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General wiring question for an alternate power source

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Jammin0:
Don't know if you care anymore since it is working and I am no expert but it seems like you should have a diode in there somewhere as I think someone mentioned before.  A diode stops current flow in one direction.  I would worry about back feeding power to your original circuit from the wall wart, especially since it might already be overpowered.  I know you said that it was 12V but have you ever tried reading it with your multimeter?  Not uncommon especially at 1A to have 12V actually read 20V or so without any load.  Your original source might be feeding 20V at 500mA versus your wall wart that is 12V at 1A.  (12 watts versus 10 watts)

Or, I could be completely wrong, like I say, I'm no expert.

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