At 08:35 11/06/99 -0700, you wrote:
>The LM324 has a class B output stage plus a small current sink to
>negative. They did this so the output could go all the way to the negative
>supply rail, back in the stoneage days.
>
>What you're hearing is called crossover distortion. The LM324 will do that
>whenever the output switches from the positive transistor to negative
>transistor or vice-versa.
>
>Using a different opamp is the obvious solution. You can also make sure
>the opamp never switches by putting a resistor from output to negative
>supply. That means you'll be running class A. It'll use more current of
>course.
>
>Cheers,
>Bob
>
>


HUMM,
Are you sure about this? Don't forget that most distortion in this type of
circuit is due to the LARGE offset votage that the LM324 had 2mV I think.
As for a relpacement, an LMC660 is the way to go.

Dennis