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CIRCUIT PROTECTS FROM BATTERY POLARITY REVERSAL


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

Circuit Reversed Battery Polarity Protection Circuit designed by David A. Johnson, P.E. (March 9, 2002)

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