In message  <EC6B3C2FBB@fs7.plessey.co.za> wterreb@plessey.co.za writes:
> I'm currently designing a product that will have a PIC running of
> four 1.5V penlight cells.   There is also a 12bit A/D and pressure sensor
> on the circuit which both demands very accurate 5V supply.
>
> This sounds like a fairly simple problem to solve, but I would still
> be interested to hear how other people would tackle the same problem.
> The full  requirements to be met are:
>
> 1. Stable 5V supply over the entire battery life
[snips]

Werner,

Is it necessary to have a stable 5V supply? The PIC will run over
the whole useable battery life (6V -> 3.2V).

Just a thought.

Regards,

Mike Watson