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Re: [Doepfer_a100] Re: Reducing the A-138a/b noise with OP470.

2012-07-03 by Jim Credland

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