DESIGN AND CONSTRUCTION OF A SPEECH AMPLIFIER
Many centuries back people found it difficult to be heard over a few metres away from them while addressing their audience. This motivated the need for man to pursue new technologies
which will increase his reliability and efficiency. Man in search of the audio
boosting instrument developed an aspect of communication called “Public Address System (PAS)”, which helps an individual to address or communicate to a large group of people. Through this system for instance, a clergyman can address his congregation, an entertainer can communicate to his audience, a politician can address his supporters and so on.
The Public Address System (PAS) comprises of a microphone which converts sound energy to electrical energy, an amplifier which increases the strength of the electrical signals and a loudspeaker which reconverts the electrical energy of the signals to sound energy.
In the PAS, the sound energy at the loudspeaker has greater power than that at the microphone hence, the sound is more louder. This reduces the stress of the individual using the microphone from shouting. The power output of the speaker depends on the power rating of the loudspeaker and that of the amplifier.
Moreover, an amplifier may be defined as a system or an electronic circuit which accepts signals at its input and gives out signals at its output grater than the signal at its input in amplitude or power or current. The output signal is similar to the input signal in shape, form and frequency
TABLE OF CONTENT
Title page certification
Table of content
Objective of study
Scope of Study
Background of Study
Definition of terms
Classes of Amplifiers
CHAPTER THREE: Methodology
The First Stage
The Second Stage
The Output Stage
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