In this tutorial Im going to show you how to build a simple portable mobile charger. This has a USB output so you can you can plug in various types of mobile phones. So you can stop searching for a charger and start sharing. More ever this is portable and can fit in ur pocket easily . This charger gives a constant output of 5v at 1amp.
Step 1: Parts
2)USB input pin
3)Rechargeable 9V battery
4)A case to get all of this in.
6)Power input pin (see the pic)
Step 2: Circut
This gives us three modes of operation one internal battery charging , off and then an USB charger .