I am trying to do reverse-polarity protection on a 24V PCB. I read up on the PMOSFET method and I thought I had understood it, implemented it as follows:
If I connect the power supply correctly, the board works fine (so the circuit allows power through). But if I connect the power supply with the wrong polarity, it doesn't appear to protect it (luckily it's just passives after that component, but they become quite hot and obviously that shouldn't happen if they are being protected).
Any suggestions? I am confused.