Don't throw away you damaged chargers instead DC voltage buster 3.7v to 12v DC  

Voltage Booster measures the existing volt- age continuously and if necessary, activates its boost function. Boosted voltage is based on an auto-transformer, the ratio of which can be changed step by step with semiconductor switches.
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#invention #electronic #diy #experiment #electrical
#voltage booster #home made
#mobile charger
#C1815 Transistor
#25v 220micro farad capacitor
#1.4k resistor
#high frequency transformer
The C1815 is a high voltage and high current NPN transistor. A transistor can normally be used as a switch or amplifier, but this transistor is commonly is used only for audio frequency amplifier application since it has a very high dc current gain value of 120-700.