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NOR gate only works comparing positive voltages and not comparing negative voltages

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danny davis

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NOR GATE U10 only works when the input voltage was comparing Positive voltages, it didn't work when comparing Negative voltages, why?
I changed it and it works now

NOR GATE pic#1.jpg
NOR GATE pic#2.jpg
NOR GATE#3.jpg

What type of RC network is that , what does the Diode do? it discharges the cap?
 

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