🚀 go-pugleaf

gdurb@aardvark.apana.org.au (George Durbridge) wrote:

>Matthew McDonald (firstnamehere@sv.net.au) wrote:
>: "BOB" <Yeah@right.com> wrote:
>
>: >I have got an old large fliptop case which i am thinking of doing up.
>: >And the first thing that has to go is the ancient and very large power
>: >supply.
>: >There is already one large fan hole in the back, but for me to make use of
>: >it a normal modern AT type power supply would have to go in upside down.
>: >Is this safe/possible etc?
>
>: I would not recommend this for a few reasons.
>
>: One is the heat, even with the fan running you still get a fair bit of
>: heat and with the power supply upside down the heat will go straight
>: back into the board.
>
>: The other is the components themselves, especially with cheaper power
>: supplies the heat generated and going straight back into the boards
>: could cause components to come loose or cause dry joints etc.

>I think the original poster wanted to install the power supply upside 
>down, not the case.  Installing the case with the PS at the bottom might 
>have the effects you describe, but that's a funny way to use a fliptop 
>case.  Since the fan draws air through the middle of the PS, and seems 
>not to rely on convection, the PS should work OK upside down.

I'm quite sure that a quality power supply with a decent fan would work
fine, but what about all the crap out there? I've seen some pretty bad
units. Here's one scenario out of many that _could_ happen.

Fan starts running slow, heat builds up, heat rises, straight back into
the board that's mounted at the top, components are all held in by poor
soldering, components come loose, intermittent operation begins or
worse.

There are many other reasons as well, power supplies are designed to be
operated in a few positions but upside down is not one of them, whilst
it may work, I would not take the chance.

-- 
______________________________________________________________
Matthew McDonald	                  Brisbane, Queensland

http://www.starvision.net/matthew/
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