From: Ralph Mowery 
Reply-To: rmowery@ibm.net
>    The schematic calls for a multi-section 100uf 200v can,
> and I've found a single radial unit (three would be used)
> that have ratings other than what the schem' calls for,
> 250 (300v surge), 350 vdc (400 surge), and 450v (500 surge),
> that are available in several capacities in addition to
The capacitors used as filters are not usually that critical.  You want
to make sure the voltage rating is equal or greater than the origional
voltage.  I don't like to go over twice the voltage value as sometimes
the capacitors will not form correctly.  The plates of an electrolitic
will actually 'form' or take on differant properties as voltage is
applied to them.  As to the value, in a pinch, you can go somewhat lower
in value, but it is best to go up. Again, I don't like to go over two
times the value, but it probably would not hure.  You will get beter
filtering, but it also puts more of a strain on the other power supply
components as the capacitor charges.  Usually not a problem, but if you
go way over, say 10 times the capacity, then you could stress the
diodes  and resistors in the supply and you might also have to go to a
slow blow fuse in the supply as the flter acts as a short circuit tuil
it is charged.
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