When in an amplifier circuit only one transistor is used for amplifying a weak signal, the circuit is known as single stage amplifier.

However, a practical amplifier consists of a number of single stage amplifiers and hence a complex circuit. Therefore, such a complex circuit can be conveniently split into several single stages and can be effectively analysed.

The above fig. shows a single stage transistor amplifier.

When a weak a.c. signal is applied to the base of the transistor, a small base current starts flowing in the input circuit.

Due to transistor action, a much larger (β times the base current) a.c. current flows through the the load Rc in the output circuit.

Since the value of load resistance Rc is very high, a large voltage will drop across it.

Thus, a weak signal applied

The various circuit elements and their functions are described as follows :

(i) Biasing Circuit. ...

(ii)InputCapacitor (Cin) ...

(iii) Emitter Bypass Capacitor (CE) ...

(iv) Coupling Capacitor (CC) ...

Various Circuit Currents.

(i)BaseCurrent. ...

(ii) Collector Current. ...

(iii) Emitter Current.