[sdiy] Uniformly distributed noise generator?
ijfritz at comcast.net
Mon Jun 10 22:48:26 CEST 2013
At 01:35 PM 6/10/2013, David G Dixon wrote:
> > indeed, I thought of using a digital source myself, but was
> > hoping the analogue gods here could come up with something
> > fully analogue. I'm certain there's something out there..
>I've given up on analog noise sources, personally. It is so much easier to
>get nice noise with a digital source. The biggest problem with analog noise
>is the extreme amplification required, which picks up every tiny little
>problem in your circuit/system. Plus, it just doesn't sound that good to
The problem with digital sources, it seems to me, is that you can't feed
them into a S/H to get random voltages. Careful board layout and
decoupling are easily applied to make nice clean analog noise
sources. Mine sounds pretty good to me, but I did have to sort through a
few dozen devices to get one with acceptably low 1/f noise. The biggest
mistake people make is to assume that the noisiest devices (greatest
voltage output) make the best noise sources. This is abolutely untrue;
those always have a large 1/f component. My best device actually had about
the lowest output of the batch I tested.
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