Re: Real time?

["Scott Stephens" <Scott2-at-Mediaone.net>]

Very sorry I said that! Those switching power supplies and many other
appliances like TV's have hot switching supply components. Dont touch them
when they are plugged in or you may get a lethal shock.

-----Original Message-----
From: Jon Elson <jmelson-at-artsci.wustl.edu>
To: Multiple recipients of list <emc-at-nist.gov>
Date: Monday, September 25, 2000 2:28 PM
Subject: Re: Real time?
>
>Scott Stephens wrote:
>
>> failed. You would need extra large heat sinks for a few parts (just pop
the
>> top and feel the hot ones;
>
>This is a very dangerous suggestion!  There is 400 V DC in these power
>supplies!  That can definitely kill you!  The capacitor bank can stay
charged
>to some significant voltage for several minutes.
>
>Well, it is possible to make the power supply fanless, and silent, but
>there are so many hot spots on the motherboard that it is not going
>to be easy to make that run without airflow.

That app note I spoke of demonstrated the air flow inside the PC, which was
in large part due to the supply cooling fan. Just this last week I've been
running my PC with the case off and my Quantum "Fireball" (appropriately
named!) disk drive has been crashing due to a chip overheating. A little
heat sink compound and a heat sink has fixed it. The disk drive was in a
flow with the case on, but gets less cooling air with the case off.

> Many, if not most, new
>VGA cards need airflow to prevent overheating.

I put a fan on my Permedia 2 card so I can overclock it.

> Apparently the CPU fan just keeps recirculating the same
>hot air without some help to drive the hot air away.

An air path into and out of the PC is necessary, the point of the app note
was video chips should be placed in an external airflow rather than a
recirculating flow.

Scott