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A SIMPLE PORTABLE POWER BANK WITHIN THREE STEPS.

Step 1: THINGS YOU NEED

7805 IC

1K resistor

LED

USB Port

Battery

battery adaptor

Step 2: CIRCUIT

Make sure that the circuit is connected exactly resembling the diagram.

Step 3: FINALLY

Connect the phone to the USB port with a USB cable.

THANK YOU

is it possible to connect a solar cell to it? as long as it is under 5 volts? that way you can just charge straight from the cell without using any batteries?
Is the 7805 ic just a regulator
<p>how can you recharge the battery source???</p>
<p>You might want to explain to readers what the 7805 IC and 1K resistors are for.</p>
<p>Ok. Thank you</p>
<p>Nice power bank. You could also use an LM317 chip to make the output adjustable.</p>
<p>Thanks</p>
But you wouldn't want an usb port with adjustable voltage ;-)
<p>is it possible for 12v. like connecting the circuit to your car battery?</p>
<p>Yes,you can use it.</p>

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