alan smith wrote:
> I'm thinking that using the LM324 will solve the gain problem, and using
> some sort of current boost on the output..any suggestions on a simple
> transistor circuit? The LM324 can source up to 40mA but they want to do at
> least 100mA. Thinking a NPN/PNP pair (2N3904/2n3906) inside the feedback
> loop might be the easiest way? They are rated for 200mA continuous, so that
> would provide the necessary drive.
> 
> Thoughts?

I think you'll lose your rail-to-rail output capability with any sort of
simple transistor circuit (e.g., emitter-follower). You won't be able to
drive the output any closer than one B-E drop above ground.

If you really need to output 0.0 to +10V with low source impedance over
the whole range, I really think you're going to have to bite the bullet
and provide a negative supply, in which case, you can just use the original
opamp.

It was simply a Bad Idea(TM) to try to do this with a single supply.

-- Dave Tweed
-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist