Luis Gonzalez wrote:

> Leo van Loon wrote:
> >
> > Dear friends,
> >
> > I am producing an electronic dice with a PIC12C508 as a kit for
> children.
> > For simplicity I must use a 9V block battery, but the PIC does not
> like 9V.
> > How can I reduce 9V to 5V with a minimum of components?
> > Does only a serial 4,7 V zener work?
> > I feed the seven LED's of the display directly from the battery, that
> can be
> > no problem.
> >
> > Leo

Your enemies are drop-out and quiescent current.

Use a low-drop regulator for starters. JRC makes a cheap range.

To solve the second problem, use some mechanical contact that
will give some sort of a pulse when the die is activated (I suppose
 it could be a pushbutton), and a 4011 flip-flip to switch the
regulator on. The PIC can switch the regulator off again.

--
Friendly Regards

Tjaart van der Walt
mailto:tjaart@wasp.co.za

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