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A bad thing happened
https://thejpster.org.uk/blog/blog-2021-07-01/
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It tried to turn on the main DC PSU and I got a short circuit. After a bit more testing, I realised there's a dead short through the two transistors that pull the DC PSU enable line up to VDC when the STM32 output goes to 3.3V(VSB).
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