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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