DIY Portable Smartphone Charger

Here’s a simple circuit which you can use to charge any device that uses a USB charger. (Smartphones, Tablets, Portable music players, etc.)

Step 1: Get the Components

• Soldering board (1)
• Voltage regulator 7805A (1)
• 9 volt battery (1)
• Battery snap (1)
• Solid wire - White/Black colour (2 cm)
• Solid wire- Red color (2 cm)
• Female USB connector – Type A

Step 2: Tools Required

• Soldering iron
• Wire cutter

Step 3: Put It Together

Assemble and solder the components as shown in the diagram.

Step 4: How It Works

The 9 volt battery is connected to the battery snap.

Such batteries cannot be used to charge any device directly (because the device will blow), so an IC is used to reduce the voltage to 5 volts.

The power now goes to the USB connector, from where any USB charger cord can be plugged in.

Step 5: The Finished Model

The next time your smartphone is running low on charge, introduce it to your homemade charger!