7812 12V regulator

Discussion in 'General Electronics Chat' started by Jigawat, Feb 4, 2009.

  1. Jigawat

    Thread Starter New Member

    Feb 4, 2009
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    0
    Hi, I'm working on a simple circuit and am having an unexpected problem. When connecting just the 7812 it is heating hot enough to burn skin as soon as I apply power. There is no short on the output. I'm applying power from a DC wall transformer that is rated for 12V DC out but it gives me 15Vdc when I check it with my meter.

    Do I need to have a load on this IC? I'm really not sure what's up. I've tried two different ICs now. Any reason anyone could think of as to why I'm having this problem?

    Thanks I appreciate it.
     
  2. Jigawat

    Thread Starter New Member

    Feb 4, 2009
    5
    0
    Haha... wow. Nevermind. I'm a dummy. I must not be fully awake because I thought I felt a rib on the wire of my transformer and assumed it was negative but it was the positve. So I was applying the voltage in reverse.

    What a great first post..... hah .. life and learn.
     
  3. Wendy

    Moderator

    Mar 24, 2008
    20,766
    2,536
    And buy a new part? It happens.
     
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