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[Amps] RE: Low Noise Fan

To: <amps@contesting.com>
Subject: [Amps] RE: Low Noise Fan
From: Bnovy1 at aol.com (Bnovy1@aol.com)
Date: Mon Feb 17 00:55:54 2003
In a message dated 2/16/2003 1:55:21 PM Eastern Standard Time, 
bearlabs@netzero.net writes:

> you might
> even consider changing the motor to a DC type and controlling the
> speed of the blower that way - you could even put a temperature
> sensor on the tube and increase the voltage to the motor in proportion
> to the temp... or just buy one that is designed that way, or one that
> is already dual speed, or one that uses and external motor and is
> driven via a belt and pulleys... etc...
> 
According to my own personal experience, I would avoid using DC fans if noise 
will be a concern.  I find that they produce significant noise when compared 
to AC fans.  If varying the speed electronically is of interest to you, you 
could use a zero crossing triac circuit and vary the fan speed to your 
heart's content!

Good luck,
Bernie,
WB5HBM
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