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For schematics and .ino file uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on the CLOCK op-amp from 1 to something more decisive, like 3x. Then a signal as low as 2v could works as an edge cut? Corrected in Rev 2.0 alpha.

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