Hi everyone,
Today I received the XBoard Relay (RB-Dfr-216) and I noticed that after 5-10mins of being powered by an 9V power adapter, the board gets very very hot. There is absolutely nothing connected to it yet, except for the power adapter. It gets so hot, that you cannot keep the tip of your finger underneath the board for more than 3-5 seconds.
It also gets hot when it is connected to the laptop via the usb cable, but it doesn't get as hot as when it is connected to the power adapter. I guess the voltage level makes a different (usb 5v vs the 9v adapter) so I guess it will get even hotter when it is powered by the suggested 12V adapter.
Is this normal or I just got a defective board.
I'm really concerned that this can be a fire safety issue for my project so any comment or suggestion will be appreciated.