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Have you haver need energy for charging your mp3, cellphone, etc. when you're out of home?!I had.. So i decide to describe how to build your portable charger.I ...
WHAT YOU NEED: - 5v regulator (i used a 7805) - Small piece of velcro - USB female port - 9v battery - 9v battery attach - A ...
This is the simplyest scheme you probably have ever seen.. Watch the image, put the regulator at the same rotation of the image. - On the first on ...
Should be like this..
So, now we have to fix it all on our box..I put a little piece of velcro under the battery and under the 5v regulator, hot glue under ...
Time to see if all works correctly..Attach the cable on the usb port, the other side on the phone, and.....magically.. IT WORKS!!Happy recharging with your easy-build 9v battery ...
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