At 01:06 PM 14/07/2010, you wrote:
>What they all said ..
>
>and
>
>even ecaps involve a degree of dark magic!
>
>1. Too LOW a voltage also kills caps quicker.
>For wet aluminum caps, 15V on a 35V cap is too low!
>
>2. Putting another comment into a formula
>Rule of thumb to be used with care but useful.
>
>                      Lifetime ~~~= Hours_rated x 2^(Trated-Toperating)/10
>
>so REAL 105C caps are well worthwhile.
>
>(2^(105-85)/10 ~~= 4 times longer lifetime.
>
>3000 hour versus 2000 hr caps = +50% longer lifetime.
>
>All very approximate.
>
>
>3. If it doesn't say Panasonic on it then there's a reasonable chance
>that it hasn't got Panasonic in it. Farnell are reputable but bad
>things happen. I'd check that. Really.

These are also Panasonic:

http://www.happytrees.org/main-images/ic-manuf-logos/ic_manuf_logo--Matsushita_Electronics_Corp.jpg
http://www.happytrees.org/main-images/ic-manuf-logos/ic_manuf_logo--Matsushita_Electronics_Corp-3.gif
.. latter is a bit distorted, usually it looks like this:

http://media.digikey.com/photos/Panasonic%20Photos/TSUP%20SERIES%2025,35.jpg

The stylized 'M' is for Matsushita, of course.

>Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
speff@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com



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