Hello Everyone, I consider myself only a novice when it comes to electronics... I can dissect most consumer electronics and figure out how they work; however I am having issues getting over the learning curve when it comes to designing things. My scenario is simple: I am using pulse width modulation to control a 12V/2.5A motor from a transistor. The transistor will turn the motor on and off as well as adjust speed based on the pulse. I need it to be able to be controlled from my microcontroller(thus, 10ma on the base.) For the life of me though, I can not find out how to select a transistor. There are so many different variations.... none of which allow 2.5A to be controlled by 10ma. How do professionals go about designing circuits and picking parts? Thank you for your time.