Don,
Those might be useful. I'm thinking normally closed might be more
useful. I'll look and see what I can find.
Thanks for pointing these out.
73,
Gary
KA1J
> http://www.ebay.ca/itm/172168102732 temperature switches come in various
> degrees, I use them in power supply fans etc. Small and cheap.
>
> 73 Don
> VE6JY
>
> On Fri, May 6, 2016 at 6:38 PM, Gary Smith <Gary@ka1j.com> 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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> >
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