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Student
 · MangaluruIndia
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Made a simple device which can charge the phone! according to calculation it should charge around 500mah but its not working practically il update this device with some small changes which can charge the phone full!

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Ezio
 · MaduraiIndia
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Its cool bro! can you explain your project and how you did this?

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Electronics Engineering Student
 · KolkataIndia
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I guess you are using Voltage Regulator IC 7805. The disadvantage of this IC is that the regulation of voltage is done by dissipating some amount of power, thus decreasing efficiency. In your case the efficiency turns out to be n=(5I)/(9I)=5/9=55%. Given the charge capacity of the 9V battery to be 500mAH, of which only half goes into the cellphone battery of capacity >2000mAH. So you can expect only a charge amount of 10% of the cellphone battery.

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Student
 · MangaluruIndia
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I See

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Engineering Student, Arduino Enthusiast..
 · New YorkU.S.
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+Nikshep Amin and +Souvik Baksi good work so far guys can’t wait to see what the finished circuit looks like#Circuit Design

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