@jetter - this assumption is so easy to make because 99% of the time, these small units just use a real "wall-wart" switching power supply so a linear power supply upgrade would work just fine. However, when I look at possible upgrades to linear power supply I always try to examine the rear panel to see what the power requirement is. Usually it’s DC, such as 5V DC or 12VDC or something similar. In very rare cases, it is actually a, AC input (which can use the same barrel plug connector as other DC power supplies). If there's no print on the rear indicating power supply requirements, then I need to pull out my multi-meter to see what the power adapter is really producing.