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A Simple Unpredictable Random Number Generator (1986) [pdf] (semanticscholar.org)
11 points by brudgers 17 days ago | hide | past | web | favorite | 3 comments

I'm partial to the avalanche


There is a similar circuit utilizing a zener diode (https://www.edn.com/design/analog/4420926/White-noise-source...). This is very flat white noise and very wide band and works quite well (had it breadboarded a year ago).

The need for 18v seems like an annoyance.

In your link they supply it from a battery, but if you want this as a RNG for a computer you aren't going to want a battery...

You can use a regulator to supply it but the noise from the regulator will be a critical consideration since the noise from the regulator may be predictable to an outside observer. So that deserves a careful design.

This sort of design seems simpler to get right at least electronics wise, https://github.com/waywardgeek/infnoise but OTOH the underlying noise process is a lot less clear than a zener, and I would worry that it's picking up external RF.

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