Speaking of the trusty 7805, I'm wondering how you decide how much filtering
is required on the input.  I've always put a couple of 2200 uFs in for my
own use, but these are the most expensive part of the board, so if I could
get away with one, I'd do it.

I realize that the needed capacitance goes up with less headroom, and with
increased current draw.  I'm thinking 9V DC in, up to 1A out.

You might want to ask how much ripple is acceptable, and that's another
thing I don't know, but there must be a standard number for this, for PICs
as well as HCT/HC logic?

Thanks for any insight,
Colin

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