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Simple electrical circuit diagram maker8/22/2023 But when the temperature of NTC will increase then the resistance of this thermistor will LOW and the maximum voltage will pass across this to the ground and pin 2 gets LOW as compared with pin 3 and the voltage level at the pin will go HIGH. ![]() In this case, the voltage at pin 2 is HIGH and at pin 3 will be LOW as compared with pin 2 voltage. At the normal temperature, the resistance of NTC has high so the high voltage signal will go at the pin of 2 because of voltage will not be dropped by the flowing with the ground as the NTC has high resistance. Working of the circuit– NTC thermistor is a type of resistor but this has special properties, When the temperature of NTC thermistor will increase, the resistance will decrease and when the temperature will decrease the resistance of it will increase. By using an NTC (negative temperature coefficient) comparator ic gets a signal to make its output High. This circuit consists of an LM358 comparator ic that makes this highly sensitive. ![]() ![]() This circuit can be used in an automatic controlling circuit to prevent a device to damage from overheating. You get a signal from the buzzer when cross the heat to a fixed level. Contactless electric line tester detect the line when the sensor wire touched over the cover of wireĪdjust the preset to what level of temperature you want to automatically detect.
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