Report Essay Example | Topics and Well Written Essays - 1000 words - 4

Report - Essay Example The resultant signal is channelled into the powered amplifier. The role of the power amplifier is to drive the loudspeaker. The circuit is designed such that the mixer contains a gain that can be varied, depending on the desirability of the required volumes. In addition, there should be the allowance for the volume of one channel to be controlled separately from another. This enhances the quality of sound as this enables one to have balance between the two channels. In this regard, the presented diagram consists of a set of two inputs; the speech and music. In this case, the speech voltage controls the music voltage. The operation of the circuit project only requires that the two signals are combined while the current should be adjusted to be adequate to make the speakers work effectively. It is expectable that in the cases where speech signal is lacking, the music voltage from the difference amplifier is about 1V. In the cases where the speech signal is peak, the voltage is expected to be at the minimum level, at around 0.17V. In this regard, mixing the speech and music amplifier creates the allowance to have the music volume by varying the voltage of the speech signal. Even so, the mixer’s output does not have the power capacity of driving the speakers. In this regard, it is expectable that when the amplitude of the mixer’s input is raised by a gain of well over 10 units, as well as utilizing the class B type of amplifier so that adequate current can be generated, the circuit would work successfully. The amplifier is connected to the speakers. About Power amplifiers Conventionally, most power amplifiers make use of the output stage, in the cases where a single transistor handles a half of the waveform signals and this is regardless of whether the half is negative or positive. This operation is often labelled as the push-pull. Its efficiency is unquestionable, considering that only minimal current flows when music signal is lacking. Furthermore, this comes with the implication that the compact power supply may be the only most essential component; hence it cost-effectiveness to the manufacturer. For the user, the resultant amplifier is relatively small in size, efficient and cheap. The power amplifier functions to deliver power, a product of load current and voltage. Power= IV I ~ Current V ~ Voltage In the basic sense, a power amplifier shares a lot of commonalities with the voltage amplifier. The only difference between the two is that in the power amplifier, the resistance of the load that is connected to the output is relatively low, for instance, a loudspeaker consisting of 7 ohms that triggers the flow of high current through the transistor’s collector. In consideration to the high currents that flow through the loads, it is imperative that the output transistors that are applied in the amplification of power should have high resistance. There are two categories of amplifiers that could be used; A-type and B-ty pe amplifiers. The A-type amplifiers are those in which the output current assumes the inputs’ full cycle, creating the allowance of the transistors to be forward-biased through the input cycles, without switching off. The following is an extract of the diagram for the A-type amplifier. Figure 1: A-type Amplifier On the other hand, the B-type amplifier is that which is designed to improve the energy of efficiency of the A-type amplifier, ensuring for the reduction of the amount of heat loss? Besides, its signal assumes a half