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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.schmitzbits.de/ms20.html which is a work in progress; better README to come soon. Meanwhile: **Untested hardware and software — Do not connect the Normal pin for op amp Fix floating pin for op amp 54f1a61ba5 gets jiggy with PCB locator, 12 Pins (http://www.molex.com/pdm_docs/sd/559350210_sd.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-150-02-xxx-DV-BE, 50 Pins per row (https://cdn.harwin.com/pdfs/M20-781.pdf), generated with kicad-footprint-generator Molex Sabre Power Connector, 43160-0102, 2 Pins (https://www.molex.com/pdm_docs/sd/026604020_sd.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py 32-Lead Frame Chip Scale Package - 10x10x0.9 mm Body [DFN] (see Microchip Packaging Specification 00000049BS.pdf DFN, 8 Pin (https://www.onsemi.com/pub/Collateral/NB3N551-D.PDF#page=7), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-141-02-xxx-DV-A, 41 Pins per row (https://www.hirose.com/product/en/products/DF13/DF13C-10P-1.25V%2851%29/), generated with kicad-footprint-generator ipc_gullwing_generator.py 6-pin TSOT23 package, http://cds.linear.com/docs/en/packaging/SOT_6_05-08-1636.pdf TSOT-23-6 MK06A TSOT-6 Hand-soldering TSOT, 8 Pin (https://www.nxp.com/docs/en/data-sheet/TJA1051.pdf#page=16), generated with kicad-footprint-generator Harting har-flexicon series connector, 502382-0670 (http://www.molex.com/pdm_docs/sd/5023820270_sd.pdf), generated with kicad-footprint-generator crystal Epson Toyocom FA-238 series https://support.epson.biz/td/api/doc_check.php?dl=brief_fa-238v_en.pdf, hand-soldering, 3.2x2.5mm^2 package SMD Crystal Oscillator Seiko Epson SG-8002CE https://support.epson.biz/td/api/doc_check.php?mode=dl⟨=en&Parts=SG-8002DC, hand-soldering, 14.0x8.7mm^2 package SMD Crystal MicroCrystal CC5V-T1A series http://cdn-reichelt.de/documents/datenblatt/B400/CC5V-T1A.pdf, 4.1x1.5mm^2 package SMD Crystal MicroCrystal CC7V-T1A/CM7V-T1A series https://www.microcrystal.com/fileadmin/Media/Products/32kHz/Datasheet/CC7V-T1A.pdf, 3.2x1.5mm^2 package SMD Crystal 2012/2 http://txccrystal.com/images/pdf/9ht11.pdf, 2.0x1.2mm^2 package SMD Crystal Oscillator Seiko Epson SG-8002JA https://support.epson.biz/td/api/doc_check.php?mode=dl&lang=en&Parts=SG-8002DC, hand-soldering, 3.2x2.5mm^2 package Miniature Crystal Clock Oscillator TG2520 series, https://support.epson.biz/td/api/doc_check.php?dl=app_TG2520SMN⟨=en Miniature Crystal Clock Oscillator TXCO Fordahl DFA S3-KS/LS/US, http://www.iqdfrequencyproducts.com/products/details/iqxo-70-11-30.pdf, 9.1x7.2mm^2 package Miniature Crystal Clock Oscillator TXCO Fordahl DFA S2-KS/LS/US, http://www.iqdfrequencyproducts.com/products/details/iqxo-70-11-30.pdf, 7.3x5.1mm^2 package Mminiature Crystal Clock Oscillator Abracon ASV series, http://www.abracon.com/Oscillators/ASV.pdf, hand-soldering, 7.0x5.1mm^2 package FN Series Crystal Clock Oscillator TXCO Fordahl DFA S3-KS/LS/US, http://www.iqdfrequencyproducts.com/products/details/iqxo-70-11-30.pdf, 9.1x7.2mm^2 package Miniature Crystal Clock Oscillator TXCO Fordahl DFA S11-OV/UOV, http://www.iqdfrequencyproducts.com/products/details/iqxo-70-11-30.pdf, hand-soldering, 5.0x3.2mm^2 package 14-lead dip package, row spacing 7.62 mm (300 mils), body size (see http://www.kingtek.net.cn/pic/201601201446313350.pdf), JPin SMD 2x-dip-switch SPST , Slide, row spacing 7.62 mm (300 mils 10-lead surface-mounted (SMD) DIP package, row spacing 8.89 mm (350 mils), SMDSocket, LongPads 32-lead dip package, row spacing 9.53 mm (375 mils), Clearance8mm 18-lead surface-mounted (SMD) DIP package, row spacing 15.24 mm (600 mils), http://multimedia.3m.com/mws/media/494546O/3mtm-dip-sockets-100-2-54-mm-ts0365.pdf 3M 22-pin zero insertion force socket, through-hole, row spacing 15.24 mm (600 mils 32-lead surface-mounted (SMD) DIP package, row spacing 6.73 mm (264 mils), body size (see http://www.nidec-copal-electronics.com/e/catalog/switch/chs.pdf), SMD, JPin SMD 4x-dip-switch SPST , Slide, row spacing 7.62 mm (300 mils), body size (see https://www.omron.com/ecb/products/pdf/en-a6h.pdf SMD 10x-dip-switch SPST , Slide, row spacing 7.62 mm (300 mils), body size (see http://omronfs.omron.com/en_US/ecb/products/pdf/en-a6s.pdf SMD 11x-dip-switch SPST , Slide, row spacing.

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