I have a 37v LED panel and a IRF540n transistor. I want to use the transistor as a switch, but I don't want to burn down my Arduino. I have a few questions I can't seem to figure out the answer to.
Do I need to put a resistor between the Arduino and the gate of the transistor? If so, is it because in order to protect Arduino from short circuits, but normally it doesn't need to be there? doesn't the gate only 'give out' electricity?
How to know how big of a resistor to put between the gate and Arduino? does it depend on the other device's power or there's just a general resistor I can use in all cases regardless if I power 10v device or 40v device?
The LED panel doesn't have the 'shell', where do I put the ground wire coming from Arduino to?
Thank you for your time.