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cooling fans

Discussion in 'Electronic Design' started by Dave M., Oct 12, 2004.

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  1. Dave M.

    Dave M. Guest

    Does it make sense to use power supply output power to run it's own cooling
    fan? Isn't that like fanning yourself? Aren't you actually getting hotter?
    Nothing is over 100% efficient.

    I want to add a mini fan to cool an NTE 7046 converter in a TV power supply.
    The fan uses 120-140 milliamps. I'm concerned that the fan will just
    aggravate an already heavy load problem. The other method would be to use
    the relay-switched ac line to power a small transformer, bridge and filter
    for the fan.

    Thoughts?

    Dave M.
     
  2. John Larkin

    John Larkin Guest

    Usually it is, by a big factor. A small amount of electrical power can
    move enough air to do a lot of cooling, especially if the gear is
    already sitting in still air.

    John
     
  3. Dave M.

    Dave M. Guest

    Thanks,

    It turns out I can run a 13.2 volt mini-fan at the TV PS's 8 volt output and
    at only 69ma.
     
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