Charge Your Phone With a Car Battery (6V-24V)

Charging your smartphone while camping outside is not always easy. I am showing you how to charge your phone by using a car battery and a moped battery. You can also use the gadget with any kind of 6V-24V power source.

Step 1: Watch the Video!

The video already talks about the most important facts. But I will also give you some more informations about the project in the next steps.

Step 2: It Is Time to Choose Your Circuit!

You may have noticed that I build 2 cicuits inside this gadget, which basically have the same function. But they have their own pros and cons:

LM7805:

+ very simple, perfect for beginners

+ very cheap

+ useful when you only need a little current

- efficiency is horrible with higher voltages (24V --> 21%--> becomes a heater)

(12V --> 42%--> not nice)

LM2576:

- more complex circuit

- more parts, more costs

+ efficiency is quite good for a DIY phone charger (around 80%)

You can decide which one you want to use or maybe you build both. It is up to you.

Step 3: The Simple Way: LM7805!

Get your parts here (affiliate links):

Ebay:

LM7805:http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

Capacitor Kit:http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

Amazon.de:

LM7805: http://amzn.to/1rFtsve

Capacitor Kit: http://amzn.to/1vEZGGc

You only need 3 parts for this circuit. If you got all the parts then follow the schematic to create your circuit. Feel free to store your new gadget in an awesome case.