Hi. I have a 5 meters 5050 led strip with 300 led. That 5 meters will use about 72,5W and I want to connect it to arduino leonardo board. I have a 12V 10A power supply but I dont know which transistor and capacitor should I use?
I would suggest an N-channel MOSFET with a logic level gate such as stp16nf06l for example. For the cap, perhaps a 1000uF electrolytic with a voltage of at least 18V.
Have a look at this:- Usage | RGB LED Strips | Adafruit Learning System