> OK, I will buy that.  But how are most consumer electronics designed?  I
> was planning on making something pretty small, using coin batteries.
> However, I just read that they are designed to run at tenths of
> milliamps, with short peaks to tens of milliamps.  Not too good for a
> PIC circuit.  So I could use AAA's, but I would need 4 to get 6V.  Or I
> could use a 9V, but they are pretty big.
>
> My PDA uses 2 AA's.  I don't think it is all 3V logic, so I am guessing
> it uses some kind of step-up regulator?

        Yup. Almost all consumer devices these days have step-up regulators as the
first stage. Maxim has a great variety of converters that are quite easy to
work with. http://www.maxim-ic.com. TTYL

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