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This simple circuit can protect a sensitive electronic circuit from an accidental
connection of a battery with a reversed polarity. The N-channel FET connects
the electronic device to the battery only when the polarity is correct. The
circuit shown was designed for a device powered from a single 1.5 volts button
cell battery. However, the circuit will operate with higher voltages as
well.
Click on Drawing Below to view PDF version of Schematic
