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Tue Jan 18, 2011 2:59 pm

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The following circuit can detect fire & making a loud sound from its buzzer when D1 receives high temperature. Ordinary signal diodes like IN 34 and OA 71 exhibits this property and the internal resistance of these devices will decrease when temperature rises. In the reverse biased mode, this effect will be more significant. Typically the diode can generate around 600 mV at 5 degree centigrade. For each degree rise in temperature; the diode generates 2 mV output voltage. That is at 5 degree it is 10 mV and when the temperature rises to 50 degree, the diode will give 100 mV. This voltage is used to trigger the remaining circuit. Transistor T1 is a temperature controlled switch and its base voltage depends on the voltage from the diode and from VR and R1.
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Fri Jan 21, 2011 4:44 pm

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great. thanks

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Mon Sep 19, 2011 9:51 am

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thanks bro.


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