cant a simple pwm be built using a 555 timer and a mosfet? I was experimenting last year with this but ended up buying a chinese one. I am not happy with it. I feel it holds back too much even when it was se to wide open. I am going to start playing around again now that it is getting warmer. I believe there are people out there that know a lot more about this and it would be great if we could get their input. I havent seen much on this here so far but will continue looking.I am sorry if I missed any info on this .