Quote:
Originally Posted by MrBungle
Out of interest see there any negative transients or positive spikes? Each of those can knacker even the best of electrolytic capacitors in no time at all. Sticking an X2 rated cap across it as well might help.
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An X2 capacitor may be severly underrated or otherwise unsuitable for decoupling noisy DC power supply lines. It was designed to satisfy a very specific set of conflicting requirements found in mains filters and the like.