Hey guys, first time poster here! I have really loved reading all sorts of threads here, as I really love my music and the quality from my Q701's and even my 240II's by AKG. I really love the community so I figured I give back a bit for all the boredom that has been cured and spent well on the forums. So on to the guide.
It's a modified version of http://www.maximumpc.com/article/features/get_your_hack_on?page=0,1 , so credit to them for most of the guide!
You can use this charger to charge most USB charged items, such as COWONS, IPODS, IPHONES, AMPS, IPADS, PHONES, etc. Haven't tried with camera's yet but I assume it will work.
You will need: All This can be bought at a local Radioshack or similar store
1 - USB A Female connector. This can be salvaged from any USB extender, or old computer. I salvaged mine from an xbox so there ya go :)
2 - Soldering Iron, Solder, and Insulated Wire. These are the Solder basics, if you don't know how to solder,google a tutorial or two, it's pretty easy, and it's fun, and it's a good thing to know how to do.
3 - Housing for the Unit. I used an ALTOIDS tin, but anything of that general size will work.
4 - Tool to cut housing. I use a DREMEL, which i used the cutoff wheel. It makes the hole a bit too big but I don't mind, mines a bit messy, and i'm fine with that.
5 - 2 Pin Switch or NON-MOMMENTARY Button. This means it clicks into the on position, so you don't have to hold the button down to charge.
6 - +5v Regulator. This takes away 4v of the 9v current from the battery, so your electronics don't fry :), you're welcome lol
7 - 9v Battery Holder. Preferably just the end snaps, not full plastic holder. Ones similar to mine are prefered.
8 - 9v Batteries. To power it.
9 - Hot Glue Gun & Glue
Strip away all the wires from your connector, if you salvaged it, so you can only see the 4 pins on the back, no wires coming off.
Cut and strip 4 wire pieces that you feel will fit nicely in your container, but not too small where you can't open it all the way. I prefer longer wires to be safe, which is a bit annoying to deal with at the end putting into the case but it's worth it in my opinion. Also, cut and strip 1 SMALL piece, about 1" in length.
take a sharpie, or another method of marking, and mark the USB Connector as follows: Hold the connector facing you so that the black bar is on top, and you are looking into where you would plug your usb cable into. mark the LEFT side, anywhere, so you can see it.
Mark the +5v Regular in this way: Hold the regulator so the pins go to the right, and the metal piece is on the bottom. Mark the bottom pin.
Drill a hole in the top of your container, and insert your button/switch into it. Glue if neccessary. Make sure it is stable. DO NOT GLUE OVER THE PINS.
Cut a hole in the side of your container, try to make it similar in size to the USB A Female Connector. DO NOT MAKE IT TO BIG. You can make up for it being a little too big, but try not to go too overboard, as it will look bad.
Solder the RED (+) wire from the Battery Holder to either of the pins on your switch. This is so the switch can be used to allow/disallow the current from the battery (Turn it off).
Solder a wire from the unused (other) pin on the switch to the MARKED pin on the +5v Regulator.
Solder a wire from the farthest pin from the marked side on your USB Connector to the middle pin on the +5v Regulator.
Solder the BLACK wire from the Battery Holder to the middle pin on the +5v Regulator. You should have 2 wires soldered to the same pin.
Solder a wire from the closest pin to the MARKED side on the USB Connector to the farthest from marked pin on the Regulator (The unused pin).
Solder the small wire from one of the middle pins on the USB Connector, to the other middle pin. This shorts out the Data in/out lines, and allows the device to use your charger as a Dedicated Charging Port. This allows it to charge ipads, phones, and other devices that require more power.
The electronic component is now DONE! You can use the switch to control if the charger is on or off. Test it to make sure it works.
Hot glue over the pins on the Regulator, USB Connector, to make sure they don't come undone.
Glue in your USB Connector to fit it into the hole you cut before. Make sure you can plug something in through the hole by testing it. I advise doing this by glueing from the front first, since you can see where the port looks best, and then glueing the back, and peeling the glue off the front afterwards.
Glue in the +5v Regulator. This just makes it more sturdy and less homemade feeling.
Put the whole thing in your case, put the battery in, and you're done! Enjoy your new charger! Hope this helped a few of you :).
Wouldn't let me insert pics ATM, will edit in a second, for now, links to the images on my server I guess.