Pro/Forums - View Single Post

Gooserider · 07-29-2003, 12:40 AM

the stuff I've seen on PWM supplies suggest that the cure for noisy motors at low RPM is to stick a biggish cap across the fan leads. Apparently this acts to take the edges off the squarewave output of the PWM circuit and gives the fan something more closely approximating lower voltage DC. It might not be able to run as slowly, but it will be less noisy when it does run.

Gooserider

07-29-2003, 12:40 AM	#38
Gooserider Cooling Savant Join Date: Jun 2003 Location: North Billerica, MA, USA Posts: 451	I could be wront, but AFAIK, the stuff I've seen on PWM supplies suggest that the cure for noisy motors at low RPM is to stick a biggish cap across the fan leads. Apparently this acts to take the edges off the squarewave output of the PWM circuit and gives the fan something more closely approximating lower voltage DC. It might not be able to run as slowly, but it will be less noisy when it does run. Gooserider __________________ Designing system, will have Tyan S2468UGN Dual Athlon MOBO, SCSI HDDS, other goodies. Will run LINUX only. Want to have silent running, minimal fans, and water cooled. Probably not OC'c