Have you fried gadget or two by using wrong polarity power supply? Here is simple and efficient reverse polarity protector made out of just one P-channel mosfet.
People make mistakes and there is possibility that power supply will be connected backwards. Couple of possible reasons for that are: power supply has wrong markings, user doesn't pay attention or maybe someone accidentally presses the button that reverses PSU's polarity.
Depending on the circuit, that can cause some serious damage, but that can be avoided with simple reverse polarity protection circuit made out of P-channel mosfet.
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