> Anyway, if the motor datasheet has nothing about motor > PWM-ing: do not PWM it. This is silly. Few motor data sheets specifically mention PWM, but high speed switching is a valid way to drive a motor with good efficiency. It works because of the inherent physics of the motor, not because the motor is "rated" for it. ***************************************************************** Embed Inc, embedded system specialists in Littleton Massachusetts (978) 742-9014, http://www.embedinc.com -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu