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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 top edge. [mm] top_rounding_radius = 8; // Cylinder faces to use for rounding teh top edge. (Other "top rounding.

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