You could also simply use an FM tuner and tune it in between stations for atmospheric noise. Like random.org did for a long time. [0]
Cosmic quantum noise for all your random number needs (after some filtering). Disclaimer: if you are under NSA attack you might have issues with this $5 setup.
Cosmic quantum noise for all your random number needs (after some filtering). Disclaimer: if you are under NSA attack you might have issues with this $5 setup.
[0] https://www.hostingadvice.com/blog/random-dot-org-true-rando...