>I guess there should be more simple tecnique to control AC fan. >Original manufacturers they using resistor in series I think >(what else they can switch inside of cheap Holmes fan ? ) >Actually I didn't open a unit yet to prove that. They have a tapped coil in the motor winding. The switch changes to the other tap. hope this helps, Peter -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu