According to this site: http://www.rason.org/Projects/regulator/regulator.htm you can get 12v from a 7805 (which normally outputs 5v). I have tried this circuit with a 7.4v battery and a 12v battery, and I just get 5v still. In other words, it doesn't seem to work. Ideas? I just want a simple low amperage (500mA max) step-up regulator. I am ideally wanting to get 12v out of a 7.4v battery, other ideas?