Is it fan noise or do you possibly need some type of suspension rubber mount
for the fan? If it's the mounting transmitting noise to the chassis you might
be able to solve that without going to the temperature controller.
On temp sensor, you can use a thermocouple something like this
http://www.omega.com/pptst/SA2.html of course then you have to build or buy a
controller like http://www.ebay.com/itm/like/360528140778?lpid=82 there are a
lot and other than finding a place to mount the controller it would take care
of it all in one device and you would not have to build/calibrate one.
73 - Dave N8ZFM
-----Original Message-----
From: Amps [mailto:amps-bounces@contesting.com] On Behalf Of Vic K2VCO
Sent: Thursday, November 21, 2013 11:33 AM
To: Amps reflector
Subject: [Amps] Fan sounds like F-15
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.
--
Vic, K2VCO
Fresno CA
[2]http://www.qsl.net/k2vco/
References
1. http://www.qsl.net/k2vco/4CX1000A/Underside.jpg
2. http://www.qsl.net/k2vco/
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