40mm fan with sensor?

[William P.N. Smith]

I'm trying to replace http://compusmiths.com/40mmFan.jpg with
something quieter (and probably slower), and probably with ball
bearings. Note that in this application it must have the fan sensor
(3-lead fan) so the alarm will not go off...

I've found
http://www.cablesunlimited.com/products/Prod_Individual3.aspx?groupcode=I3391
and
http://www.cyberguys.com/templates/searchdetail.asp?T1=148+0119&dept=lch9&search=&child=
but I'm not sure what their quality is like.

Anyone have any suggestions for good quality fan vendors? The
original one is 10mm thick, but there's plenty of room for a thicker
one.

Thanks!

 

[[email protected]]

I'm trying to replace http://compusmiths.com/40mmFan.jpg with
something quieter (and probably slower), and probably with ball
bearings.

Digi-Key sells nearly the same fan (Sunon KDE1204PFB1 MS.M) and claims
31 dBA. Most of the other 40 mm fans they sell have a similar sound
rating.

Note that in this application it must have the fan sensor (3-lead fan)
so the alarm will not go off...

I thought these sensors were usually a tachometer with so many pulses
per revolution - you can tell that the fan is turning at X rpm. It
seems there are some that are just a rotation sensor switch - fan is
turning or not. If the device this fan is used with can report fan rpm,
it's probably the former, but if all it knows is "fan fail", it could be
the latter.

Anyone have any suggestions for good quality fan vendors?

Digi-Key sells Panasonic and Comair/Rotron fans, and Mouser sells
EBM-Papst fans. All of these are probably more "well known" names
than Sunon.

Note that fans from these sources will probably come with just lead
wires; you'll need to cut the connector off of your old fan and splice
it on to the new one.

Matt Roberds