Simple USB Charger Circuit

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In this tutorial, we are demonstrating a USB portable charger. Which can use to charge a mobile phone, iPod, Mp3 player, etc. just with a 9V battery. So next time when you find yourself in a problem and you need to charge your device in an emergency. Simply purchase a 9V battery at the corner shop and you will have enough capacity to deal with emergency circumstances.

This is a versatile battery-power USB charger circuit. This circuit can charge your PDAs, iPods, Mp3 players, and any gadget that connects to a PC USB to charge. On the off chance that you fit this circuit in a small box with a 9V battery then it will end up being a portable emergency USB charger.

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Hardware Components

The following components are required to make USB Charger Circuit

S.no	Components	Value	Qty
1.	Voltage regulator IC	LM7805	1
2.	Female USB Plug	–	1
3.	LED	–	1
4.	Resistor	1K	1
5.	Ceramic Capacitor	100nF	2
6.	Electrolytic Capacitor	100µF, 47µF
7.	Battery	9V	1

LM7805 Pinout

For a detailed description of pinout, dimension features, and specifications download the datasheet of LM7805

USB Charger Circuit

Working Explanation

The circuit fabricates with the help of the LM7805 chip. It is a voltage regulator that gives an output of 5V and 1A of current by taking an input of between 7V to around 30V.

The schematic is so straightforward and simple. It is not utilizing any expensive components. So you can make this circuit in certain minutes if all parts are accessible to you. The circuit is utilizing a low voltage regulator IC LM7805. Which is effectively accessible in the market and it is additionally extremely modest. The circuit takes voltage from the 9V battery and steps down the voltage into a DC 5V yield output.

The USB charger circuit works from 6 AA batteries, 6 AAA batteries, or a 9V battery. These batteries are easy to find in many general stores.