How to Make a Mobile Charger




Introduction: How to Make a Mobile Charger

About: Hello Guys, I am techgenie, an Electronics hobbyists, tech tinker and developer. I dedicate my free time in designing and making various creative and innovative projects, RC toys, Incredible Gadgets, Awesome...

Don't have a mobile phone charger and the battery is about to drain..?

Make an Emergency Charger yourself at home to charge your device from nothing but a 9v Battery.

This video shows a simple way to learn how to make a mobile phone charger at home very easily.

Note: A normal zinc carbon battery will not give much backup and will get drained out fast. So, its recommended to use rechargeable batteries.

Step 1: Components Required

  1. General Purpose PCB Board -
  2. 7805 Voltage Regulator -
  3. 100 uF capacitor -
  4. 10uF capacitor -
  5. Female USB Port -
  6. 9v Battery -
  7. A Battery connector clip -

  1. General Purpose PCB Board -
  2. LM 7805 Voltage Regulator -
  3. 100 uF capacitor -
  4. 10 uF capacitor -
  5. Female USB Port -
  6. 9v Battery -
  7. Battery Connector Clip -

  1. General Purpose PCB Board -
  2. LM 7805 Voltage Regulator -
  3. 100 uF capacitor -
  4. 10uF capacitor -
  5. Female USB Port -
  6. 9v Battery -
  7. Battery connector clip -

Step 2: Procedure

1. Refer to the circuit diagram of the project.

2. Insert the clip on PCB board and paste it using hot glue.

3. Solder the connector to the base.

4. Solder a 100uF capacitor parallel to the connector clip.

5. Refer to the pin configuration of 7805. Solder the IC on the base such that, input pin is near the capacitor and connect input pin to +ve terminal of capacitor.

6. Take a 10uF capacitor and solder the +ve terminal to the output of 7805 I.C.

7. Refer to the pin configuration of female USB port. We have 4 pins

  • pin 1 - Vcc
  • Pin 2 - Data (-)
  • Pin 3 - Data (+)
  • Pin 4 - Ground

8. Solder the port to the base and connect pin 1 to the +ve terminal of 10uF capacitor.

9. Make all the ground connections.

Step 3: Mobile Charger Is Ready

Our Mobile Charger is now ready.

Note: Use it only in case of emergency, for regular charge, use normal wall charger.

Attach a 9v Battery and connect the mobile phone using a USB cable, we see that, the mobile charges well.

Make this amazing toy yourself and contact us or share your experiences on our facebook page, twitter and instagram. You can also SUBSCRIBE to our Youtube Channel GOODTECH - Creativity And Science, where i frequently post new and creative content.

Thanks for your Support..!!



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    28 Discussions

    Can u please make this charger using the bridge rectifier

    Don't do with regulators like 7805 try other regulators, as in this 7805 burns more energy in bringing 9v to 5v in form of heat and battery is also expensive. Joule's thief is also nice concept you should think about it.

    but neat and clean work nice keep it up :)

    6 replies

    what is meant by other regulators....?????

    can u plz say about that

    Thank you for appreciating my work..:) Yes, 7805 do get heated up and loses more energy but it is very commonly available and moreover this is only an emergency charger..:-p

    Thanks for suggesting about Joule's thief, will look into it soon. Can you suggest me some nice joule's thief projects or some verified links..?

    Is that i can use other voltage regulator

    The Joule thief circuit isn't overly efficient, what it gets you is it lets you discharge batteries far further. For example, your circuit will stop working after a 9V battery's voltage sags much past 7V, which tends to leave a lot of power in the battery. The Joule thief will drain the battery down to ~1V, using up all power you could reasonably extract from any given battery.

    However, the big downside to Joule thief circuits, is they will destroy rechargable batteries, because the battery will be discharged far past it's minimum voltage; not many rechargable batteries can handle more than a couple deep discharge cycles, and Lithium batteries in particular can detonate when recharged after being over-depleted.

    9V batteries have terrible properties for this circuit, even with a rechargable model, you'll probably only extract maybe 100mAh from the battery before the voltage drops below what the 7805 can regulate. That's barely enough to turn on the "charging" indicator light for more than a few minutes, and wouldn't even charge more than 2% of my cell phone's battery; nowhere near enough to place a call, and barely enough to send more than a handful of SMS messages.

    A better choice would be 5x or 6x AA or AAA batteries; not only are
    those sizes more common and cheaper, but they store FAR more energy, and
    if you use 5x batteries, then the 7805 will waste less power as heat.

    i need some help, my tablet charger looks fine, but when i switch it on, and check my tablet, it doesn't have the lightning bolt, and i cant charge it. =( PLZ HELP!!

    hope u can do this request. >.<

    find out similar articles here

    find out similar articles here

    Rulof Maker made a better one on YouTube


    2 years ago

    What voltages are the capacitors rated at? Pls reply

    1 reply

    The voltage of capacitors does not matter if it is rated above the input supply voltage. However, i have used 100uf, 25v capacitor and a 10uf, 16v capacitor.

    I tried this two years ago. Do not use normal batteries, battery discharge ...

    I don't recommend this.
    1 reply

    I have written in above instructables that it is not recommended to use normal batteries. You must use rechargeable and high current batteries (Li-ion preferably).

    Also, you can input voltage from any DC charger lying around and get a regulated 5v supply for your mobile device.


    Reply 2 years ago

    We have to consider that "Volts" parameter is not enough, mAh (electric charge) must be take in account for a charger. A 2500mAh AA battery is capable to deliver 2.5A during 1hour or 1.25A in 2 hours. Is that sufficient to fully charge iPhone or another one type? iPad certainly not.

    For Apple devices just join together Pin2 - Pin3 then all 5.1V / 2A supply work fin with.