I've decided to use a switching 5v 1A power supply which recharges my USB devices. The unloaded output voltage is 4.94v. The original power pack contained a huge and heavy transformer so the power supply ran fairly hot.
So far, the DR111 seems to running alright and the USB charger isn't abnormally warm.
Last edited by tpreitzel : 07-11-2013 at 08:04.