10 cell phone charger using 1.5V battery

Have you ever experienced going to other place and suddenly your cell phone turn off, and no power is available for you to charge your phone? Then try building this portable and emergency cell phone charger powered by 1.5V battery.

cell phone charger schematic 
cell phone charger


Charging your cell phone by 1.5V battery, how? 


For the cell phone to charge, charger output must be above 4V and can deliver a maximum current of 500mA. This charger circuit will step up the voltage from 1.5V to 5V DC to reach the cell phone charging requirement. The circuit uses only an AA or AAA 1.5v battery (1V to 2.4V).  The charger is composed of simple oscillator, a rectifier, and voltage regulator. The feedback winding F is composed 5 turns of #30 AWG magnetic wire and main winding P is composed of 6 turns of #24 AWG wire. The 5.1V zener diode and 2200uF capacitor regulates the output voltage to ensure proper charging.

The windings are not critical, you can experiment using different number of turns. If ever the charger doesn’t have any output, try to reverse the winding connection.

Note: This charger is functional but provides no warranty on its accuracy. Try building at your own risk.
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10 comments:

  1. AnonymousDecember 28, 2010 at 5:55 PM

    amigo sera que pordrias explicarme como hago la bobina y que materiales necesito yo dispongo de un inductor que e sacado de una lapara cfl

    ReplyDelete
  2. AnonymousDecember 28, 2010 at 5:57 PM

    Friend will explain how I do it pordría the materials I need coil and I frame of an inductor and out of a cfl Lanpo but I need to know how to connect different wire coils thank you very much
    my name is daner

    ReplyDelete
  3. DH-gmDecember 29, 2010 at 6:36 PM

    Daner good day!
    thank you for raising your problem.
    Recycling the core in defective CFL is good choice.
    Regarding on the steps on how to connect the wires, kindly refer to the steps in my
    1.5V charger project

    ReplyDelete
  4. AnonymousOctober 10, 2011 at 3:19 AM

    any kind of information about how much current it draws and the output current?
    It shout be around 100 mA, right?

    ReplyDelete
  5. DH-gmOctober 10, 2011 at 7:23 AM

    Regarding on the output, based on my testing its around 150mA plus using my old nokia 3310 with small modification in the parts.Its input is around 0.5A (not sure if the ammeter is working well that time). The problem is it's very unstable. There are some reports also from other users that there are cellphones that are not charging using this charger . If you are going to build it, just use it in emergency cases only.

    ReplyDelete
  6. DevarajJanuary 17, 2012 at 11:34 PM

    Sir,you have shown only +ve terminal of 1.5v battery.But to where should connect -ve terminal of the 1.5v battery?

    ReplyDelete
  7. DH-gmJanuary 31, 2012 at 4:14 PM

    The negative of the battery input is the same with the negative side of the output. From the drawing, you can connect the negative of the battery to the emitter of the transistor or negative of the 470uF capacitor.

    ReplyDelete
  8. AnonymousMay 24, 2012 at 9:53 PM

    Is there a simple oscillator u can buy from a store ?

    ReplyDelete
  9. المبرمج عبير سالمFebruary 3, 2015 at 10:34 PM

    i am making this but find broblem is not fixed voltage and not charger

    ReplyDelete
  10. المبرمج عبير سالمFebruary 3, 2015 at 10:36 PM

    i am making this but find broblem is not fixed voltage and not charger

    ReplyDelete

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