2N2907A transistor is a semiconductor device used to amplify or switch electronic signals and electrical power. It is composed of semiconductor material usually with at least three terminals for connection to an external circuit. A voltage or current applied to one pair of the transistor’s terminals controls the current through another pair of terminals. The transistor is having DC current gain value of 100 to 300 which shows the amplification capacity of the transistor. As it is used for the amplification and switching.