Noisy noise generator

[Scott Gravenhorst]

I'm curious about why zeners were chosen here.  Are they 
notably the most noisy silicon device?  

My personal experience with this was after trying several
reverse biased BE junctions of small signal bipolar 
transistors, I (on a whim) tried a germanium diode and 
found it to have a sufficiently high noise level that I 
could use a fairly low gain amplifier and no shielding 
was required.

YMMV.

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