Re: [CGUYS] electronics failures

2007-04-09 Thread Eric S. Sande

But modern electronics don't experience that.


You have a chip that runs at 35C (idle) ramping from room
temperature to operating spec.  That is stress, no?



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Re: [CGUYS] electronics failures

2007-04-09 Thread Tony B

It is stress, yes. But so is *operating* at 35C. And the latter occurs
far more than the former.

On 4/9/07, Eric S. Sande [EMAIL PROTECTED] wrote:

But modern electronics don't experience that.

You have a chip that runs at 35C (idle) ramping from room
temperature to operating spec.  That is stress, no?




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Re: [CGUYS] electronics failures

2007-04-09 Thread Eric S. Sande

You don't leave your car on all night do you?


Actually I don't have a car, I ride a bicycle :-).


Yes, the device is designed to operate at certain temperatures; it's
also designed to be *turned on and off* without failing.


Of course.  I don't dispute that.  But the question related
to is it better to leave it turned on.

I say yes, it is better for the devices and if you are running [EMAIL PROTECTED]
you will get more credit.

Moving parts, OTOH, such as fans and disk drives, can be said to have x 
hours of life to them, and they will fail when they reach that point. 
Leaving a machine off overnight _will_ extend their lives.


Well, on that point you are theoretically right.  But in actual fact
the mechanical parts are so reliable that you can expect many
years of reliable use out of them.  So it makes no sense to switch
off to extend their life.




- Original Message - 
From: Tony B [EMAIL PROTECTED]

To: COMPUTERGUYS-L@LISTSERV.AOL.COM
Sent: Monday, April 09, 2007 7:43 PM
Subject: Re: [CGUYS] electronics failures



I understand your point. I'm just saying there's no hard evidence to
back up the assertion equating this to an increased failure rate in
non-filament items. And all kinds of evidence that failures occur
*during use* all the time.

Yes, the device is designed to operate at certain temperatures; it's
also designed to be *turned on and off* without failing. Moving parts,
OTOH, such as fans and disk drives, can be said to have x hours of
life to them, and they will fail when they reach that point. Leaving a
machine off overnight _will_ extend their lives.

You don't leave your car on all night do you?

On 4/9/07, Eric S. Sande [EMAIL PROTECTED] wrote:

It is stress, yes. But so is *operating* at 35C. And the latter occurs
far more than the former.

No, the device is designed to operate at 35C.  It is also designed
to operate at higher temperatures, but not beyond a maximum at
load depending on the chip.

My point is that the initial switch on is the hardest thing that the chip
and the system has to deal with in terms of operational stress.




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Re: [CGUYS] electronics failures

2007-04-09 Thread Tom Piwowar
Moving parts, OTOH, such as fans and disk drives, can be said to have x 
hours of life to them, and they will fail when they reach that point. 
Leaving a machine off overnight _will_ extend their lives.

This is always an interesting question because both answers are correct. 
Turn-on causes failures and wear causes failures. Hence the best answer 
is in the middle. If you are not going to use a device for 8 to 10 hours, 
turn it off.



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[CGUYS] Lightning [Was: Speeding Up XP]

2007-04-09 Thread Tom Piwowar
First of all, telephone loops aren't grounded.  We were hit by lightning
in 1998 and it fried all of the phones.  There were burn marks coming
out of the jacks, no kidding.

When we recently remodeled I found a carbon block arrestor on my phone 
line. I replaced it with a solid state model for about $35. Somewhere I 
read about how far into the house the voltage spike will travel based on 
the clamping time of the arrestor. The electronic model limited it to 
just a few feet. The old arrestor let the surge travel over 100 feet -- 
not too useful.



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Re: [CGUYS] Speeding Up XP [Was: Vista Memory Needs

2007-04-09 Thread Alvin Auerbach

Analogy:

A surge protector is like a bucket that the surge energy is dumped 
into. [The excess electrical energy is turned into heat by the surge 
protector.] After the surge is over, the bucket is emptied, [the 
surge protector cools down] but if you look closely, a small amount 
of the rim of the bucket has been burned away [the surge protector is 
slightly damaged with each surge], and it doesn't hold quite as much. 
Not all surge protectors have the same size bucket. Some are too 
small. Normal surges are like a cup of energy; bigger surges are like 
a quart or even a gallon of energy. A lightening strike is like a 
tanker truck of energy dumped into the bucket. The bucket is so small 
in comparison, that it's swamped; [the heat energy raises the 
temperature of the surge protector way beyond what it can cope with] 
it doesn't matter if it's there or not.


Many years ago I witnessed a laboratory demonstration of the power of 
lightning. They rigged up a very high voltage spark (a shadow of a 
real lightning bolt) and had it jump to a block of wood. In an 
instant, the spark jumped and the block of wood was just gone. In 
that instant, all of the moisture in the wood was turned into steam, 
and the steam just shattered the wood into dust.





Not to burst your bubble, but in my personal experience surge protectors
are worthless for lightning strikes.  Our home was hit by lightning in
2003 and at least one piece of equipment was fried on (a) the AC line,
(b) the phone line, and (c) the cable TV.  Not sure where the jolt
actually came into the house but it fused a phone line (physically
welded the conductors)knocking out a couple of telephones and a fax
machine, wiped out the cable box (no connection to the phone system) in
the family room, and fried my WiFi access point (connected to a cable
modem that suffered no damage -- go figure).

And all the affected gear except the telephone handset was on a surge
protector.

-Mike


-Original Message-
From: Computer Guys Announcements and Discussion List
[mailto:[EMAIL PROTECTED] On Behalf Of Eric S. Sande
Sent: Monday, April 09, 2007 6:26 PM
To: COMPUTERGUYS-L@LISTSERV.AOL.COM
Subject: Re: [CGUYS] Speeding Up XP [Was: Vista Memory Needs


Not so sure about it being a good idea that personal machines run

around

the clock.  Besides the --- waste of electricity


My brother and I have different takes on this.  He is a power off
guy, I'm a power on guy.  Since day one I've always run 24/7 with
all my electronics.  In the tube days it made sense to switch off, but
then you had to wait for the set to warm up.


--- greatly increased exposure to corruption from power fluctuations

and

network baddies


Not with a hardware firewall and a good UPS.


--- 24/7 operation brings on the inevitable failure of $10 cooling fans



which then can cook your chip


Possibly a valid point.

However, the most stressful moment for electronics is the initial
power cycle (i. e., turning it on).  The only real danger that I can
see with an always on condition is lightning strikes.  Overvoltage
conditions, in other words.  But we have surge protectors for that.




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Re: [CGUYS] changing the subject line

2007-04-09 Thread mike

Well we'll get the windows users to change he subject to make it easier for
the mac users to keep up.  NP there.

Mike

On 4/9/07, Tom Piwowar [EMAIL PROTECTED] wrote:


How much does it cost to change a subject line? I ask because some
members seem to be getting awfully lazy lately.

Easy to do for Macs. I think this is primairly a Windows problem.



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Re: [CGUYS] Speeding Up XP [Was: Vista Memory Needs

2007-04-09 Thread John DeCarlo

On 4/9/07, Lowe, Michel D [EMAIL PROTECTED] wrote:


Not to burst your bubble, but in my personal experience surge protectors
are worthless for lightning strikes.



Lightning is pretty darn powerful, that's for sure.

The other problem with home surge protectors is that you can't tell if they
are good any more.

My understanding is that if it protected you from some regular surges
already, it may not be doing anything any more.

I'm sure someone on this list can elaborate.

--
John DeCarlo, My Views Are My Own



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Re: [CGUYS] electronics failures

2007-04-09 Thread Brian Jones
Lightbulbs and vacuum tubes give off electrons as they operate, and the
filiment becomes thinner and more brittle.  The construction of the filiment
will determine the expected life of the bulb.

Electronics are quite reliable once they have passed their 30 days 'burn-in'
period.  If they make it this far, they will lilkely give you years of
trouble free operation.  But the power supply is often the killer of the
electronics.  They can absorb some voltage spikes early in life.   Several
years later, due to weakened components from repeated voltage spikes, they
will begin to allow some of the spike to pass through to the electronics,
damaging the electronics.  This is why I use a surge protector with all my
delecate electronics... to extend the life of the power supply as well as
the electronics.

Heat (and extream cold) is another enemy of electronics.. weakens the solder
joints...  that has already been discussed.



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Re: [CGUYS] Lightning [Was: Speeding Up XP]

2007-04-09 Thread Brian Jones
- Original Message - 
From: Tom Piwowar [EMAIL PROTECTED]
 When we recently remodeled I found a carbon block arrestor on my phone
 line. I replaced it with a solid state model for about $35.


I supplemented mine with a 3 stage ($69) surge protector at the entry point
to my house 15 years ago after an incident that literally smoked my modem
and several phones.  I heard the thunder about 4 seconds later, indicating
that the lightning strike was quite far away.  Since the upgrade, I have not
lost any phones or modems to phone line surges.  (I realize that this would
be useless in a direct hit.)



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