piclist 2000\06\06\095322a >
Thread: Filter Capacitors
www.piclist.com/techref/logic/dsps.htm?key=filter
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face BY : M. Adam Davis email (remove spam text)



The smaller cap generally has different characteristics than the large.  For
instance, you will rarely (if ever) see two ceramic caps in parallel, or two
electrolytics in parallel (unless the designer wanted a weird value, or space
considerations dictated such a design) for electrical reasons.  What you may see
is an electrolytic (higher internal resistance, can't react very fast to
small/short transients) in parallel with a ceramic (low capacitance, low
resistance, can't handle large/long transients).

-Adam

Mark Peterson wrote:
>
> In many products, I see a large electrolytic capacitor in parallel with a
> small disc or dipped capacitor.  Why is that done?  Obviously, the pair
> does not act as a single large capacitor, or aonly a single one would be
> used.  Just how does that arrangement work?
>
> Mark P

<393D062E.86C1694B@ubasics.com> 7bit

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