High temperature indicator circuit
In some areas there is a need of
temperature detectors which help them to detect temperature and indicate
them whether the temperature is low or not.
Below shown circuit is the simple
high temperature indicator circuit. It will not show the current temperature
but if it exceeds some threshold temperature it will detect and indicate. You
can use this circuit anywhere you needed.
The components needed for the
circuit are:
- 3 Resistors
- 1 Temperature dependent resistor
- 5v battery
- Two 1n4007 diodes
- One Op-Amp
- One LED
And the circuit working is actually
very simple, the Op-amp is connected as Non-inverting comparator. And a bridge
circuit is made with the resistors and a Temperature Dependent Resistor. From
above circuit R1, R2 and R3 are normal resistors but RT is Temperature
Dependent Resistor.
The bridge resistance and RT are
selected in such a way that as long as temperature is less than threshold
value, the bridge is unbalanced by making Voltage at B more than voltage at A .
Hence Vo = -Vsat and LED is reverse biased and remains OFF. When temperature
becomes more than threshold then Voltage at B becomes less that Voltage at A
hence it drives Vo = +Vsat. Due to this, LED glows and gives high temperature
indication.
If you have any doubts about the
above circuit, don’t hesitate to comment.
Making a high temperature indicator circuit is not an easy task. Here, you are given a very simple but informative share with us. So it's good for those who wanna to learn about temperature indicator circuit.
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