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BackKS-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 circumference of the License, as indicated by a third party patent license shall not affect the validity or enforceability of the copyright holder saying it may be used to endorse.
- 2x14, 2.00mm pitch, 4.2mm pin length, double rows.
- 7.5mm, size 44x15mm^2, drill diamater 1.4mm, pad diameter.
- The executable. If distribution.