The 12V Dimmer Kit V2 by Dale Wheat is an efficient PWM contoller/dimmer for dimming LEDs or slowing Motors down manually up to 60W!
This kit meets a need that is often overlooked, a simple board that can deliver a variable signal and handle high power load. It’s an especially efficient PWM (pulse-width modulation) controller for 12V loads up to 60W. Use it to variably dim high power LEDs or control the speed of DC motors. It comes as a kit that you solder together yourself, and it will work with either the dial adjustment (a potentiometer), or the push button – or both.
Dale added an extra amplifier stage to the output driver, and was able to get the kit to handle up to 60W without a heat sink on the output transistor. It gets a little warm but not much (i.e., you can leave your finger on it). All-in-all this is a simple, handy, and robust little board that it very multi-purpose!