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Brians256 · 01-30-2008, 05:54 AM

In order to change the speed controller, I think you'd need to replace that whole PCB. It doesn't look to be a simple job. The fix for the motor whine was, I believe, a change from a square wave pulse to the electromagnets to more of a sine wave. Laing probably just put a low-pass filter (LC perhaps?) onto the signal to the driver FETs.

01-30-2008, 05:54 AM	#6
Brians256 Pro/Staff Join Date: Oct 2001 Location: Klamath Falls, OR Posts: 1,439	Re: Worlds most powerful D5/655 pump In order to change the speed controller, I think you'd need to replace that whole PCB. It doesn't look to be a simple job. The fix for the motor whine was, I believe, a change from a square wave pulse to the electromagnets to more of a sine wave. Laing probably just put a low-pass filter (LC perhaps?) onto the signal to the driver FETs.