Question

Transistor as an amplifier.. . introduction and Reference​

Answer 1

Answer:

Transistor is an amplifier .

Introduction :

A transistor acts as an amplifier by raising the strength of a weak signal.

The DC bias voltage applied to the emitter base junction, makes it remain in forward biased condition.

Thus a small input voltage results in a large output voltage, which shows that the transistor works as an amplifier.

Reference :

The common-emitter amplifier is designed so that a small change in voltage (Vin) changes the small current through the base of the transistor.

It's current amplification combined with the properties of the circuit means that small swings in Vin produce large changes in Vout.

Hope this helps ✌️

Answer 2

Introduction:-

Transistor as an amplifier

The common-emitter amplifier is designed so that a small change in voltage (Vin) changes the small current through the base of the transistor whose current amplification combined with the properties of the circuit means that small swings in Vin produce large changes in $v_{out}$.

Various configurations of single transistor amplifiers are possible, with some providing current gain, some voltage gain, and some both.

From mobile phones to televisions, vast numbers of products include amplifiers for sound reproduction, radio transmission, and signal processing. The first discrete-transistor audio amplifiers barely supplied a few hundred milliwatts, but power and audio fidelity gradually increased as better transistors became available and amplifier architecture evolved.[71]

Modern transistor audio amplifiers of up to a few hundred watts are common and relatively inexpensive.

Reference:- Wikipedia