I read about electrolytics being used for 'bigger' (whatever that may mean >1
uF?) capacitors, but not the series resistance stuff.

Thanks
Mark
> -----Original Message-----
> From: piclist-bounces@mit.edu 
> [mailto:piclist-bounces@mit.edu]On Behalf
> Of Francisco J. A. Ares
> Sent: 24 November 2004 11:49
> To: Microcontroller discussion list - Public.
> Subject: Re: [EE] Why specify one kind of capacitor over another?
> 
> 
> Electrolytic caps are normally for high capacitance values as 
> there are 
> no other way of achieving so high values with any other type of 
> capacitor (AFAIK)
> 
> But they have relativelly large series resistance and also, at higher 
> frequencies, a high inductive load (due to its own 
> construction form), 
> so other types of capacitors are used for lower capacitance levels
> 
> AFAIK, ceramic capacitors (as they're really flat) are the 
> best in terms 
> of series resistance and inductive component of the total impedance.
> 
> Insulation voltages are also an issue. Best ones here are 
> polyester or 
> polypropilene.
> 
> Hope this helps to get you started
> Francisco
> 
> 
> Mcgee, Mark wrote:
> 
> >I'm a relative electronics newbie (A-Level, 15 years ago, 
> not much since)..
> >
> >..I was wondering why you would choose one type of capacitor 
> over another in
> >given applications.
> >
> >I notice that the example cct on a datasheet for the LM317LZ 
> vreg specifies
> >0.1uF electrolytic, but has onother in a different part of 
> the circuit that
> >isn't electrolytic.  Why might that be?
> >
> >Regards,
> >Mark
> >
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