Hey everyone, I know this topic comes out every so often. Just wanted to ask if I am doing the right thing, in order to avoid overheating the board and the transistors.
I am running two Fans off my Arduino Mega, they are DC12v 0.14A each. I am using two IRF 530 transistors to drive them, I have put a diode between each transistor's drain and the positive to the Vin of the board. The board is powered through a 12V adapter, I am not trying to control the speed, just simple on and off. At some point I thought about using a resistor between the transistor's source and the ground of the board, but I have noticed that the fans would stop working. I tried 10k Ohm and 1k ohm, they just wouldn't work. Can I run them without using any resistors or would I risk overheating the circuit? The whole thing will be housed in a carton box, that's why I am trying not to overheat anything. Also, the fans go on every 7 seconds for 3 seconds then off.
Many thanks for your help