[sdiy] Truly white noise

[TIm Daugard]

> >*Truly white noise would have to be scalable - containing all frequencies in
> >the same amplitude, such that if you pitchshifted it up some it would still
be
> >white, because all frequencies a human can hear are still present (those that
> >were subaudible or above audible before are now shifted into audible range as
> >others are shifted out).
>
> Interesting, I think this is true.

I agree. To be useful the white noise and other sources should be DC coupled.
Unfortunately this makes stability difficult to design in. My final noise source
was designed and built with the noise coupled through AC circuits with a 3 db
point of 1/100th of 1 Hertz.

I have been using 6.3 V zeners as my noise source. They are inexpensive and
every one has put out a good level of noise.

Tim Daugard
Going on vacation so I won't have time for this ;>