Hi i am new to the forum and would like some help with a project i am trying to build , I have four high power led s that i want to run from a 12v battrey however the leds have a forward voltage of 3.5v max at 1000ma , i would like to run them in strings of two connected in seires which means using a buck converter to step the voltage down also i would like to be able to dimm the whole setup using pwm 0% to 100% which i have already built my problem is that i have no idea which buck regulator to use and even less of an idea how to put pwm into a buck regulator or what components to use with the buck regulator to get the best from my power supply any help would be welcome