[sci.electronics] Audio white noise source

n1mjr@IASTATE.EDU (Reilly Michael Joseph) (04/09/91)

Help!

I need a reasonably flat white noise source with a bandwidth
from 0 kHz to about 40 kHz.  (I'm building a system to emulate the
mating calls of katydids.)

I'm looking for some sort of single-chip solution.  The output level
isn't critical, since it will have to be buffered and switched anyway.

I've fooled around a little with amplifying the noise across a reverse
biased zener diode, but the level of amplification needed makes the
circuit design and layout a little too critical for my taste.

Any help at all will be greatly appreciated.


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     Mike Reilly                    Stop the madness, Don't do EE

     n1.mjr@isumvs
     n1mjr@isuvms
     n1mjr@iastate.edu

burris@highspl (David Burris) (04/10/91)

From article <1991Apr9.035435@IASTATE.EDU>, by n1mjr@IASTATE.EDU (Reilly Michael Joseph):
> I need a reasonably flat white noise source with a bandwidth
> from 0 kHz to about 40 kHz.
> 
> I'm looking for some sort of single-chip solution.

You can get a noise generator chip at Radio Shack. It's SUPPOSED to
be white noise. I don't know statistically how close it actually is.

-- 
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David Burris					Aurora,Il.
burris@highspl		           ..!linac!highspl!burris
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