[sDIY] CV output buffer chip?

[Stewart Pye]

Hi Toby,

The CA3260 should do the trick, If you can get hold of it. There may be a
more modern op amp but this is the only one I could find in the "IC Op Amp
Cookbook" ( W.G. Jung.) It is a dual version of the 3160, which is an
internally compensated version of the 3130. The CMOS output stage allows
rail to rail output. It should fit all your requirements.

If you find this part is hard to come by or too expensive, you could
consider using a >5V supply and an LM324 quad op amp that will go close to
ground but not Vcc. You don't even really need a regulator for it if you
are penny pinching. They only cost $1 anyway. A similar dual unit is the LM
358 ( I think :)

Regards,
Stewart Pye

At 11:37 PM 22/06/99 -0700, Toby Paddock wrote:
>I'm (slowly) working on a CV controller and am looking for a 
>buffer op-amp for the output.  Can anyone recommend a chip?  
>Here is my shopping list...
>
>Need:
>Operate on single 5v supply.
>Enough current to drive several CV inputs on 
>things like minimoog, odyssey, sh-101, arp seq.
>
>Really hoping for:
>Output goes to within about 0.5v of the rails.
>
>Would like:
>Not surface mount.
>Easy to get and semi-cheap.
>Dual or quad.
>
>Not too concerned with:
>Offset.
>Frequency response.
>Input impedance.
>High gain.
>
>I'm finding that I have the op-amp skills of a breadstick.
>It seems that the combination of single 5v supply and 
>output going nearly to rails is the killer.
>
> - -- -  Toby Paddock
>http://www.seanet.com/~tpaddock
>