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Re: [Amps] Cooling 77SX

Subject: Re: [Amps] Cooling 77SX
From: Don Moman VE6JY <>
Date: Fri, 6 May 2016 21:10:43 +0000
List-post: <">> temperature switches come in various
degrees, I use them in power supply fans etc. Small and cheap.

73 Don

On Fri, May 6, 2016 at 6:38 PM, Gary Smith <> wrote:

> As it sits now, the fan is always on at
> the maximum amount and other than when I'm
> on RTTY, the air temp from the exhaust
> rarely gets over 110 degrees.
> The fan is noisy from the air turbulence,
> the motor/bearings are as new. I would
> like to reduce the fan to a low speed and
> kick in at a higher temperature. What
> would be ideal would be for the fan to
> progressively increase the RPM to match
> the cooling need and increase as the
> temperature increases.
> Perhaps the most reasonable solution would
> be to have the fan run at a minimum speed,
> place a thermostat with probe in line and
> have it kick in at one specific temp and
> give full RPM at that point but I would
> prefer a progressive speed:temp solution.
> I've also thought another option might be
> to remove the fan & disconnecting the
> power to the motor, connecting a 20' long
> 6" duct to the exhaust vent and at the
> distal end of the duct, have an in-line
> fan.
> I can't visualize how to make a
> progressive speed solution and I'm not
> sure of a cost effective thermostat that
> would be small enough to be internal to
> the amp.
> Any suggestions, thoughts? I really would
> like to keep the fan noise down in this
> otherwise silent shack.
> 73,
> Gary
> KA1J
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