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deadairspace | 12 years ago

A classic source of white noise is to reverse-bias a diode or the base-emitter junction of a transistor[1]. This produces shot noise[2] though, which is independent of temperature, so I guess it's not what they are using.

[1] http://darrenyates.com.au/electronics/archives/40 [2] http://en.wikipedia.org/wiki/Shot_noise

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