It is a device that will charge your phone & other other devices that plugs into a USB to charge.

Make it and enjoy.

It can charge your phone up to five time in one full charged battery.

You can charge 4*3 Volt battery with your Nokia mobile charger. It will take time to charge.

Ones it is charged it is ready to charge your phone 5(approx) times. :)

Step 1: Requireed Items

You will require:

LM or MC 7805 +5VDC Voltage Regulator
Heat Sink(Optional)
Type-A Female USB Port
100uf Electrolytic Capacitor 10-50V
0.1-0.5uf Capacitor 6-50V (any type would do)
100-160 ohm Resistor
12(4*3)V Battery(Series Connection)
2.2V 20mA LED color of your choice
Bread board
Pref Board
3 Pin Switch...etc which are present in picture

Step 2: The Circuit Diagram (Simple)

The following picture shows the sketch diagram of Circuit which we want to make.

Step 3: Attaching the Components

First attach all the components on Bread Board and check the output(O/p) is 5V by Multi-Meter or we have 5V O/p Checker. Then Place it on PVC Board and solder it with the help of soldering components Like the picture.

Step 4: Adjustment

Do some holes in the box for switch, Charging Point and USB Hub. Do some adjustment in your box and make it fixed with the help of Hot Glue Gun.

Step 5: Done! ;)

Now that you've finished building your own USB charger, all you have left to do is to put batteries in box and use it.

Remember when you add batteries in series then it will give you sum all voltage and if you connect all batteries in parallel then it will give you sum of all Amp. .

Ones it is charged it is ready to charge your phone.... ;)

Step 6: Demo!

Check It out...... It's Working Properly....

Step 7: Ugrade

In this step you will see a how to upgrade you USB Charger..

Since when you insert your charger and switch is not on then charger LED and capacitors are taking voltage from your battery.

So we put a Zener Diode or an Ideal Diode to save your battery. Here I used Zener Diode of 12 V.

Now question Comes What is an Ideal Diode and Zener Diode??

An Ideal Diode is a diode which allows current to flow in the forward direction but not permits it to flow in the reverse direction.

A Zener diode is a diode which allows current to flow in the forward direction in the same manner as an ideal diode, but also permits it to flow in the reverse direction when the voltage is above a certain value known as the breakdown voltage, "Zener knee voltage", "Zener voltage", "avalanche point", or "peak inverse voltage".

Do connection as like in picture first........