[sdiy] Opamp that gets close to the rails?

[harrybissell]

I'd try using an IC voltage doubler chip. Forget the number Intersil
7667 maybe
or similar chip from Maxim.  They 'do' make rail to rail chips but they
do not
drive a low impedance close to the rails...

H^) harry

David Cornutt wrote:

> I'm trying to build a simple voltage summing circuit, so I can
> jack up the output of my MIDI/CV converter to feed to my EML 101.
> Among the 101's perversities is the fact that the keyboard uses
> an offset control voltage; the left edge of the keyboard is not
> 0V but 5V.  The right edge is about 9.8V.
>
> I would like to power this circuit off of the 101's +-10V output
> which is available on the panel, because it's convenient to
> do it that way.  Is there an opamp that can get its outputs
> to within 0.2V of the supply rails?  I vaguely recall seeing a
> thread on this recently, but it doesn't seem to have made it
> to the archive yet.  I'm currently trying to use a TL082 and
> it goes non-linear at 7.1V with +-9V supply in a unity-gain
> circuit with reasonable resistor values.
>
> If there isn't, I can power it using a +-15V supply, but that
> means the box won't fit where I want to put it, so it would be
> nice if I could use the EML's 10V outputs.