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This capacitor couples the input signal to the base of the transistor. The resistors R 1, R 2 and R E form the biasing and stabilization circuit, which helps in establishing a proper operating point. The various prominent circuit elements and their functions are as described below. The circuit of a practical transistor amplifier is as shown below, which represents a voltage divider biasing circuit. Practical Circuit of a Transistor Amplifier

Hence this transistor acts as an amplifier. Hence a small input at the base gets amplified as the signal of larger magnitude and strength at the collector output. Now, as the collector current increases, the voltage drop across the resistor R C also increases, which is collected as the output. (As the collector current is β times of the base current which means I C = βI B). Due to the transistor action, a larger current flows in the collector of the transistor. When a weak input signal is given to the base of the transistor as shown in the figure, a small amount of base current flows. The following circuit diagram shows how a single stage transistor amplifier looks like. A Single stage transistor amplifier has one transistor, bias circuit and other auxiliary components. When only one transistor with associated circuitry is used for amplifying a weak signal, the circuit is known as single-stage amplifier.Īnalyzing the working of a Single-stage amplifier circuit, makes us easy to understand the formation and working of Multi-stage amplifier circuits. Let us see how a single-stage amplifier is built, which is the basic for a Multi-stage amplifier. A number of single-stage amplifiers are cascaded to form a Multi-stage amplifier. We find the use of amplifiers in medical devices, scientific equipment, automation, military tools, communication devices, and even in household equipment.Īmplification in practical applications is done using Multi-stage amplifiers. Almost all electronic equipment must include some means for amplifying the signals.

The process of increasing the signal strength is called as Amplification. Let us now try to understand the fundamental concepts of a basic amplifier circuit.Īn electronic signal contains some information which cannot be utilized if doesn’t have proper strength. We hope that you have gained sufficient knowledge on operating point, its stability and the compensation techniques in the previous chapter.