On 3 Jul 2012, at 21:11, Jim Credland < jim@... > wrote:

> I chucked the lm324s out of a previous design here, the dirty cheap and pin compatible tl084 sounds lots better. I think the slew rate was killing me. Alright for fast signals as long as the voltages were low, but with a 7v peak to peak signal it's gotta be rolling off at the top
>

Just to finish my own email. I think the 324 is about 0.5v/us, which if my mental math is right must mean it starts to do bad things at about 5khz. I didn't measure the noise - i imagine there are better chips than the 84 for that.
J


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