[time-nuts] Random Walk Noise experiment

Bruce Griffiths bruce.griffiths at xtra.co.nz
Sat Feb 12 20:02:23 UTC 2011


Flicker noise is not the same as random walk noise, the spectra differ.
Using an AC coupled generator (eg a sound card) filters out the low 
frequency content.

Zeners and transistors (biased at low current) can be used to generate 
flicker noise directly at least for low frequencies where it dominates.
Generating random walk noise is more difficult, integrating white noise 
is one technique that can be used  (at least in principle).

Bruce

Don Latham wrote:
> in software:
> http://socrates.berkeley.edu/~phylabs/bsc/Supplementary/NoiseGenerator.html
> Chris Albertson
>    
>>> What is the best good available transistor or other parts? All parts he
>>> tested where just to good.
>>>        
>> A conducting zenier diode across the input of an amplifier.
>>
>> --
>> =====
>> Chris Albertson
>> Redondo Beach, California
>>
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