USB Charger 9V

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Introduction: USB Charger 9V

Easy make portable USB charger

Step 1: Need

Need:

Case

lm7805 voltage regulator

batery clip

9V batery

USB

switch

pliers

soldering iron

glue gun

Step 2: Circuit

It's so EASY!!!

Step 3: Fold

Fold voltage regulator (lm7805) contacts

Step 4: Cut Wires

Cut wires from batery clip (4-5cm)

Step 5: Solder

Solder 2 black wires (from batery clip and witch cut off) to voltage regulator ground. Red wire (from batery clip) solder to voltage regulator input.

Step 6: Solder (part 2)

Red wire (witch cut off) solder to USB +. Black wire (witch cut off) solder to USB -.

Circuit is done!

Step 7: Cut Holes

With pliers cut holes to USB and switch.

Step 8: Glue It !

Glue USB and switch in holes. Voltage regulator glue to case wall.

Step 9: Done!

Enjoy and charge your device!

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    16 Comments

    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

    is this to charge the battery itself?