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Entropy Device


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i was looking at a Simtec Electronics USB thumb drive device called the Entropy Key, which is a device to generate random bytes at a very high rate, and I was thinking how easy in concept it would be to make one. Maybe an arduino, couple of zener diodes and you got something working. The trouble I've run into is I want to run this off of the +5V from the USB port and the zener diodes don't cascade that well at such a low voltage. It would be better to be at +14V and I might be able to swing it working at +12V which there is probably more parts for. Does anyone know of a boost converter IC that will take a 5V up to these voltages?

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