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Old 1st Dec 2017, 5:11 pm   #7
David G4EBT
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Join Date: Feb 2003
Location: Cottingham, East Yorkshire, UK.
Posts: 5,737
Default Re: Electrolytic capacitor fails after 1 hour in service!

I think that rippe current is rarely considered and rarely given by makers, which is why I tend to stick to Rubycon electrolytics from Farnel, because they're 105C and have high ripple ratings despite their compact physical size. Furthermore, comprehensive data is available so you aren't buying a 'pig in a poke' where he only factors you know about are the capacitance and working voyage. You can check whether they meet the desired ripple rating spec. EG:

http://www.farnell.com/datasheets/23...377.1373580746

I use the compact high voltage ones for stuffing smoothing/reservoir caps, as I can check that despite their diminutive size, the ripple rating is well up to the task with a good margin of safety.

Hope that's of interest.
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