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Finally got mine working - I was trying to do it un-soldered (since I've never really soldered before), but I finally broke down and broke out the soldering gun. Here's a few things that I have discovered:
1 - The best wire I have found is a single copper wire from telephone strand. I tried using the wire from an old pair of earbuds, but those are woven strands and for some reason wouldn't carry the current (5.5). The only thing that worked for me was the bigger single strand.
2 - If possible, solder the wire to the coil leads BEFORE attaching it to the back of your S3. The reason for this is that you need a lot of heat to get a good connection, and it started to warp/melt my S3 back. I caught it in time, but that could have been a problem!
3 - I did not solder the wires to the phone connectors itself (the ones in the back), because I want to be able to get the back on and off to change SD cards, batteries, etc. I put a ball of solder on the end of the wires so that they would make a solid connection.
4 - Use some electrical tape to hold things in place - once the back is on, there shouldn't be much room to wiggle, but before I got the back on there was a lot of play and it kept making one of the solder connections to the coil come loose.
If you want pictures I could try to take some - I am just reluctant to take it apart now that I have it working!
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