You will need just a few things to build this device.
- 1 battery for your camera. search on ebay or amazon and buy the cheapest one you can find, it doesn't have to work well it just needs to fit in your camera.
-2 DC to DC step down. Ebay again, just a few dollars. I used this one. http://www.ebay.com/itm/250954119681?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2649
-3 Small enclosure for the step down.
-4 One DC power jack
-5 One DC barrel plug
-6 12" of 1 pair wire or a couple strands of hook up wire.
-7 Shrink tube
Multimeter <------ THIS IS A MUST!