7v from a computer power sorce question

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Discussion in 'General Electronics Chat' started by thetank, Feb 14, 2007.

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  1. Feb 14, 2007 #1
    thetank

    Thread Starter Member

    Feb 13, 2007
    14
    0
    can some one tell me how you can get 7v from a computer power supply by connecting the 12v+ and 5v+ together and not hurt anything?
     
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  2. Feb 14, 2007 #2
    beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    286
    If they do, it won't be true. You might feed an LM317 with the =12 output and use it to supply the +7.
     
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  3. Feb 14, 2007 #3
    n9352527

    AAC Fanatic!

    Oct 14, 2005
    1,198
    5
    Some say that connecting the load between 12V and 5V terminals gives 7V supply (12-5=7). I wouldn't want to bet on how safe this is, probably will work with small load harmlessly as their grounds are shared. Large load would probably not be safe.
     
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  4. Feb 14, 2007 #4
    Porkchop

    Member

    Feb 5, 2007
    17
    0
    It does work the 7V measured it the potential difference.

    Regarding safety i'm not sure. People only use this for running there 12V fans at a lower rpm.

    Id say its bad practice and not a good permant solution but i have never heard and horror story's on the net because of this ?
     
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