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The aim of education is the knowledge, not of facts, but of values

Monday 10 September 2012

DESIGINING OF OVERHEATING ALARM USING 555 TIMER IC


The overheating alarm is use for detecting a high temperature in any system where it is use. It contains a buzzer which is on when a system attain a temperature level. It is simple circuit which have easily installation. Overheat alarm circuit consists a thermistor i.e. a heat sensor which detects the raise on heat and within some mechanism buzzer produces sound. We know thermistor is a kind of resistor,used as heat sensor which offers low resistance at high temperature and high resistance at low temperature and the same concept is used here for detecting overheat. The difference in values of op amp 324 inverting and non inverting terminal voltages  decides the switching on and off for the circuit to drive IC 555 for generating pulse train which produce beep alarm by buzzer.. At normal temperature, the resistance of the Thermistor is approximately 10 kilo-ohms, which reduces to a few ohms as the temperature increases beyond 100 C. The circuit uses readily available components and can be easily constructed on any general-purpose PCB.

                                    
Here i give the link of the report file regarding of this minor project     

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