Norm Rosenzweig wrote:
>
> Hi Tim
> you wrote.
> ----------
> > Hi people,
> >     Does anyone now how i can get a negative voltage to drive the
> > contrast of the 16x1 LCD display, FROM a single supply of +13.5
> >
> > Thanx
> >   Tim
> >
>
> Have you tried the Si7660 or Si7661.
> These chips are 8 pin devices, the 7660 will give you a up to a -10
> from a +10 supply while the 7661 will give you up to -20 from a +20
> volt rail.

Of course, if you have RS-232 support on board, you will have that
negative source. It can be tapped off the appropriate pin of a Max-232
or similar.

Don McKenzie  mailto:don@dontronics.com   http://www.dontronics.com

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