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The GaN evaluation kit I have here at home died because of a power disruption @Cumps Castle.     There was a power failure in the perk of Brussels where I live. Power dropped from 240V to 110. And here's the rub: I was providing the different voltages to the evaluation board from two different power supplies. The big power from a supply that takes virtually any input voltage between 100 and 250V. But the bias power came from a supply that's 220-240V only.   TL;DR the LMG5200 ...