Battery
mobile charger:
Here is an ideal mobile charger using 12V or 9V
battery to charge mobile phone while traveling. It can replenish cell phone
battery three or four times in places where AC power is not available.
Most
of the Mobile phone batteries are rated at 3.6 V/500 mA. A 12V battery that i
have used here can give 1.3Ah of current. When power is applied to the circuit
through a input capacitor, IC L7805CV conducts (regulating IC)and Green LED
lights.
The
input voltage to IC will be of 12V and output voltage is 5V,this voltage
is sufficient to charge the mobile,tabs etc.The IC stops conducting
if the potential of battery falls below 7.2V.
Here i have used
10 micro farad capacitor at input and output of the IC
and connected USB at the output of the IC with 100 ohms resistor
to D+ and D- of the USB.The regulating IC regulates the
voltage and it can regulate up to 50V.
See through that you
put a good heat sink to the IC. This circuit can also work with 9V battery.
These are some images
of this device:
Enjoy!!!!!!!!!
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