Introduction: Portable USB Smartphone Charger V3

Hi Instructables audience!

In this instructable i'm showing you how to make simple usb charger.

This is my 3'd version for this kind of charger and this one is upgraded to allow voltage to flow on stable 12v and no backward flow.

Basicly this one works on it's full potentional ,without any possible way to dry you phone/electronic batterie because of diodes and voltage regulator.

Step 1: Gathering All Parts.

For this project i'm using standart 12v usb car charger ,LM7812 voltage regulator , two diodes and 9v batterie clips.

Step 2: Hacking Housing and Soldering Parts Together.

You'r going to need to fully disassemble charger and remove metal connector from + terminal and metal bracket form USB which is used as ground.

Then trim transistor leads to acceptable size and saw off excess metal witch is used as heat sink ,batteries dosent pronounce as much voltage to heat it so much, and as we assemble the build ,USB metal shielding will act as our heatsink instead.

Solder diodes to right polarities and then solder 9v batterie cilps in series to provide 18 volt input and then solder it to voltage regulator witch will drop voltage to 12v , diodes you added earlier wont let voltage to go backwards from phone to charger.

After you have done all this you'r ready to use your charger! Just glue all in place and close charger case.

Step 3: Video

And here is little video with all steps and extra pictures.

Test in the end of video.

Thanks for reading! ;) Cheers!