cellphone charger using 1.5V battery

Cell Phone Charger Using 1.5V Battery

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. This is similar to the Joule Thief circuit.

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.

Cellphone charger circuit schematic

circuit schematic of the cellphone charger using 1.5V battery

My opinion is that this can charge the cellphone battery only for short period of time because the 1.5 volt battery power capacity is much lower than the phone’s battery.

This article was received from Subham Chatterjee. Thank you!


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  • Subham Chatterjee

    hello, i designed this ckt.I made it at my home. if we change the zener from 5.1v to 8.1v the output will not come & the source battery will drain out with in few minutes.
    the 5.1v zener is suitable to charge mobile phone. I agree with Mr. SAGAR SEN that the transistor may be changed into 2222.
    battery supply you may give 1.5v to 3v.

  • iuliu19

    Salutare la toata lumea . Acest articol este ideal .mai bine de asa cred ca nu se poate . Oare daca se pune un Darlington (EX. BD678a ) se va mari tensiunea de iesire ? (evident ar creste si curentul ).iuliu19

  • ken bion

    Pls I bought a battery bank,but it no longer charges my phone,,,,but it lights an led what do I do?

  • Raju Patel

    what value if PF in this circuit

  • arghya sarkar

    where is the negative input point?

  • Jayson

    what is the diameter or size of the tube where to wind the magnetic wire ?

  • Jayson

    can any one help me .. what is the voltage of the 2200uf and 470uf .. tnx in advance for the answers ..

  • Jayson

    Sir Mitra, can this circuit funtion if i put a solar cell. the solar cell is transistor 2n3055 (12pieces)in series connection ?

    • Jid

      Sir Jayson, were you able to work on your project which uses a 2n3055 transistor as solar panel to charge a cellphone??? I’m working on the same project. Your help will be very much appreciated. Thanks.

  • Jayson

    can this circuit funtion if i put a solar cell. the solar cell is transistor 2n3055 (12pieces)

  • Heena

    Also want to add LED on until fully charged, after that should be off

    • C.Mitra

      Hi Heena, the normally available 9V battery will not give you enough POWER to run your mobile for any length of time. You need a really BIG battery to use with this circuit. Nowadays batteries for charging cell phones for emergency purposes are available, these are called Power Banks, you can check in any online shopping website. They are huge batteries. So I think you should forget about using this circuit for charging your cell phone. Please read my detailed explanation of September 28, 2012 above.

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