[...]
> I'm a bit disappointed with its performance -- [...] the power
> supply is the source of a surprising amount of noise and vibration.
I fixed the vibration problem. I replaced the Nidec fans in the 3Y
PS with a pair of Sunon "MagLev" fans. Sunon's advertising seems to
have some substance -- their balance is significantly better. The
thing still whines like, well, a couple 10,000RPM fans, but it
doesn't try to walk the table around the room. The old ones vibrated
badly enough to create a buzz in the chassis -- it wasn't the handle,
so I think they worked the power supply itself loose enough to buzz.
We'll see if the quiet lasts.
The Nidecs have a locked rotor alarm rather than a tach output, so
I ended up cheesily defeating them with a 100 Ohm resistor to ground
(about .6mA flows through it). Two fan failures are the least of my
worries, and if I'd designed the thing I'd've used a real fan
controller with tach and temp inputs.
[...]
Peter E. Fry
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