This video lecture from Electronics (F.Sc. 2nd year physics) This video explains about one of the application of Operational amplifier that is Comparator and further define one application of compaartor as an night switch and this example commonly used in our daily life.Find more e-learning material and educational video lectures in Urdu at maktab.pk. These videos are free to use for promotional and commercial purpose by keeping the credits to Maktab