Every innovations starts from a simple day to day life problem like you watching IPL in TV and suddenly the current shuts off, fortunately you will find another way to watch the match via mobile network. Similarly, I too had faced a problem of frequent drains in mobile battery while travelling somewhere in bus or while walking on the endless roads to our destination during hot sunny day. There are many innovative projects on wind powered mobile charger which looks huge enough to produce 5v dc but they weighs more and bulky. I gathered some information from them for my project and started with a basic 12 volt DC motor. I used it to generate power for my mobile phones,and it ended up with failure.Then I used an feedback amplifier circuit but it was so huge. Read More.....