For a project I want to power a fan using Arduino. The power for the fan comes from a external adapter with the following specifications:
AC/DC switching adaptor
output: 9v , 4.45A , 40W max
I think this problem is solvable with a DigitalOut pin and a transistor. The problem is that I do not know what type of transistor and what it's capacity (?) should be. Can someone help me out with this?