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Back-feeding a LM7805 regulator

Discussion in 'General Electronics Discussion' started by matt99199, Jan 15, 2015.

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  1. matt99199


    Dec 20, 2014
    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?
  2. davenn

    davenn Moderator

    Sep 5, 2009
    well I think a dead or damaged 7805 is a bit of a concern ;)
    Arouse1973 likes this.
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