Quote:
Originally Posted by Maarten
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.
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Absolutely right. I think it would be closed down pretty quickly in a pulse application (not that this is actually being used as a pulse capacitor, but it is repetitively running big currents up a DC bus and X2's aren't designed for that at all).