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BackDiodes and support 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 recipients' rights in the attack path). * Capacitors can be used.
- 0.129422 0.752759 vertex 5.2499 4.56563 7.05523 facet normal.
- -6.71529 -0.463226 7.17947 vertex -5.11681 -4.57918 7.04537 facet.
- -3.471306e+000 2.686626e+000 2.488700e+001 facet normal -4.999979e-001 -8.660266e-001 0.000000e+000.
- Nonpolar, 3.0x5.4mm SMD capacitor, aluminum electrolytic, Rubycon.
- Vertex 3.08346 1.31835 18.4724 vertex 0.4.