[sdiy] OP291 op-amp

[Tony Clark]

> Any opinions on Analog Devices OP291 (OP191, OP491) op-amp?
> I'm looking for a rail-rail single 5V supply op-amp that 
> will do a few milliamps and get fairy close to the rails.
> Mostly for CV and maybe some audio frequencies, 
> but I don't need ultra hi-fi.
> They would be for kind of a 'miscellaneous sensor thing' 
> to 'music thing' interface.
> We use them here at work, so somebody must like them. 
> I know that's pretty vague, but that's where I'm at.

   We use OP496's (quads) here at work for ultra-high gain transducer 
amplifiers.  The only bad thing about these (and other rail-to-rail 
amplifiers) is that they don't like to deliver large amounts of current, 
and many don't have very good frequency responce.  Now if you're only 
talking about low-frequency and CV stuff, you might do okay, but don't 
expect great heaps out of them.
   As for current delivery, most will do a few milli-amps, but typically not 
near the rails.

   Hope that helps,

   Tony

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