Re: laptop heater

On 1 Jan 2007 08:34:13 -0800, "george" <gjdbxxxx@xxxxxxxxx> wrote:

Two problems. I have attempted to find thermostat switches between 60
and 80 deg F with no luck. Do they just not make them? Also I am
being buried in information about heaters. Can someone provide a
recommendation about a flat heater(1 or 2 inches thick) that I can use?
Preferably surplus.

Check out pet stores or agricultural supply places for heaters - they
make indoor/outdoor fiberglass enclosed pads for warming animals with
built in thermostats. Dogs Cats Hogs, etc..

Likewise pet stores for terrarium heaters - indoor thingee that goes
under the terrarium - usually no real thermostat but might have
different power settings.

Thermostats are readily available through surplus outlets - easy to
build from scratch too.

Hardware stores sell electric thermostats for electric baseboard
heating. Designed to go in a standard switch box and with a positive
action switch designed to switch 20 amps at 240 volts. Temperature
range on the dial of the ones I have is 50-90 (F) but the actual knob
travel is more like 30-100 (F). That, an insulated box and light bulb
.. .. .

The lower temp limit is usually because the lubricant in the hard
drive can thicken and cause the platter to spin up slowly causing a
head crash on boot up - worst case. Once running and warm it may be
safe enough in a cold room as long as the drive stays up. Other
downside is some liquid crystal displays are sluggish at low temps.
Cold cathode fluorescent lamps may not fire cold - but not
catastrophic failures as a rule.


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