This radiator temperature indicator can be designed using electronic
circuit diagram bellow .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 not
exceeding 50 ° C, thermal indicator will flash a green LED, one orange
will be provided for temperatures of 50 ... 75 ° C and a red LED, for
temperatures above 75 ° C.
Simple Radiator Temperature Iindicator Circuit Diagram
Simple Radiator Temperature Iindicator Circuit Diagram
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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