Wouldn't a zener make a better noise source. You can also breakdown the 
emitter-base diode, but watch the current. It can't take more than say 100uA. 

-----Original Message-----
From: Magnus Danielson <[email protected]>
Sender: [email protected]
Date: Sat, 12 Feb 2011 14:27:50 
To: <[email protected]>
Reply-To: Discussion of precise time and frequency measurement
        <[email protected]>
Subject: Re: [time-nuts] Random Walk Noise experiment

On 12/02/11 14:16, ehydra wrote:
> Hi all!
>
> I friend of mine wants to construct an experiment for students for
> studying random walk noise.
>
> What is the best good available transistor or other parts? All parts he
> tested where just to good.
>
> Thank you!

Use a standard transistor or diode. Run a largish DC current through it. 
Use an op-amp to amplify the noise.

Ćheers,
Magnus

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