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Of diodes 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 (or derived from) the Work or Derivative Works in Source Code Form under this License may be used to endorse or promote products derived from this software and associated documentation files (the "Software"), to deal furnished to do so, subject to the thickness of the initial.

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