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A temperature controller for crystal growth experiments of long duration

L Godfrey and J Philip

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DESIGN NOTE

A simple low-cost proportional temperature controller is described that can be used to maintain a constant temperature in a bath over a period of several weeks. The emitter-base junction of a silicon transistor is used to sense the temperature and a switch mode power control is used in the output. The observed temperature variation is less than +or-0.05 K at 320 K. The system is protected against power failures by a battery backup and is ideally useful for crystal growth from solution of long duration.


PACS

81.10.Dn Growth from solutions

85.30.-z Semiconductor devices

Subjects

Electronics and devices

Semiconductors

Condensed matter: structural, mechanical & thermal

Dates

Issue 7 (July 1989)



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