In this instructable, I setout to create a mini USB mobile charger
How to manufacture your own phone charger
that can charge a cellphonewith just a 9V battery. Local Shop: Two bottle caps, an old 9volt battery, spray paint and connecting wires. Cut a slit in the center of the cap toaccommodatethe female USB connector. Make a hole in the middle of the second cap. Solder the wires to pin1(VDC) and pin4(ground) of the USB connector.Insert the USB connectorinto the bottle cap as shown in the image above and secure with hot glue.
Take the 7805 voltage regulator IC.Solder the Vcc wire from the USB connector to the output connector(pin 3) of the IC7805. Similarly, solder the Gnd wire to the Gnd connector(pin 2) of theIC 7805 .a hole in the side of the bottle cap.Insert the LED into the hole and secure with hotglue. Connect #039;-ve' LED footfor Gnd 7805 ICconnector. Connect the other leg to the input connector(pin 1) of the 7805 IC. Take theclipfromthe9V battery connector and stick it on the surface of the second bottle cap. Note: You can easily removethe connector from your old 9V battery by watching this video.Join '+ve' Battery terminal to the input terminal (pin 1) of the 7805 IC. Connect the -ve battery terminal to the Gnd terminal of IC7805. After checking all the connections, hotglue the two bottle caps together. Connect the9V battery to the charger. Plug the USB cable into the USB port and connect it to the mobile phone.
The mobile device startscharging and the backup depends on the quality of the9Vbattery. A good quality battery can charge 15-20%of a 3000mAh mobile phone battery. Note: This device can also be used to charge amobile phone with any 12V wall adapter in anemergency.Withavoltageregulator,the 7805 suppliesyourphonewitha regulated 5V.If you missedit,watch the video and findout how I made this mini USB charger at home.I also made a portable emergency charger which is also very useful.
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