On Fri, Apr 17, 2009 at 7:56 AM, Bob Blick wrote: > > I'm going with Vitaliy here. The 1uF requirement is for bulk > capacitance, not low ESR. Any cap will work perfectly fine. > The resistance in the switching elements is higher than the > ESR of the worst electrolytic. Sorry I do not quite understand you. What do you refer by "switching elements" here? The discussion topic here is the power supply "bypass" or "decoupling" caps and I agree with Olin that in general electrolytic is not recommended in this application. It might work in some cases. The Maxim datasheet shows a polarized capacitor. I would assume that they mean tantalum capacitor or similar. Actually I would think a ceramic capacitor is more suitable nowadays. -- Xiaofan http://mcuee.blogspot.com -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist