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I have already finished my RNG project, for the time being at least, but I wanted to show some pictures of the finished white noise generator. It's quite neat and powerful. Connecting the orange output wire and the ground cable to a speaker with an amplifier produces a strong white noise source.
I am quite happy with the white noise generator, the issues I was having are to do with the sampling and possibly the software side of the project.
The integrated circuit is a UA741 opamp, and I am feeding it with a 12V split power supply (+12v t0 -12V). The noise is generated from a transistor operating in reverse breakdown mode. I found that this produces much more noise than Zener diodes, since zener diodes are designed with noise reduction in mind, while a transistor is not. Operating a transistor in this manner could reduce it's lifespan, however, that remains to be seen.
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