INTRODUCTION
An audio AMP is basically a system
which is used as a means of increasing the level of sound or audio signals for
maximum use.
A public address system consists
basically of microphone, Amplifier and
speaker(s) to facilitate the communication to intelligible speech to groups of
people or an audience. The main purpose of providing sound reinforcement
indoors with sufficient high – fidelity being the coverage of large groups with
unobstrusive sound system. Directional horns are often employed in outdoor
systems to concentrate sound energy efficiently over the areas served.
Intelligibility may be the performance criteria for an indoor system such as an
air waiting room. On the other hand, high fidelity reproduction is required for
sound reinforcement system for instance, a conference hall, or a class room.
Most power amplifiers of a public
address system have provisions for one or more microphones and one or other
sound sources such as FM, AM radio tuner output, tape recorder and record
player generally tagged auxiliary sound sources. Level traders or volume
contracts are provided to adjust the volume of each of those sources
independently.
In this project, the concentration of
a high fidelity (H1 – F1) power amplifier for the in public address system.
This amplifier is designed as a unit
utilizing three input sources. Operating controls are provided for each input
source with the possibility of mixing the three input sources depending on the
setting of the operating or gain controls.
This flexibility of mixer operation is
without sudden increase or decrease in volume.
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