On 11/21/13 11:32, Vic K2VCO wrote:
I've been using my new 4CX1000A amplifier for a few days. It works great.
But there is one problem that I need to solve: the fan -- it's a flat
centrifugal type -- here's a construction photo from my website:
[1]<http://www.qsl.net/k2vco/4CX1000A/Underside.jpg>
which provides somewhat more air than is needed. But it also provides more
noise than is needed, somewhat like an F-15 pilot kicking on his
afterburner. OK, a little exaggeration. But not much.
I would like to implement a thermostatic control system. I envision a sensor
stuck in the chimney above the tube that would operate a relay to switch the
fan from low to high speed.
Has anyone done this? What kind of sensor should I look for? What
temperature should it switch at? The fan is an AC motor with a capacitor
across half of the field -- is it safe to reduce speed by putting a resistor
in series with the motor?
I know a simple solution would be to remote the fan, but it would mean
building a new amplifier! And good noise-cancelling phones cost $300.
Block off half or three quarters of the blowers air intake to unload
the motor.
--
Ron KA4INM - Youvan's corollary:
Every action results in unwanted side effects.
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