[sdiy] Opamp question, I like to hit the rails

[harrybissell]

Most rail to rail opamps have really low current drive at the rails... why not
make
a charge pump negative supply with some chips like the ICL7660 (iirc) or some
Maxim power supply chips. You'd only need a milliamp or two to make it work...

H^) harry

Theo wrote:

> I don't have a negative supply available and need a CV from a LFO between 0V
> to 5V.
> The supply is 12V so there is enough headroom at the top.
> But to get (close to) 0V going to the rails is the option with least
> additional components.
>
> Therefore I repeat the question: what would be a good (dual) opamp for the
> job?
>
> Thanks,
> Theo
>
> From: John Blacet <blacet at blacet.com>
>
> > The real question is *why* do you need rail to rail?
> >
> > --
> > Regards,
> > --/////--
> > John Blacet
> > Blacet Research
> > http://www.blacet.com
> >
> >