Over/ Under voltage protection of electrical appliances projects main idea is to implement a electronic circuit which can disconnect power supply form electronic appliances like television, refrigerator ..etc when there is low power or high power. In this project IC LM324 operational amplifier is used as comparator. Basically IC LM324 consists of four operational amplifiers among them only two of them are used in this project. Inverting and Non- inverting terminals are maintained at 6.0V and 6.8V respectively.

In this paper we will cover working principle of the project with circuit diagram. Turning on and off of appliances will depend on the voltage level variations when voltage exceeds 6.8V then non inverting terminal to automatically turn of the device similarly if the voltage level is decreased less than 6.0V same functionality is continued.

download Over/ Under voltage protection of electrical appliances project report