Audio Visual Thermometer (CB18469E)

Details
Written by: Newton C. Braga

 

This circuit was found in a 1974 publication. It provides a tone indication of the temperature sensed by an NTC. The circuit is powered by 9 V and the scale adjustment is done in a pot or trimpot. The NPN transistors can be the BC548 and PNP the BC558.

 


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