Charge Your Cellphone From 9V Battery

Introduction: Charge Your Cellphone From 9V Battery

Many times it happens that we forget to carry power bank with us and our mobile also run out of battery, In this instructable, i have build a simple yet useful circuit by which you can charge your cellphone from general purpose 9V battery or a 12V battery.

The circuit uses only few components and is very cheap and portable.

Step 1: Components Required

Following components are required to build this circuit

1) 7805 IC

2) 9V battery

3) Small Heatsink

4) Wire

5) Female USB connector

Step 2: Schematics

In the schematic shown, 7805 IC is acting as a heart of the system.

7805 IC is a very cheap 5V linear regulator.

Being a linear regulator, you can't expect high efficiency from 7805, but yes it can save your life sometime.

Step 3: Connections and Setup

I mounted the 7805 IC on a small heatsink and then i secured 9V battery connector on the top of the heatsink using glue gun.

I also secured the female USB socket on the heatsink using hot glue gun.

Step 4: Testing the Circuit

By this time, the setup was almost complete and was ready to be tested.

I connected the circuit to the 9V battery and then used a USB cable to connect the circuit to the cellphone, the cellphone started charging as can be seen in the image.

Finally the project was successfully completed.

Be the First to Share


    • Tiny Things Speed Challenge

      Tiny Things Speed Challenge
    • Paint Challenge

      Paint Challenge
    • 3D Printed Student Design Challenge

      3D Printed Student Design Challenge



    Question 2 years ago

    What phones can be charged by this 9v batteries? I have a NiMH battery. Can it be used to recharge such phones?