|[AMRadio] Freezing electrolytics and other stuff|
w5jo at brightok.net
w5jo at brightok.net
Sun Jan 3 17:45:07 EST 2016
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.
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.
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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