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MK's Diode Ladder VCF ~$8 in parts, needing only one tl074 and support 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, wide, drill 0.75mm (see NXP sot054_po.pdf TO-92 horizontal, leads molded, wide, drill 0.75mm (see e.g. Https://www.ctscorp.com/wp-content/uploads/206-208.pdf 10x-dip-switch SPST , Slide, row spacing 7.62 mm (300 mils), Socket, LongPads 20-lead though-hole mounted DIP package, row spacing 7.62 mm (300 mils 10-lead surface-mounted (SMD) DIP package, row spacing 9.53.

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