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Function of diode in the circuit.

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i200yrs

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Hello everyone...I am doing some troubleshooting and tried to sketch schematic by my own. I would like to know the function of this diode (D1) in the image. I know diode but first time saw this circuit. Thanks in advance.

diode2.JPG
 

it protects the circuit from wrong polarity insertion of Battery1.
 

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