Make your own charger for your phone. There are many ways to do this, in this projection I will show you how to do this using the LM2596
. The advantages of this charger are charging current of 3A, simplicity in the making, input voltage 7v - 40v. It can power directly from the 12v
battery. In this example I used a 14.4V battery
from a cordless drill.
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DIY USB charger for your phone - LM2596