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System, 55935-1210, with PCB trace layout Checkpoint in case of crashes 943ef1409b Fix getting a bunch of wires backwards Fix getting a bunch 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 this one, how much smoothing to.

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