Hi Doc -
I looked at the fans you referenced below. They mention "PWM" (Pulse
Width Modulation) which is a way to control fan speed by the 'duty
cycle' of the applied AC. It says there is "a PWM 'amplifier'" in the
fan, which should be silent, but I wonder if there are other associated
electronics in there which might generate RFI? I assume you haven't
experienced any problem, but I wonder if you have ever probed or
listened for RFI when they are in operation?
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 4-B, C-Line& TR-4/C Service Supplement CDs
<www.k4oah.com>
halo.net wrote:
Very cool discussion for Drake fans.. I glued a couple of very quiet
Arctic F12 120mm together, wired in series to an old surplus wall wart
and use them on top of all my vintage valve equipment. They're cheap,
quiet, have fluid dynamic bearings for longevity and can be flipped
over for suck or blow... you can pick them up on Ebay for $8.80 a
piece shipped..
http://cgi.ebay.com/NEW-ARCTIC-COOLING-Arctic-F12-PWM-120-mm-120mm-Case-Fan-/380237785094?cmd=ViewItem&pt=LH_DefaultDomain_0&hash=item5887f02806
<http://cgi.ebay.com/NEW-ARCTIC-COOLING-Arctic-F12-PWM-120-mm-120mm-Case-Fan-/380237785094?cmd=ViewItem&pt=LH_DefaultDomain_0&hash=item5887f02806>
Doc
Halo.net: http://mysite.verizon.net/halo.net/
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