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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