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From: bill@thd.tv.tek.com (William K. McFadden)
Newsgroups: sci.electronics
Subject: Re: Temperature Probes
Message-ID: <9247@sail.LABS.TEK.COM>
Date: 2 Apr 91 06:28:09 GMT
References: <1991Apr1.130656.29392@kuhub.cc.ukans.edu>
Sender: root@sail.LABS.TEK.COM
Organization: Tektronix TV Products
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Analog Devices and National Semiconductor make some common ones.  My
favorites are the three terminal TO-92 sensors from National that
output directly in degrees F or degrees C (10 mV per C or F, depending
on the part number) with no external components other than a power
source.  Add a component or two, and they can also measure negative
temperatures.

I've been able to buy the cheapest grade of Fahrenheit sensor from
Digi-Key for $2.  Add an 8-pin V to F converter (e.g., LM331), and
you've got a dirt cheap temperature to frequency converter that's ready
to connect to an interrupt line or counter input of a microcontroller.
-- 
Bill McFadden    Tektronix, Inc.  P.O. Box 500  MS 58-639  Beaverton, OR  97077
bill@videovax.tv.tek.com,     {hplabs,uw-beaver,decvax}!tektronix!videovax!bill
Phone: (503) 627-6920                 "SCUD: Shoots Crooked, Usually Destroyed"