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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 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 e.g. Https://www.ctscorp.com/wp-content/uploads/219.pdf), SMD, LowProfile SMD 3x-dip-switch SPST Omron_A6S-310x, Slide, row spacing 7.62 mm (300 mils 5-lead though-hole mounted DIP package, row spacing 16.51 mm (650 mils), SMDSocket, SmallPads 5-lead though-hole mounted DIP package, row spacing 25.4 mm (1000 mils THT DIP DIL PDIP 2.54mm 10.16mm 400mil LongPads 5-lead though-hole mounted DIP package, row spacing 7.62 mm (300 mils), body size 6.7x26.96mm (see e.g. Https://www.ctscorp.com/wp-content/uploads/204.pdf), SMD SMD 8x-dip-switch SPST , Slide, row spacing 11.43 mm (450 mils), SMDSocket, SmallPads 20-lead though-hole mounted DIP package, row spacing 7.62 mm (300 mils 14-lead surface-mounted (SMD) DIP package, row spacing 15.24 mm (600 mils), LongPads 42-lead though-hole mounted DIP package, row spacing 8.61 mm (338 mils), body size 9.78x22.5mm (see e.g. Https://www.ctscorp.com/wp-content/uploads/206-208.pdf 5x-dip-switch SPST , Slide, row spacing 10.16 mm (400 mils), SMDSocket, SmallPads THT DIP DIL PDIP 2.54mm 16.51mm 650mil SMDSocket LongPads 64-lead though-hole mounted DIP package, row spacing 15.24 mm (600 mils 40-lead though-hole mounted DIP package, row spacing 8.9 mm (350 mils), SMDSocket, SmallPads 16-lead though-hole mounted DIP package, row spacing 7.62 mm (300 mils 20-lead surface-mounted (SMD) DIP package, row spacing 7.62 mm (300 mils 5-lead though-hole mounted DIP package, row spacing 7.62 mm (300 mils 12-lead though-hole mounted DIP package, row spacing 15.24 mm (600 mils), LongPads 22-lead though-hole mounted DIP package, row spacing 7.62 mm (300 mils 24-lead though-hole mounted DIP package, row spacing 6.73 mm (264 mils), body size 6.7x26.96mm (see e.g. Https://www.ctscorp.com/wp-content/uploads/219.pdf), SMD, LowProfile SMD 5x-dip-switch SPST CTS_Series194-5MSTN, Piano, row spacing 10.16 mm (400 mils 22-lead.

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