If you&#x27;re going to have a blackbox (the SOC), you might as well get a BitBabbler as they have better design for noise and the black box is dumbest USB chip they could find.<p><a href="http:&#x2F;&#x2F;www.bitbabbler.org&#x2F;index.html" rel="nofollow">http:&#x2F;&#x2F;www.bitbabbler.org&#x2F;index.html</a><p>Needs more peer review and independent testing anyway. It&#x27;s designed so you can do it yourself with a logic analyzer or whatever.<p>EDIT: I should add that, quite interesting to me, BitBabbler folks are building this for people who already know why a TRNG or analog source is important. They&#x27;re not interested in evangelizing or winning anyone over: just people already wanting one buying it and preferably analyzing it to give them feedback on esoteric failure modes they haven&#x27;t thought of. Only contact them if you&#x27;re serious.