I use 24V computer type fans run at 12V.
On 17-Jul-10 15:05, [email protected] wrote:
Jim,
And fellow Drake enthusiasts, I will go downstairs later today and get the
model numbers of the fans that I use.
As a side note, I have a project in progress that will have L4/L4B/L7 power
supply fans internal to the supply, for
convenience.
Quality is indeed important as you mentioned. Both mechanically and
electrically. I have some 12vdc computer fans,
brushless style, that generate harmonics/hash up to 148 mhz! Try before you buy
if convenient.
73,
Evan, K9SQG
-----Original Message-----
From: Jim Shorney <[email protected]>
To: [email protected] <[email protected]>
Sent: Sat, Jul 17, 2010 10:55 am
Subject: Re: [Drakelist] Fan on R4B and linears
On Sat, 17 Jul 2010 09:16:50 -0500, Don Cunningham wrote:
Evan,
Would you share the make and model of the fans that work so well for you??
Sounds like something I need to do here.
Well, I'm not Evan, but I will share what I am doing with my L-4PS. The larger
the fan, the slower (and quieter) it needs to run to move a certain amount of
air. Or, the more volume it will move for a given speed. I have a pair of
ebm-papst 12 volt fans pulled from server computers, model 4412 F / 2M. They
are about 4.75 inches (120mm) in size, and I run the two in series from a 12
volt power source, pulling air OUT on top of the PS. They seem to work very
well, and I can't hear them running when I am sitting practically right on top
of the PS. I have to check with my hand to feel the air to make sure they are
running. They can be "mounted" as Evan describes, or some thin stick-on weather
stripping material can be cut into small strips and affixed to the fans. I
currently have mine just sitting there with nothing between the fan and the PS,
they are so lightweight and made of plastic that they don't scuff.
What is probably more important here than the type of fan is the quality. Avoid
cheap sleeve-bearing PC fans like the plague, they will die on you. Guaranteed.
The ebm-papst seem to be a decent product. Panasonic Panaflo fans are
excellent, they seem to go forever. Be cautious of PC fans labeled as "ball
bearing", some of the small ones that I have taken apart have a ball bearing at
one end of the impeller shaft, and a sleeve bearing at the other. I don't see
this as an improvement. The new Sunon "Maglev" design looks interesting and
seems to have better longevity, but they haven't been around long enough to
make an accurate judgement.
And remember to clean the blades once in a while, a little dust can reduce the
airflow by a surprising amount.
I'm sure Evan will have some great recommendations as well!
73
-Jim
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