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Power Amp

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Submitted By larbearr72
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Summary of Theory
We will be combining a common-emitter (CE) amplifier with a common collector (CC) amplifier. This will allow us to have a high voltage gain with moderate input resistance and current gain with low output resistance. Together, the amplifiers will make a speaker with a low resistance load emit noises of different pitches at different frequencies. As with all amplifiers, there will be a small amount of power from the supply that will be wasted. The amplifier we will be building is a class A power amplifier. Therefore, the transistor is biased on at all times. This means that when no signal is present, the power in the transistor will be dissipated. Class B designs are more efficient than the class A design that we will be building. The reduced efficiency will not be a problem though since we are using a low power application. We can determine the worst case power dissipation in the transistor by the formula VCEQICQ. This can be done because when no signal is present, the power dissipation is highest in the transistor. A CE and a CC amplifier will be combined, in this experiment, to make an amplifier that will drive a small speaker. The driving amplifier will need to have a low output resistance, since the speaker is a low resistance device. A CE amplifier usually has a high output resistance. Because of this, a Darlington CC amplifier is used to keep the loading effect to a minimum. All dc parameters will be computed and then measured first. After the dc conditions are analyzed, the ac parameters will be computed and measured. Power input, power output, and power gain will then be calculated.

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