[sdiy] General White Noise Question

[Grant Richter]

The White Noise Source looks similar to the Electronotes designs.
The Noise Ring noise source is also based on that, BUT
I have had real problems using a 1 megohm in the R2 position for  
production (as in some original Electronotes designs).
I used a 1 megohm in the R4 position with the same C1 value and non- 
inverting JFET amp.
I had to switch to 100K in the R2 position to get all units to pass  
test.
Also do not use a SMT ceramic part for C1 or it will be microphonic.

It seems (from experience of building the 100 modules) that somewhat  
more current into the zener biased transistor produces a more uniform  
frequency distribution and output level.

Any quantum scientists have a theory why that should be?

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>>>
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>>>
>>>