Instructables

Use your evo 4G with a Touchstone charger

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This Instructable is to show you how to add inductive charging to you HTC Evo 4G phone without voiding the warranty.  Your phone will remain unaltered.

Basically what we are going to do is take a Powermat inductive charging back cover for the Evo and replace the inductive charging coil with one out of a Palm Pre Touchstone charging cover.

I had a Palm Pre a few years ago and one of the best things about it was the Touchstone charging system.  Since I still had these the only cost was the Powermat back cover and a little time.

 
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Step 1: Parts, Materials, and Tools Needed

Materials

There are only a few items needed for this project.
  1. The phone you already have.  In my case, this is an HTC EVO 4G.
  2. Palm Pre phone Touchstone phone cover.  These are easily found on Ebay
  3. Powermat Receiver door (back cover) for your phone.  These can be found on Ebay or at the Powermat web site at http://www.powermat.com.  If you buy one on Ebay, make sure that the one you get has the plug that connects the back cover to the phone charging jack.
  4. Touchstone charging base.  I have one at home, one in my car, and one at work.  These are easy to find on Ebay as well.

Tools

The tools I used on the project were as follows:
  1. Soldering iron
  2. Dremel rotary tool although a sharp knife might work for you as well.
  3. Volt Meter

NOTE: If you plan on using any tool for a project please make sure you are familiar with the tool and all of the dangers associated with it. If you are not familiar with a tool then you should ask someone who is to show you the proper way to use it. A lot of communities have classes at local colleges on the proper use of tools and machinery. There are also local woodworking clubs that offer classes at very reasonable rates for beginners. I highly recommend using these resources for your safety and for the most efficient use of the tool.

SAFETY FIRST
Always wear eye and hearing protection.
Always work safe with the proper safety equipment and guards on your tools.

tbayart2 years ago
Why don't you keep the inductance coil of the powermate ?
stevemoseley (author)  tbayart2 years ago
I tried the powermat back with the touchstone base and could not get any voltage out of it so I just replace it. I hoped it would be that simple, but it wasn't.
Ok so using the powermat induction charger with the Palm coil may not work.
stevemoseley (author)  tbayart2 years ago
Correct. I don't think it will.
ledsign2 years ago
It's useful!