Is anyone familiar with a small heater ( dime or quarter size ) that will heat to a set point and then hold that temp without a thermostat. I had some samples of them a few years back but can't remember the company that made them or what they were called.
Terry
Google PTC heater (Positive Temperature Coefficient)
I thought Raychem made such a thing, but I couldn't find it. Maybe they did before the Tyco overlords took over...
Search for 'heat trace'; these are self regulating heating elements, usually in the form of a 2 core cable, used to protect water pipes from frost. Martin
Terry,
I developed the polymer ptc heater used in auto side mirror defrostng heaters. There are some patent references in my engineering link below. (click links)
I think what you are refering to though is a ceramic device commomnly used for motor overtemp protection and tv crt degaussing. It is about the size of a quarter... and costs about a quarter in large quantities. MuRata makes a lot of them.
Les Watts
way cool thing and with your name too!
Gunner
"This device is provided without warranty of any kind as to reliability, accuracy, existence or otherwise or fitness for any particular purpose and Bioalchemic Products specifically does not warrant, guarantee, imply or make any representations as to its merchantability for any particular purpose and furthermore shall have no liability for or responsibility to you or any other person, entity or deity with respect to any loss or damage whatsoever caused by this device or object or by any attempts to destroy it by hammering it against a wall or dropping it into a deep well or any other means whatsoever and moreover asserts that you indicate your acceptance of this agreement or any other agreement that may he substituted at any time by coming within five miles of the product or observing it through large telescopes or by any other means because you are such an easily cowed moron who will happily accept arrogant and unilateral conditions on a piece of highly priced garbage that you would not dream of accepting on a bag of dog biscuits and is used solely at your own risk.'
How about Minco?
Jon
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