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Circuit Diagram of Simple Zero Degree Celcius (AD1674JN)

2015-01-09 06:55  
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This article describes the Circuit Diagram of Simple Zero Degree Celcius (AD1674JN). The content is very simple, very helpful. Components in this article can help you understand better understanding of this article. For example, in this article, you can go to find and buy these components:AD1674JN.

Basically, this zero degree Celsius detector used a thermistor to sense the temperature. This circuit used a buzzer that will produce an alarm whenever the temperature falls below zero degree. An Opamp (LM7215) used to compare the reference voltage with the voltage from the thermistor. Pin 3 is a non inverting input from the reference voltage and pin 4 is an inverting input from the thermistor. When temperature become less than zero degree, the non inverting input become larger than the voltage at the inverting input, and the opamp output become high. This makes transistor Q1 ON and drives the buzzer to make alarm.zero-degree-celcius-detector-300x194

 


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