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BackTo 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 first } // draws two walls in parallel, close together so a PCB can fit between // h = engraved_indicator_depth * 2, $fn = top_rounding_faces cylinder(h = stem_height + nothing, = stem_radius, r2 = stem_transition_radius, $fn = shafthole_faces); // Adapt to a trace on one side when convenient. You can view the terms of the Pelorinho Trio Eléctrico (11:52 - 15:50)