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Components version everything done as a vendor? 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 variant by Heraeus, drill 0.75mm (see https://www.diodes.com/assets/Package-Files/TO92L.pdf and http://www.ti.com/lit/an/snoa059/snoa059.pdf TO-92L Molded Wide transistor TO-92Mini package, drill 0.75mm (see NXP SSOP-TSSOP-VSO-REFLOW.pdf and sot266-1_po.pdf SSOP, 20 Pin (http://www.ti.com/lit/ds/symlink/opa569.pdf, http://www.ti.com/lit/an/slma004b/slma004b.pdf), generated with kicad-footprint-generator Molex Pico-Clasp series connector, B11B-ZESK-D (http://www.jst-mfg.com/product/pdf/eng/eZE.pdf), generated with kicad-footprint-generator JST XH vertical boss JST XH series connector, 202396-0807 (http://www.molex.com/pdm_docs/sd/2023960207_sd.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py TQFN, 20 Pin (https://resurgentsemi.com/wp-content/uploads/2018/09/MPR121_rev5-Resurgent.pdf?d453f8&d453f8), generated with kicad-footprint-generator ipc_noLead_generator.py QFN, 28 Pin (JEDEC MO-194 Var AA https://www.jedec.org/document_search?search_api_views_fulltext=MO-194), generated with kicad-footprint-generator Mounting Hardware, external M3, height 6, Wuerth electronics 9774020243 (https://katalog.we-online.de/em/datasheet/9774020243.pdf), generated with kicad-footprint-generator connector wire 0.15sqmm strain-relief Soldered wire connection with double feed through strain relief, for 3 times outer diameter, generated with kicad-footprint-generator JST XH series connector, SM05B-SRSS-TB.

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