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Old 05-16-2005, 07:53 PM
Ken Finney
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Default Re: Carbon Comp: Aging Causes Out Of Tol?

"Watson A.Name - "Watt Sun, the Dark Remover"" <NOSPAM@dslextreme.com> wrote
in message news:118f8qbc5pepsc4@corp.supernews.com...
Quote:
"mike" <spamme0@netscape.net> wrote in message
news:428785D4.8000206@netscape.net...
Watson A.Name - \"Watt Sun, the Dark Remover\" wrote:
I have fifty 910 ohm 1/4W carbon composition resistors, still in the
paper tape, which is labeled:

OHMITE
910 OHM
1/4 W 5%
RC07GF911J
OC9115

Judging from the last line, they're 14 years old. They've never
been
used, AKA New Old Stock. Every resistor measures greater than 5%,
some
are over 1k. Over 14 years, would drift from aging cause them to go
that far out of tolerance? I have carbon film resistore much older
than
these and they still measure within 5% tolerance, usually within 2%.

I think this is common.
I bought a box of 1000 114 ohm resistors. Stackpole Mfg Date 1980.
Unfortunately, they're marked 100 Ohm 5%. Was gonna use 'em
in pairs to terminate 50 Ohm transmission lines...oh well...
I should try cooking them to see if they change back.
mike

Hey, YEAH! Great idea! I'll hold a couple over the soldering iron and
see if they stay changed when they cool off. It won't hurt to mess up a
few, since they're already messed up to begin with. ;-)

BRB...

Well, that didn't help. I took four of them and layed each on the
soldering iron. Each went up several dozen ohme, some between 1050 and
1100. And they stayed at that value when cool. :-(
< snip >

It's been a long time since I did the math, but IIRC, when you added up all
the tolerances, milspec carbon comps could vary in-circuit by 41.4% of their
stated value and still be within spec.



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Date: Mon, 16 May 2005 17:55:33 GMT

On 13 May 2005 15:51:49 -0700, "stevem@citlink.net"
<stevenm@uneedspeed.net> wrote:

Quote:
None of the South's better generals, however, fought to preserve
slavery. Niether Robert E. Lee nor Stonewall Jackson, nor Jeb Stuart,
nor George Johnston were slave owners.
Is that right? How do you account for this:
http://www.sonofthesouth.net/leefoun...es%20slave.htm

I can't find anything in a cursory online search about Jackson owning
slaves, but his family certainly did:
http://en.wikipedia.org/wiki/Stonewall_Jackson

....as was JEB Stuart: http://www.jebstuart.org/history.cfm

Don't know George Johnston. If you mean Joe Johnston, I can't find
anything online with another cursory search. Not going to try very
hard; the side he picked speaks for itself.

Quote:
They thought the institution abhorent.
Obviously not.
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