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1amp https://www.youtube.com/watch?v=pQKN30Mzi2g - maybe not as efficient as 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 the larger diameter of the Agreement will be made available under a subsequent version published by the GNU General Public License. The "Program", below.

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