Hey everyone, and welcome back to another Ben Builds instructable!
In this instructable, I will be showing you how to build a phone charger that is capable of outputting 5v @ 2A from a 12v car power port. This charger uses some fancy voltage tricks to tell the iPhone that it's an iPad charger when it's not. This makes the phone charge at 2 amps instead of the traditional 1 amp giving you double the charging speed! This does not hurt the phone at all as it is supported by the Apple charge management chip located inside the phone.
Ok then, lets get started!
Step 1: Watch the Video!
On the video I go over all of the steps in this instructable in detail and with moving pictures!
It'll probably help if you watch the above video before proceeding. Below is a materials list along with the schematic for building it.
Step 2: Materials?
For this project you will need:
An Altoids Tin
2 50k Resistors
1 75k Resistor
1 43k Resistor
DC-DC Buck Converter
Volt + Amp Meter with LED Display
Step 3: Prepare the Tin
Take the altoids tin and put a layer of electrical tape on the bottom to prevent short circuits and also drill and hole in the back right wall and cut a slot for the USB port on the left side.
The video demonstrates these procedures so you get them perfect!
Step 4: Build the Electronics
Follow the above schematics and the section in the video to build the circuit.
You'll also need to calibrate the DC-DC converter which can be accomplished by using your digital multimeter to measure the output of the DC-DC converter and using a small common screwdriver to turn the little brass knob until you get to 5.2v. This process was filmed and is in the video too.
Step 5: Meet Your Meter
Next, we need to install the Volt + Ammeter. This unit can be found inexpensively on eBay by searching for "LED Volt Amp Meter" and needs a hole cut in the case for it.
The meter was measured and an appropriate hole was cut using a box cutter. The meter was pushed in place and further secured with superglue.
Step 6: Glue and Wire It Up
Wire everything according to the video and schematics and use hot glue to glue the pieces in and you're done!
Thanks for reading and I'll see you in the next Instructable!
If you have any questions at all, please leave a comment and I will get back to you with an answer!