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Radiator Temperature Indicator(1N4007)

2017-08-06 17:38  
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This article describes the Radiator Temperature Indicator (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.

This radiator temperature indicator can be designed using electronic circuit diagram below. Temperature indicator consists of two special zener diode, D1 and D2, connected in series to ensure accuracy of 5.96 V Zener voltage at 25 ° C. As long as the radiator temperature does not exceed 50 ° C, thermal indicator will flash a greenLED, one orange will be provided for temperatures of 50 … 75 ° C and a redLED, for temperatures above 75 ° C.


Figure 1 

Zener voltage will increase by 20 mV for each temperature increase of a degree Celsius temperature. Radiator temperature corresponding voltage level is compared with two reference voltages, IC1 and IC2 using. When the temperature reaches 50 ° C, IC2’s output goes to logic state “1” so that T3 leads and following ignition with diode D4. At 75 ° C, IC1’s output is in logic state “1” and, therefore, T2 and T3 will, so that D3 and D4 lights are off.



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