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BackIs ~$16-20 in parts, needing only one tl074 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.
- (https://www.phoenixcontact.com/online/portal/gb/?uri=pxc-oc-itemdetail:pid=1719354), generated with kicad-footprint-generator JST PH.
- Normal 0.362633 0.421912 0.830956 vertex -4.72589 -5.62591.
- 2.588152e-001 facet normal -0.992167.