Introduction: 5V DC Power Supply for Breadboard Using Phone Charger

Hello Everyone,

In this instructable, I will be showing how to make a very simple 5V DC power supply for breadboard to power your circuits using an old (or a new) USB phone charger. Phone charges usually have an output DC voltage of around 5V . So let's get started.

Step 1: Materials Required

Most of the parts used can be found laying around in our homes. Below is a list of materials I needed.


1) An Old ( or a new) USB phone charger with cable.

2) BreadBoard

3) Single strand wire

4) Multi meter (to test the output)

5) Wire cutter

6) Solder (optional, makes things more convenient)

Step 2: Altering the USB Cable

This is the major part of this simple project, once done , the project's almost completed.

Cut the USB cord into two using a wire cutter . Here we will be using the part that fits into the USB charger. At the cut end remove a part of the insulation using a wire cutter or a blade (Be careful while using a blade). The USB wire has four smaller wires inside the outer layer. Out of which , two wires are used to transfer data (here they are the white and green wires) and other two carry current/power (here, they are the silver and red wires . Refer to the 4th picture in this step to see what I mean.) these are the wires we need. This may vary from wire to wire, so determine the power wires using a multi-meter. Cut the data wires . We will end up with the two power strands.

Step 3: Soldering the Wires and Connecting to the Phone Charger.

Solder the power wires of USB cord to two separate single strand wires. This is mainly done to make it more convenient while connecting to the breadboard. Remember the insulation we removed earlier, it can be used as a jacket to cover the soldered part.

Finally connect the USB cord to the phone charger.

Step 4: Connecting to the Breadboard, Powering on and Testing the Supply.

Connect the two single strand wires to the bread board and switch on the power supply and now we have a 5V dc power supply to power our circuits .

In my case the output voltage was fond to be 5.20 +/- 0.05 V.

PS: The same method can be followed to power any other device that need 5 volts(or less, using suitable voltage dividers) to run.

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