What is the power amplifier?

The power amplifier is an electronic device that receives an electrical signal and rework it to amplify or increase its performance. Strengthening the power is achieved by significantly increased the input signal voltage. The power amplifier is used to power the output source such as a stereo speaker, relay or engine.

One of the most common features for power amplifier is in audio applications. The audio amplifier is designed to supply the speaker signal. In large systems, the electrical signal usually comes from sound mixing or preamplifier components. Power amplifiers are also found in small systems, such as typical home stereo settings. The power supply receives an alternating current (AC) from the electrical outlet and converts it to direct current (DC). The power supply sends the DC signal to the input phase, where the naetapa of the output is processed and prepared. The signal is then transferred to the output phase where the signal is actual amplification. The output phase is connected to the reproduceKTORU. The evaluation is referred to as the assessment of the power of the amplifier. The performance evaluation reflects the maximum power that the power amplifier is able to produce.

Most modern power amplifiers are models based on transistor. There are amplifiers that use vacuum tubes for their internal circuits. Transistor amplifiers are more common because they are more efficient and more cost -effective. In general, they are also smaller than the tube -style counterparts and are therefore easier to transport.

power amplifiers are divided into categories known as classes. The amplifier class reflects the design of its circuit. In audio applications, the amplifier class is determined by its output phase.

Most power amplifiers used in audio systems are classes A, B or AB. Class A amplifiers are distinguished for very low distortion levels. AMP Class B usually costs less than zClass A and and in general is more efficient in overall operation. However, the quality of the output is not so good, especially at low signal levels.

AB amplifiers are an attempt to combine the best of both worlds. They are cheaper than class A models, but provide a signal that is better that provides class B amplifiers. AB class is perhaps the most widely used amplifier in domestic stereo systems.