here is a link you might find helpful:

http://www.radio-electronics.com/info/data/capacitor/capacitor_types.php

Bob J wrote:

>Up until now all of my projects have used electrolytic capacitors in
>the power supply section.  After learning a few things along the way
>(like putting a filter cap next to the pic from Vdd to gnd, which are
>tantalum that I had in the junk box)  I assume that even with surface
>mount stuff that electrolytics are still ok to use in dc power
>applications.  What I'm wondering is should I be thinking of switching
>to polypropylene for better temperature stability, working life, etc.,
>in non-power circuits especially when there are size constraints?  I
>guess my real question is, where and under what circumstances should
>one use electrolytic caps, where should one use polypropylene caps,
>tantalum, etc.?
>
>Regards,
>Bob
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>  
>

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