Simple USB Charger

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Introduction: Simple USB Charger

note: you can't depends this charger Except in emergency cases because it may affect on the life span of the battery

Step 1: Component That You Need

1- 9v battary

2- battary Socket

3- 100nf capacitor (2)

4- 100mf capacitor

5- 74mf capacitor

6- resistor 470ohm

7- led

8- USB socket

9- regulator lm7805

10- switch

Step 2: The Circuit

you can build your circuit online at this site

www.circuitlab.com

Step 3: The Final Result

After connecting the circuit it will be like that and it will be ready to charge your mobile

Step 4: My Mobile Connected to the Charger

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    9 Comments

    how many hours does this circuit take to charge :)

    Most smart phone batteries are 1500-3300mah.

    A 9V battery has 50-400mah and at 500mw load has less than 300mah capacity.

    You're also losing 30% of that 300mah thru the 7805 as heat.

    Just exactly HOW much does this remaining 210mah charge your phone ???

    Ref : http://www.powerstream.com/9V-Alkaline-tests.htm

    9v battery gives about 400 to 500 mA per hour

    to Slow the charging process as much as possible