piclist 2000\06\06\121729a >
Thread: Filter Capacitors
www.piclist.com/techref/logic/dsps.htm?key=filter
picon face BY : Harold M Hallikainen email (remove spam text)



       The equivalent series resistance and inductance on the electrolytics are
fairly high, making them not do much for high frequencies. The ceramic
capacitor presents a low impedance for high frequencies while the
electrolytic presents a low impedance for low frequencies.

Harold

On Tue, 6 Jun 2000 07:58:32 -0500 Mark Peterson <.....markp@spam@spam@spam@CANNONTECH.COM>
writes:
> 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

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