[AMRadio] Freezing electrolytics and other stuff


Mike Sawyer w3slk at verizon.net
Sun Jan 3 20:04:32 EST 2016


Good point Jim. Also Lithium Oxide batteries do not like the cold weather
either. We learned that at work when we had all of our cordless tools and
chargers in a building without heat. Cost us a good amount of money for new
batteries!

Mod-U-Lator,
Mike(y)/W3SLK



-----Original Message-----
From: AMRadio [mailto:amradio-bounces at mailman.qth.net] On Behalf Of Jim
Candela
Sent: Sunday, January 3, 2016 6:22 PM
To: <w5jo at brightok.net>
Cc: <amradio at mailman.qth.net>
Subject: Re: [AMRadio] Freezing electrolytics and other stuff

Might also consider the effect from extreme cold on LCD displays, and memory
hold up batteries. I have a HP 8591A spectrum analyzer with a 3 volt battery
which holds all the calibrations and config. I'd worry about that battery if
it stayed sub freezing for a long interval.

Jim
Wd5jko

Sent from my iPhone

On Jan 3, 2016, at 3:45 PM, <w5jo at brightok.net> wrote:

> Charlie,
> 
> Check the specifications for the caps you plan to use.  Looking at the
specifications for aluminum electrolytic caps I see the minimum operating
temperature range from -25 to -50 C.  I looked at the Mouser site to find
those numbers.  Give that information I don't think I would be concerned.
What is of concern is how old they are.  As they age the paste will dry so,
if you are using caps that are old I would do a leakage test.
> 
> A few years back I ordered some Sprague caps to have for stock.  They have
been stored in a climate controlled atmosphere (read indoors heated and
cooled) for about 6 years.  I installed some of them in a receiver and in
about a year they started leaking.  I replaced them with more from stock and
the same thing, so I ordered new ones and the problem went away.  I can only
guess they all came from a bad batch.  They were of different values and
voltages.  I have yet to understand why that happened.
> 
> Jim
> W5JO
> 
> -----Original Message-----
> Charlie,
> 
> Put a few Electrolytic caps in your freezer.  after a week or so, take 
> out and test.
> 
> I'm going to do that myself, and then test to see if issues arise.
> 
> Regards, Bob
> 
> 
> On 1/3/2016 3:39 PM, CL in NC via AMRadio wrote:
>> Do to circumstances beyond my control, I am having to relocate my shop to
another building.  Prior to this move, my shop was attached to the house and
had some residual heat getting in that kept it OK, nothing like the temp
swings now.  Right now I use a kerosene heater when I am out there working,
but have been leaving a special type of electric heater on when I am not
there when freezing temps are expected.  So far, the electric unit keeps the
temp around 40 if it's 20 out, but a 8 cents a KWH, it will get pricey fast.
The building is insulated, but ran out of money to put siding on it yet,
just insulation board and R13 fiberglass.  On the chance that power fails
and it is zero outside, and other than a long time for tube gear oscillators
to stabilize after turn on,  what are the effects of freezing temps on
things like electrolytics?  I've got a couple pieces of higher end test
equipment, a comm service monitor and a Tektronix 465M scope, any adverse
effects on those?
>> 
>> Charlie, W4MEC in NC
> 
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