Emergency Cellphone Charger

Discussion in 'The Projects Forum' started by Lightfire, May 24, 2011.

  1. Lightfire

    Thread Starter Well-Known Member

    Oct 5, 2010

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

    Cellphone battery charger ratings:
    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?

  2. Wendy


    Mar 24, 2008
    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.
  3. iONic

    AAC Fanatic!

    Nov 16, 2007
    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!
  4. Lightfire

    Thread Starter Well-Known Member

    Oct 5, 2010
    But I want to create it by myself. Can somebody give me a schematic for this? Pls. :)
  5. Audioguru


    Dec 20, 2007
    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.