=20
>=20
> Don't you think that more of the reason has to do with the=20
> fact that many circuits require that the voltage not go much=20
> below 5V, so that you would really need at least 6 V to start=20
> with to ensure that it stays above 5 for the life of the battery?
>=20

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?

Alex

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