Chip operating temperatures

[Robert Harris]

All I know is the crap that I find in repairing brand name 
PC's such as Packaged Hell, IBM, Dell, Gateway and
Huo Fwung Dung Clones.  The boards are dog shit and
don't last unless dey ain't been fusted with.  Since shop
labor rates start at $45.00 an hour and my on site rate is
$75.00 an hour, I really don't either try to repair them or
determine wether there is a hairline crack or the component
joint failed.  I don't care - it don't work, its a tosser.  The
customer don't want to spend 45 bucks an hour - open 
end to find and fix a hairline crack on a PC.

And I guess these must be the cheap radio shack boards
because if you try bending them - they break rat now - real
easy.  Yes I have seen some wazoo mil-spec shit out there
last forever - mostly used on airplanes older than the pilots.
I am currently working a contract as an software integration
engineer on a Methuselah bird, so if they is done right, I 
know they can last. 

Point is, was that the whole damned assembly is much more
prone to failure from vibration and heat than the components 
themselves.  Move it to human comfort zone and just avoid all
the problems.

Side note - ever see the sci fi "Plasma Storms" or whatever. That
is sort of what the EMF environment is under the hood of a car.
Each time a plug fires there is an extreme amount of energy
generated from dc up into the microwave region.  Used to call
it spark gap transmission - thats how Marconi made his first 
wireless transmission across the Atlantic. There is a rotating ball
of EMF around the alternator and kicking the starter over - does
the word EMP mean anything?  Give you a clue - it's the pulse
from a nuclear event that fries the insides of devices electronic.
It's simulated by a large current released thru an inductor - sort
of like the collapsing field of a starter motor. 

If you can get your electronics out of that extremely hostile EMF
environment - say by putting a grounded metal firewall between
it and your computer, you will save one hell of a lot of time sorting
between real data and random induced noise. Also don't forget to
filter the DC as those lines carry a LOT of induced noise.

> From: tom cloud <cloud at peaches.ph.utexas.edu>
> To: diy_efi at coulomb.eng.ohio-state.edu
> Subject: Re: Chip operating temperatures
> Date: Tuesday, September 24, 1996 4:58 PM
> 
> Oh me, PCB's are *extremely* durable!  You can often bend one almost
> double without causing any damage.  Hair line cracks are usually
-----     Cut here - personal comment follows -----
Q: What's the difference between Jane Fonda and Bill Clinton?
A: She had the balls to go to Viet Nam
  
Robert Harris <bob at bobthecomputerguy.com>


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