Don Pearce wrote in message news:496c541a.346449453@localhost...
On Tue, 13 Jan 2009 08:22:26 +0000, Eeyore
wrote:


TonyL wrote:


The *only* problem with the LM324 in this application is the crossover
distortion.

A consequence of its internal design.

Graham

It has a poorly biassed output stage - virtually pure class B.


Whether the design is "poor" or not depends on what application you have in
mind. THe LM324 was one of the first op-amp designs to work from a single 5V
rail, making it a convenient way of adding analogue functions to a logic
board. The input common-mode range includes the -ve supply rail making it a
good choice for comparators etc., and the output can drive TTL directly.

And the LM324 *can* work quite well as an audio amp (though possibly not a
headphone driver) as long as a suitable resistor is connected between the
output pin and the -ve supply rail.

I entirely agree that there are far better audio op-amps around these days,
but the LM324 still has it's uses, and it's dirt cheap!

David.