http://ww1.microchip.com/downloads/en/AppNotes/S72030.pdf), generated with kicad-footprint-generator Molex PicoBlade series connector, (https://www.stocko-contact.com/downloads/steckverbindersystem-raster-2,5-mm.pdf#page=15), generated with kicad-footprint-generator Soldered wire connection with double feed through strain relief, for 5 times 1.5 mm² wires, basic insulation, conductor diameter 0.5mm, outer diameter 3.9mm, size source Multi-Contact FLEXI-xV 0.75 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator Soldered wire connection, for 3 times 1.5 mm² wires, basic insulation, conductor diameter 1.7mm, size source Multi-Contact FLEXI-xV 0.5 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator ipc_gullwing_generator.py TSSOP44: plastic thin shrink small outline package; 14 leads; body width 4.4 mm (see NXP SSOP-TSSOP-VSO-REFLOW.pdf and sot369-1_po.pdf SSOP, 16 Pin (https://assets.nexperia.com/documents/data-sheet/74HC_HCT165.pdf#page=14), generated with kicad-footprint-generator Molex Sabre Power Connector, 46007-1105, 5 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 connector wire 0.25sqmm strain-relief Soldered wire connection, for 3 times outer diameter, generated with kicad-footprint-generator connector Molex Micro-Latch side entry Molex PicoBlade series connector, B10B-ZESK-D (http://www.jst-mfg.com/product/pdf/eng/eZE.pdf), generated with kicad-footprint-generator Diode SMD 0805 (2012 Metric), square (rectangular) end terminal, IPC_7351 nominal, (Body size source: IPC-SM-782 page 76, https://www.pcb-3d.com/wordpress/wp-content/uploads/ipc-sm-782a_amendment_1_and_2.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py QFN, 48 Pin (https://github.com/KiCad/kicad-symbols/pull/1189#issuecomment-449506354), generated with kicad-footprint-generator Molex PicoBlade series connector, B04B-XASK-1-A (http://www.jst-mfg.com/product/pdf/eng/eXA1.pdf), generated with kicad-footprint-generator Molex.

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