Hello everyone, I've made a thermistor controlled comparator circuit which has got a relay connected to its output, when the temperature of the thermistor rises, the relay switches and the fan on its output is turned on the coll the thermistor down. Now, my circuit is working perfectly, but I'm getting a problem with my relay, which is that in normal condition when the coil of the relay is not being charged from the thermistor output, my relay is switching extremely fast and again and again, it switches from NC to NO then again from NO to NC at about twice or thrice per second. But when the coil is charged, it then switches permanently to start the fan connected to it. I dont know what I must do about the problem I'm facing in the normal condition. Thanks...!!