Newbie level 1
I need some advice in designing a simple brushless DC motor speed control for a 12V 1-amp fan that is not available wired for PWM control. I want to buy components and assemble my own, as opposed to buying something off the shelf. I know just enough to be dangerous - that voltage control by potentiometer is energy wasteful, which is problematic, since this will be running on battery power only and battery life is a big issue. Is potentiometer currency control better? Are there other efficient and inexpensive options? Thanks for any advice you can offer.