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Many thanks GCAUSE, I appreciate your advice, I will check that :) Cheers

Hi Guys, I recently reproduced (copy) the SURF PI 1.2 KIT on a prototype PCB, based on the Original Schematic. But the only way to let it working well, is to put a 10K Resistor (as a Pull-Down) between pin8 of U4 (4093) and the GND, and I am not satisfied about that, because I really want to...