The Transistor is used as a amplifying element which is used to amplify the given signal. The amplifier is the semiconductor device and which contain 3 terminals for connection to external circuits. Materials most commonly used are silicon, gallium-arsenide, and germanium, into which impurities have been introduced by a process called “doping.”
The Transistor is the fundamental block of the electronic devices and most of the electronic systems. A transistor may be used as a switch and as an amplifier .The amount of current amplification is called the current gain, symbol hFE.
