This MFJ-4103 Miniature Switching Power Supply can deliver up to 40 Watts (13.8 VDC at 2.89 Amps) of reliable power . Its an incredibly tiny 4 1/8 x 2 5/8 x 1 3/8 inches and weighs just 10 ounces including output power cord and connector. It has an output DC cable with a standard MFJ coaxial DC power connector (2.1mm ID, 5.5mm OD) that fits most MFJ and other ham accessories and QRP rigs. A sturdy adapter cable is also included for use with the Yaesu FT-817.
Its perfect for QRP rigs needing up to 2.89 Amps.
The MFJ-4103 Mini Switching Power Supply works for input voltages 100-240 VAC and power line frequencies 47-63 Hz.It is protected from overvoltage, overcurrent, and overtemperature. It has excellent 1% line and 5% load regulation and 1% peak to peak ripple and noise. Operating temperature is 0-40 degrees Celsius. Mean time between failure is 100,000 hours at full load at 25 degrees Celsius ambient. It meets FCC part 15 class B, UL 1950 and CSA 22.2