Emergency Cellphone Charger

Thread Starter

Lightfire

Joined Oct 5, 2010
690
OK,

Here are the specifications/ratings of the important devices.:D

Cellphone battery charger ratings:
860mAh
3.7V 3.2Wh

Cellphone charger ratings:
INPUT: AC 100-240 V.
50-60 Hz. 60mA
OUTPUT: DC 5.0V 350mA

My target emergency cellphone charger
INPUT: DC 6-12 V.
OUTPUT: DC 5.0V 350mA
(needs suggestions, please).

Can this be made? If yes (I hope), what would be the required items to do that?

Thanks,
 

Wendy

Joined Mar 24, 2008
23,408
Yep, but you can buy them off the shelf very cheaply. Many cases it is much cheaper to buy off the shelf than to make one.
 

iONic

Joined Nov 16, 2007
1,662
OK,

Here are the specifications/ratings of the important devices.:D

Cellphone battery charger ratings:
860mAh
3.7V 3.2Wh

Cellphone charger ratings:
INPUT: AC 100-240 V.
50-60 Hz. 60mA
OUTPUT: DC 5.0V 350mA

My target emergency cellphone charger
INPUT: DC 6-12 V.
OUTPUT: DC 5.0V 350mA
(needs suggestions, please).

Can this be made? If yes (I hope), what would be the required items to do that?

Thanks,
I guess it would be nice to know what the emergency situation would be that would cause you to need a charger you already have?

With this said, are you looking for some sort of portable charger that you could use that would work if you did not have access to a home outlet or car cigi lighter or a spare battery? Exactly what would be cheaper as all these options are available and not to expensive. if you don't already have the parts, it will probably end up costing more to build than to buy a spare battery!
 

Audioguru

Joined Dec 20, 2007
11,248
The battery in the cell phone is 3.7V, 860mAh and 3.2Wh.
The charging circuit is inside the cell phone.
The power supply for the charging circuit is simply 5.0VDC at 350mA.

You can buy one or make a power supply with a transformer, bridge rectifier, main filter capacitor, 7805 voltage regulator IC and two capacitors shown on its datasheet.
 
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