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Dave · 03-19-2005, 09:08 AM

I do not know anything about the DDC circuit, but making the MAG circuit PWM and fan controller safe was my duty.

You must design the system so that the control components are not effected by the pulsing, well shunting across the coils. This will allow the brushless motor to operate at lower frequencies. You can also solve this problem with a simple DC convertor circuit (a cap and resistor) in your power supply.

I found most power supplies very steady, well fan controllers are not.
Most fan controllers I tested where very cheaply built and likely not to last.

I can not give details on the bad fan controller units because of my job, but I am sure most in here can judge themselves.

03-19-2005, 09:08 AM	#275
Dave Cooling Savant Join Date: Oct 2004 Location: Canada Posts: 260	I do not know anything about the DDC circuit, but making the MAG circuit PWM and fan controller safe was my duty. You must design the system so that the control components are not effected by the pulsing, well shunting across the coils. This will allow the brushless motor to operate at lower frequencies. You can also solve this problem with a simple DC convertor circuit (a cap and resistor) in your power supply. I found most power supplies very steady, well fan controllers are not. Most fan controllers I tested where very cheaply built and likely not to last. I can not give details on the bad fan controller units because of my job, but I am sure most in here can judge themselves.