Please give me a detail about power amplifier and more detail about any application were used this equipment.
2007-04-27 16:39:28 · 6 answers · asked by are m 1 in Science & Mathematics ➔ Engineering
Generally, an amplifier is any device that uses a small amount of energy to control a larger amount of energy. In popular use, the term today usually refers to an electronic amplifier, often as in audio applications. The relationship of the input to the output of an amplifier — usually expressed as a function of the input frequency — is called the transfer function of the amplifier, and the magnitude of the transfer function is termed the gain.
Popular for high power RF amplifiers, Class C is defined by conduction for less than 180° of the input signal. Linearity is not good, but this is of no significance for single frequency power amplifiers. The signal is restored to near sinusoidal shape by a tuned circuit, and efficiency is much higher than A, AB, or B classes of amplification
2007-04-27 18:56:42 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Generally class B and Class C amplifiers are called the power amplifiers and Class A is called signal amplifier.
Class A uses full wave amplification, has more losses and is used to condition the signal from weak source. Or for low power applications.
Class B and C are push pull amplifiers used for higher power applications. They amplify upper half and lower half of a wave separately. they have lower losses too and power delivery is high.
2007-04-27 20:02:04 · answer #2 · answered by dipakrashmi 4 · 0⤊ 0⤋
'Power amplifier' is something of a catch-all term, like 'fast car'. It's relative to the rest of the circuits in the system so it doesn't have any particular definition in terms of wattage. Generally, the 'power amplifier' stage of a piece of equipment is the last stage of amplification before something is done with the signal (such as drive a speaker or headphones, drive a servo moter, supply power to a heater in a constant temperature controller, etc.)
HTH
Doug
2007-04-27 16:45:33 · answer #3 · answered by doug_donaghue 7 · 0⤊ 0⤋
An amplifier system consists of signal pick-up transducer, followed by a small signal amplifier(s), a large signal amplifier and an output transducer. A transducer is used to convert one form of energy into another type. For example a microphone is used to convert acoustical energy into electrical energy. Conversely, a loudspeaker is used to convert electrical energy into acoustical energy. A motor is a transducer that is used to convert electrical energy into mechanical energy.
The input transducer produces small electrical (typically voltage) signal, that needs sufficient amplification to operate some output device such as a loudspeaker, a servomotor, a solenoid or relay. The factors of prime interest in small signal voltage amplifiers are usually linearity and gain. Since the signal voltage and current from the input transducer is usually very small, the amount of power handling capacity and power efficiency are of slight concern. The functions of voltage amplifiers are to present a high resistance to the input transducer to minimize loading effects and to provide a large enough voltage signal to the large-signal amplifier stages to operate such output devices (loudspeaker, servomotor etc.). A large-signal amplifier must operate efficiently and be capable of handling large amounts of power-typically, a few watts to hundred of watts. Large signal amplifier that drives the output transducer demands even more consideration than the small-signal voltage amplifiers that we have focused so far. The factors of greatest concern to the large signal power amplifiers are the power efficiency of the circuit, the maximum amount of power that the circuit is capable of handling, and impedance matching to the output device.
Power amplifier is meant to raise the power level of the input signal. In order to get large power at the output, it is necessary that the input-signal voltage is large. That is why, in an electronic system, a voltage amplifier always precedes the power amplifier, also, that is why power amplifiers are called large-signal amplifiers.
https://www.electrikals.com/
2015-08-07 23:28:32 · answer #4 · answered by shaun 4 · 0⤊ 0⤋
Power amplifier is use to enhance power capacity if you have
100 watt instrument but the source only have 75 watt for example you can use these instrument.
2007-04-27 16:51:55 · answer #5 · answered by Faisal R 3 · 0⤊ 0⤋
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2016-12-16 17:29:13 · answer #6 · answered by ? 4 · 0⤊ 0⤋