Quote from: larry_vw_1955 on November 11, 2022, 01:57:48 AM

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That just confirms that this is a good circuit. Tongue

I would imagine all such usb devices use that technology in some way. They're definitely not sampling radioactive decay or something right?

When ordering from Amazon, there is a lot of trash to be honest. It's possible that you get a device that just uses a rand() C function on a microcontroller or something.
Worst-case even just spitting out numbers deterministically and not uniformly random.

That's why I'd prefer to buy a device with open-source hardware.

Quote from: larry_vw_1955 on November 11, 2022, 01:57:48 AM

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I just wasn't aware that they're sold under the simple term 'TRNG', as I couldn't find anything when looking for 'avalanche noise circuit PCB'.

Because they want to be a bit cryptic about how exactly their device works. They don't want people to build one themself necessarily.

You'd pay for the convenience of not spending hours on a new project and probably having to debug it as well.
Trezor and Foundation Devices have shown that open-source hardware is possible without your business going down due to the bad bad DIY scene.

Quote from: larry_vw_1955 on November 11, 2022, 01:57:48 AM

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It would be good if these devices came with schematics and board files to verify the circuit more easily.

yeah there's no way that's happening with something like TrueRNG.

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(1) Compare product to PCB files
(2) Compare PCB files to schematics
(3) Check schematics to understand what the circuit does and verify that it's what you want it to do

They don't want you doing that. No one want someone doing that to their product? The reason is simple. if you could do that, you could just build the thing yourself. and don't need to buy it from THEM.

See my comment above. Wink