http://www.controlsupply.com/itm00031.htm


DaveC wrote:

Just a simple bi-metallic would do. Need to keep a box full of electronics
warm during winter. Threshold spec can be anywhere from 30 deg - 70 deg.

Open when warm, closed when cold, of course. Current capability not
important; can use relay to handle load.

All the google results I find are all HVSC related, none helpful.

Thanks,

wrote:

}Just a simple bi-metallic would do. Need to keep a box full of electronics
}warm during winter. Threshold spec can be anywhere from 30 deg - 70 deg.
}
}Open when warm, closed when cold, of course. Current capability not
}important; can use relay to handle load.

Do you mean like a simple furnace thermostat available from any
home improvement store?

Stan.

Stan wrote:
wrote:

}Just a simple bi-metallic would do. Need to keep a box full of electronics
}warm during winter. Threshold spec can be anywhere from 30 deg - 70 deg.
}
}Open when warm, closed when cold, of course. Current capability not
}important; can use relay to handle load.

Do you mean like a simple furnace thermostat available from any
home improvement store?

Stan.

I don't know how common they are, but here in Austin, Texas we have
a couple of Habitat for Humanity stores that sell surplus/used/donated
stuff they don't need for their own construction projects. That would
probably be a great source for something like the OP is looking for.

--
The e-mail address in our reply-to line is reversed in an attempt to
minimize spam. Our true address is of the form .

On Wed, 29 Sep 2004 11:02:17 -0700, DaveC wrote:

Just a simple bi-metallic would do. Need to keep a box full of electronics
warm during winter. Threshold spec can be anywhere from 30 deg - 70 deg.

Open when warm, closed when cold, of course. Current capability not
important; can use relay to handle load.

All the google results I find are all HVSC related, none helpful.

---
http://www.ti.com/snc/about/klixon.htm

--
John Fields

On Wed, 29 Sep 2004 11:02:17 -0700, DaveC wrote:

Just a simple bi-metallic would do. Need to keep a box full of electronics
warm during winter. Threshold spec can be anywhere from 30 deg - 70 deg.

Open when warm, closed when cold, of course. Current capability not
important; can use relay to handle load.

All the google results I find are all HVSC related, none helpful.

---
Try this:

http://www.google.com/search?hl=en&i...rmostat+switch


--
John Fields

On Wed, 29 Sep 2004 11:02:17 -0700, DaveC wrote:

Just a simple bi-metallic would do. Need to keep a box full of electronics
warm during winter. Threshold spec can be anywhere from 30 deg - 70 deg.

A bimetallic strip is usually welded, but I've heard that rivets, screws, and
even some kinds of adhesive work. You might just build one from two different
metal sheets.

One supplier I googled:
http://www.ltv-copperweld.com/

Also, there was this interesting page area:
http://www.aspire.cs.uah.edu/aspire/...BMS_Model.html
http://www.aspire.cs.uah.edu/aspire/.../BMS_Home.html

Coiled bimetallic strips are compact and sensitive and used in some furnace
controls. You could consider dismantling one of those. Call a furnace repair
outfit for a "broken" one? I wonder about the automotive thermal controls used
to block or pass radiator water -- those should be dirt cheap and widely
available and you may be able to mechanically arrange to use the innards.

I also read that adding a pressed dimple into the strip produces snap action
with hysteresis. Hadn't thought of that, but it sounds intriguing to play with.
The furnace controls I've looked at use a mercury switch that tips one way or
the other on the coiled bimetallic and, because of the weight shift, they have
that hysteresis.

Best of luck,
Jon

"DaveC" wrote in message
al.net...
Just a simple bi-metallic would do. Need to keep a box full of
electronics
warm during winter. Threshold spec can be anywhere from 30 deg - 70
deg.

Open when warm, closed when cold, of course. Current capability not
important; can use relay to handle load.

All the google results I find are all HVSC related, none helpful.

Thanks,
--
Please, no "Go Google this" replies. I wouldn't
ask a question here if I hadn't done that already.

I really have no respect for someone who says that. I've googled
extensively for some sought-after advice, and someone has then given me
a google URL that I had missed altogether. And that made me go
"ah-HAH!" and from this experience I was blessed with much wisdom. So
my advice is if you want to keep on the good side of the news group
gurus, don't belittle them for any advice you might receive, no matter
how trivial. They mean to be helpful.

Buy a thermostat from Home Depot?

DaveC

"Watson A.Name - \"Watt Sun, the Dark Remover\"" wrote in message ...
"DaveC" wrote in message
al.net...
Just a simple bi-metallic would do. Need to keep a box full of
electronics
warm during winter. Threshold spec can be anywhere from 30 deg - 70
deg.

Open when warm, closed when cold, of course. Current capability not
important; can use relay to handle load.

All the google results I find are all HVSC related, none helpful.

Thanks,
--
Please, no "Go Google this" replies. I wouldn't
ask a question here if I hadn't done that already.

I really have no respect for someone who says that. I've googled
extensively for some sought-after advice, and someone has then given me







a google URL that I had missed altogether. And that made me go
"ah-HAH!" and from this experience I was blessed with much wisdom. So
my advice is if you want to keep on the good side of the news group
gurus, don't belittle them for any advice you might receive, no matter
how trivial. They mean to be helpful.

Buy a thermostat from Home Depot?

DaveC






I would use a 40W bulb in series with a simple home thermostat ($10).

Jacques

Why not go to the hardware store, and buy a simple thermostat? Connect
it through a heavy duty relay, and run whatever heating system you want.

--

Jerry G.
======

"DaveC" wrote in message
al.net...
Just a simple bi-metallic would do. Need to keep a box full of
electronics
warm during winter. Threshold spec can be anywhere from 30 deg - 70 deg.

Open when warm, closed when cold, of course. Current capability not
important; can use relay to handle load.

All the google results I find are all HVSC related, none helpful.

Thanks,
--
Please, no "Go Google this" replies. I wouldn't
ask a question here if I hadn't done that already.

DaveC

This is an invalid return address
Please reply in the news group

Digikey sells just what you want. They are made by Cantherm. Any temperature
you want in 5 degree steps.


"DaveC" wrote in message
al.net...
Just a simple bi-metallic would do. Need to keep a box full of electronics
warm during winter. Threshold spec can be anywhere from 30 deg - 70 deg.

Open when warm, closed when cold, of course. Current capability not
important; can use relay to handle load.

All the google results I find are all HVSC related, none helpful.

Thanks,
--
Please, no "Go Google this" replies. I wouldn't
ask a question here if I hadn't done that already.

DaveC

This is an invalid return address
Please reply in the news group