May 072013
 

Phone Line

What do you do if the power is out, but you need to charge your cell phone to make an emergency phone call? I show you how to tap the power flowing from your phone line.

There is a small amount of electricity that is constantly available in a phone line. This is what powers traditional corded phones. Because the phone system is independent of the power grid, the phone line generally even has power during a black out. While this is not a lot of power, it is enough to charge your small electronics such as your cell phone or other USB device. All you need is a simple voltage regulator circuit.

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