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BackSupport 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 top of the board, connecting a trace on one side when convenient. You can obtain a copy Copyright (c) 2013 Julian Gruber
- Normal 0.305573 -0.114506 0.945258 facet.
- Normal -7.499905e-01 4.160305e-03 6.614355e-01 vertex -1.083551e+02.
- Vertex 3.439994e+000 3.872894e+000 2.484855e+001 facet normal 0.63014 -0.772994.
- -8.07502 0 5.88782 vertex 7.91987 1.57536 5.88782.
- 9.715134e+01 1.086671e+01 vertex -1.052173e+02 9.695134e+01.