Diode Oring

Discussion in 'General Electronics Chat' started by anurag jain, Jun 12, 2014.

  1. anurag jain

    Thread Starter New Member

    Jun 12, 2014
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    In the analog world, the higher of the 2 input voltages will be passed to the output, and the lower one will be ignored. What is the reason for this.
     
  2. tshuck

    Well-Known Member

    Oct 18, 2012
    3,531
    675
    ...because of how diodes work... They allow current to flow in one direction, so the higher voltage will reverse bias the diode on the lower voltage supply, meaning very little current will flow through it.

    See the article on diodes in the eBook
     
  3. ErnieM

    AAC Fanatic!

    Apr 24, 2011
    7,388
    1,605
    Two words: reverse bias.

    Take your schematic and write in all the voltage drops with polarity. You should see the "lower one" is reversed biased and not conducting.
     
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