With the circuit in the figure, it is possible to control the amount of heat generated by the heating element. The heating element can operate with voltages up to 25 V and a maximum current of 3 amps. The maximum input voltage of this circuit is 35 V, and for normal operation it must be at least 2 V more than the voltage required by the heating element. The circuit sensor is an LM334 that must be placed close to where the heater is located to detect the temperature of its environment. The circuit can be used in greenhouses, brooders and in biology experiments. The circuit is adjusted in the 100k ohms potentiometer for the temperature to be maintained.
