Noise

Ed Nisley's blog [1] inspired me to think about generating noise using electronics. It seems transistor avalanche noise is a lot greater than zener noise. [4] seems like a good enough solution.

References

1. Avalanche Noise Amp
2. Some noise measurements for LEDs and zener diodes
3. Junction Noise Measurements I
4. Random Sequence Generator based on Avalanche Noise
5. Really, Really Random Number Generator
6. True Random Number Generators
7. http://www.jtxp.org/tech/xr232usb_en.htm