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Temperature Alarm with Op-Amp Comparator (1N4007)

2016-02-21 04:26  
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This article describes the Temperature Alarm with Op-Amp Comparator (1N4007). The principle is very simple, very practical. The circuit components can help you understand better grasp this principle. For example, in this circuit, you can go to find and buy these components: 1N4007.

The circuit below is configured as a comparator. A fixed reference voltage at the non inverting input is provided by R1 and R2. The inverting input voltage is set by the other two resistor. The output goes to minus 12 volts and the buzzer is energized if the voltage at the inverting input rises above the reference voltage.

THE OPAMP AS A TEMPERATURE ALARM 1 circuit schematic diagram

By swapping the preset and temperature dependent resistors, we can change the behaviour of the circuit. The temperature dependent one can be replaced by light dependent resistors.


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