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Back-feeding a LM7805 regulator

matt99199

Dec 20, 2014
5
Joined
Dec 20, 2014
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5
I was wondering what are some potential problems with back-feeding a LM7805 voltage regulator with 5V from a USB port.
I know I can use a simple diode from the output to the input to counter this but is there any real concern to leave it without a diode?
 
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