If I put my fans to my 633 there is a noise.
It is caused by the PWM signal (like also said in the manual).
I tried several fans. All made this noise except a YS-Tech TMD-fan. The reason is that the TMD has the motor not in middle it is in the frame. Therefor it has a big mass and doesn't loose much speed then the power is off for a little time (in each PWM-cycle).
I thougt it would be possible to put a capacitor (e.g. 100...1000 µF) parallel to the fan to have a ripple rejection.
My question is:
Would it be dangerous for the 633?
Speed reporting is not so important. It would be only important for me to control the speed of the case fans.
It is caused by the PWM signal (like also said in the manual).
I tried several fans. All made this noise except a YS-Tech TMD-fan. The reason is that the TMD has the motor not in middle it is in the frame. Therefor it has a big mass and doesn't loose much speed then the power is off for a little time (in each PWM-cycle).
I thougt it would be possible to put a capacitor (e.g. 100...1000 µF) parallel to the fan to have a ripple rejection.
My question is:
Would it be dangerous for the 633?
Speed reporting is not so important. It would be only important for me to control the speed of the case fans.
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