The Elenco XP-100 single-output battery eliminator and DC power supply provides a constant source of DC voltage and current for powering and testing electronic devices. It can be used in place of most batteries, including AA, AAA, C, D, and 9-volt types. The power supply unit (PSU) has one output that supplies a fixed voltage of 1.5V, 2.2V, 3V, 4.5V, 5V, 6V, 7.2V, 9V, 10V, 12V, 13.8V, or 15VDC and current up to 1 amp. An integrated circuit (IC) holds output voltage within 0.2V when going from no load to a 1-amp load, and the output voltage will not increase while the output voltage settings are being adjusted. The PSU accepts an input voltage of 120V AC at 60 Hz, and a 2-amp fuse and thermal cutoff circuit help protect against short-circuits and overload.