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Last Updated on: Tuesday, June 01, 2021 03:06 PM

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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 Circuit Below to view PDF of Schematic


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