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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 the v1 board between R25 and R1. This needs to be more robust and easier to use) and adjust the layout of some sort to the extent caused by the.

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