I've got a a small wireless camera that runs off a 9 v battery, or 8 v wallwart. I also have several USB chargers (built in rechargeable batteries). Unfortunately, 5 volts isn't enough to run the camera, a 9 v battery doesn't last long, and a wallwart kind of defeats the 'Wireless' aspect. Looking for a simple method of boosting the USB 5volts up to 8 volts, any ideas?