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amperage question

Discussion in 'Electronic Basics' started by Jeremy, Apr 8, 2006.

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  1. Jeremy

    Jeremy Guest

    I have a cpu fan which is rated 12v dc 0.06A can I run it in my truck or
    will it burn out?
     
  2. w2aew

    w2aew Guest

    Jeremy,
    You should be able to run it OK. The voltage in your truck will be
    closer to 13.8V when running, and nearer to 12.5V when off. Most 12Vdc
    fans can operate at these slightly higher voltages without a problem.
    To be absolutely sure, you can check the manufacturer's specs. If you
    don't know how to do that, post the manufacturer and part number here,
    and someone here will look it up and let you know for sure. The
    manufacturer and part number are located on the label in the center of
    the fan motor.
     
  3. Tom Biasi

    Tom Biasi Guest

    As long as your truck is 12 Volts.
     
  4. ptw

    ptw Guest

    CPU fan can work from as low as 8 volts, so a few volts above 12 v can
    be too much. I would definitely stick a voltage regulator.


    (+) ------- [7812] ---------+
    | |
    | [FAN]
    | |
    (-) -----------+------------+


    [7812] is the part number for regulator. An example is L7812CV.
     

  5. The 7812 needs 14 to 15 volts on the input to regulate.


    --
    Service to my country? Been there, Done that, and I've got my DD214 to
    prove it.
    Member of DAV #85.

    Michael A. Terrell
    Central Florida
     
  6. ptw

    ptw Guest

    Well, it works for me in practice. See for yourself:

    http://img323.imageshack.us/img323/3856/img07445ua.jpg
    http://img323.imageshack.us/img323/6028/img07460fj.jpg
     
  7. ehsjr

    ehsjr Guest

    The regulator is obviously not regulating, in your
    photos. He could accomplish the same thing a whole
    lot cheaper with a resistor or three diodes.

    Ed
     
  8. If the voltage is less then 12 volts out then the 7812 is simply a resistor
    dropping the voltage.
    Why even use it in the first place?
     
  9. It will be happy there...
     
  10. Rich Grise

    Rich Grise Guest

    I'd also, on the off-chance that's it a brushless DC motor, put about
    a transzorb across the input, like a 16V or so, and probably a hash
    choke (that's just an inductor that can handle the DC current without
    saturating.)

    Automotive electric systems are hell on electronics.

    Good Luck!
    Rich
     
  11. redbelly

    redbelly Guest

    Because when the voltage goes much above 12V, the regulator will go
    into regulate-mode and protect the fan.

    Mark
     
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