PWM Throttle circuit board


I just got my new pwm throttle boards.

pwm.jpg
 
It powers the trains (DC). It uses Pulse Width Modulation and has a very smooth speed transition from 0 -100%. PWM keeps the motors cooler and also gives a much smoother speed control over the engines in both directions.
 
So where can I find out more about this ?
I am looking for a "good" throttle for HO DC using a combination of can and older open frame motors, mostly steam.
Thanks T.C.
 



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