Re: Lisa Fans (was Re: Question about Sun Rem SCSI card)

So on a stock Lisa, would it make sense to try to add a fan to the card cage? What's the biggest power consumer? I've never noticed the vents above the card cage feeling extremely "hot", but I know that there could still be some hot spots inside.

I added a fan to my power supply - one which runs almost silently on the 5v supply. There's some gentle warm air coming out of the top vents, so I'd think it's doing its job.

Thanks!

-J

On Sunday, July 27, 2008 at 4:48:56 PM UTC-4, James MacPhail wrote:
>
>
> >pic of card cage fan installed
>
> <http://www.lisa2.com/XLerator.html>
>
> (Thanks for the pics Rick!)
>
> Although the added card cage fan is in a position that will cool the memory
> boards, AFAIK they do not require anything more than convection cooling.
>
> The primary purpose of the card cage fan is to cool the XLerator. It was
> required for the original 16 MHz XLerator and the XLerator 18. It is not
> usually required for the XLerator 12.5, but if the ambient temperature is
> high it would be a good idea.
>
> >All of this leads me to believe that it is prudent to have forced cooling
> >(a fan) with the Lisa, contrary to what I've read elsewhere
>
> I believe that nearly any electronic device that runs hot will last longer
> with additional cooling. My rule of thumb is that any part that is "too hot
> to hold your finger on" needs more cooling. That threshold is about 50
> degrees celcius and seems to be fairly consistent from person to person.
>
> As Ray said, the power supply seems to be the most vulnerable item in the
> Lisa, so I try to always have a fan cooling it.
>
> Since the cooling effect of moving air is in proportion to the square of
> the velocity (IIRC), even a very gentle (and thus quiet) airflow makes a
> big difference in temperature for something that was originally convection
> cooled.
>
> I see that this thread has gone way off subject, so I have changed the
> subject line to make the archives more useful.
>
> HTH,
>
> James
>
>
>

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