You may not have noticed them anymore, but if you look around, you've at least one telephone cable at your home You must have thought that they are useless but they are not. The interesting part of it is yet to come.
While a cell phone is incredibly convenient, without a charged battery it's just useless weight. If a storm causes a power outage in the area, I'm not looking for candles and flashlights—I'm figuring out how to charge my Phone!
Now lets see how to use your useless telephone cable to charge your cell phone.
However, something we all have old land line jack. Corded phones don't need to be plugged into a power outlet; they actually get enough power to operate from the phone line itself. When the power goes out, land lines will still operate on their secondary source of power feeding from the telco. Meanwhile our cell phones will slowly drain and die.
There is a simple trick to put your old landline jack to good use and convert into a emergency power supply for your phone.
You'll need a regular USB cable, your cell phone's USB charging cable, an available phone line, a phone cord, a voltage regulator, and a multimeter.
The multimeter is used to check the voltage of the jack in question and the voltage regulator keeps the output at 5V. The regulator makes a simple circuit with the phone cord and USB cable to convert the phone signal into power that your phone can use.
Check out this video guide by Make to see how it's done.
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