Homemade Cell Phone Emergency Charger Pack Circuit
It frequently happens, our wireless goes into a low battery condition right amidst a vital discussion, and much more dreadful it happens while we are voyaging or arranged in some remote open air area where there's no charging office accessible. Regardless, this little pack will give your mobile phone a quick refill each time it has a tendency to get level outside.
We all realize that at 3.7 V DC, a mobile phone battery is thought to be completely charged.
For charging it at the above level a charging source needs to give around 4 to 5 volts to the released wireless battery.
Since here we are talking about a vitality exchange from one battery to the next or rather from some force source to the mobile phone, we have to have some kind of chargeable battery pack which would create the obliged 4 volts and which could be utilized at whatever time for charging a level PDA just by incorporating the two together.
The above crisis battery pack can be effectively made by putting four Ni-Cd cells in arrangement.
How about we figure out how to do it.
It's not troublesome, you would oblige four 1.2V Ni-Cd AAA penlight cells, a four cell holder get together and a 1 Ohm 1 watt resistor.
We all realize that at 3.7 V DC, a mobile phone battery is thought to be completely charged.
For charging it at the above level a charging source needs to give around 4 to 5 volts to the released wireless battery.
Since here we are talking about a vitality exchange from one battery to the next or rather from some force source to the mobile phone, we have to have some kind of chargeable battery pack which would create the obliged 4 volts and which could be utilized at whatever time for charging a level PDA just by incorporating the two together.
The above crisis battery pack can be effectively made by putting four Ni-Cd cells in arrangement.
How about we figure out how to do it.
It's not troublesome, you would oblige four 1.2V Ni-Cd AAA penlight cells, a four cell holder get together and a 1 Ohm 1 watt resistor.
The above holder would generate a voltage of about 4.8V at its wire terminals with four AAA 1.2 Ni-Cd attached to within the given slots correctly.
The 1 Ohm resistor can be connected at the center of the red wire by cutting the red wire at the center and bridging the resistor terminals such that it comes in series with the red wire. The resistor should covered under a plastic tubing or sleeving.
The red and the black wires of above assembly should be terminated with a suitable cell phone charger-pin so that it can be easily inserted into the cell phone charging socket whenever required.
Now let's learn how we can charge the above emergency battery pack at home.
Ni-Cd cells can be charged safely for about 10 to 14 hours using a constant voltage charger at C/10 rate. The very useful 7805 voltage regulator IC can be used here for charging the Ni-Cd battery pack.
The following diagram shows a very simple Ni-Cd charger circuit which can be used for charging the above battery pack so that it remains in a standby position and can be taken outdoors in the form of an emergency cell phone charger unit.
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