Simple, inexpensive circuit has been developed which provides active temperature control to certain precision electronic components such as crystal oscillators and Zener diodes

Billingsley, S. W.

English

NASA Technical Reports Server

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Exact Tern 
Bridge Resistors 
Are Metal Film Qi MP6531 
February 1973	 B73-10052 
NASA TECH BRIEF 
Goddard Space Flight Center 
NASA Tech Briefs announce new technology derived from the U.S. space program. They are issued to encourage 
commercial application. Tech Briefs are available on a subscription basis from the National Technical Information 
Service, Springfield, Virginia 22151. Requests for individual copies or questions relating to the Tech Brief program may 
be directed to the Technology Utilization Office, NASA, Code KT, Washington, D.C. 20546. 
Oven Temperature Controller for Electronic Components 
Note: 
All resistance values are in ohms. 
The problem: 
In applications where ambient temperatures vary 
widely, certain precision electronic components such 
as crystal oscillators and zener diodes require active 
temperature control. 
The solution: 
A simple, inexpensive circuit has been developed 
which provides this temperature control. 
How it's done: 
The circuit, shown in the figure, will control the 
temperature of an oven within ± 10 C when the ambient 
temperature ranges from 500 C up to the oven temper-
ature. In addition, if resistor R2 is selected to provide 
adequate drive to transistor Q1, the input voltage can 
vary from 10 to 37 V. Because transistor Q1 is 
saturated when it conducts, no heat sink is required. 
This document was prepared under the sponsorship of the National 
Aeronautics and Space Administration. Neither the United States 
Government nor any person acting on behalf of the United States
Resistor R 1 sets the trip-point hysteresis at 2° C with 
the circuit values shown. If the heater current is less 
than 150 mA, it can be supplied directly from the 
pA723 integrated circuit by connecting the element 
between pin 6 and common. 
Note: 
Requests for further information may be directed to: 
Technology Utilization Officer 
Goddard Space Flight Center 
Code 207.1 
Greenbelt, Maryland 20771 
Reference: B73-10052 
Patent status: 
NASA has decided not to apply for a patent. 
• Source: S. W. Billingsley

Goddard Space Flight Center

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Government assumes any liability resulting from the use of the 
information contained in this document, or warrants that such use 
will be free from privately owned rights.
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Oven temperature controller for electronic components

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