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What is this diode doing?

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Thread Starter

moeburn

Joined Aug 16, 2013
31
Very basic question here. I have a guide on how to take the wireless controller receiver card out of an Xbox 360 motherboard, solder a USB cable to it, and plug it into a computer to use the wireless controllers on a PC. The guide says to use a 1n400x diode in between the red +5v USB wire, and the vIn pin on the board.

What is this diode for? Is it just a safety thing, to prevent current flowing in the wrong direction in case you accidentally solder incorrectly and fry your PC's usb port?
 
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