The simple circuit of this low cost temperature controller may be used for the following couple of important applications:
To Protect Power Transistors: In many electronic circuits power transistors perform vital functions of controlling heavy output loads and therefore may get heated up to appreciable limits. Though these are always fitted over aluminum heat sinks for optimum cooling, the temperature at times may cross uncontrollable levels.
The sensor of the present circuit can be integrated to the heat sink and the relay contacts may be wired either to a cooling fan or may be simply used to switch OFF the power so that the heat may not exceed to a damaging limit.
In Poultry Farms: The newly hatched chickens inside poultry farms are very vulnerable to the changing climatic conditions. A proper regulation of the temperature around them thus becomes very essential. Usually hi-power incandescent bulbs are used to keep the inside atmosphere of the poultry farm warm and conducive to the baby chickens, but if the intensity of these bulbs are not controlled, things can get hazardous.
Again, by attaching the sensor of the proposed electronic temperature controller circuit to a particular bulb may be effectively used to switch them OFF in case the ambient temperature rises to a critical point thus helping to keep the average farm temperature to a healthy proportion.
Readers may customize and modify this diy temperature controller circuit as per their own needs and specifications to find its numerous other applications. Just remember to keep the reference diode far away from the temperature which is to be sensed.