The Knowledge of Amplifier

- Sep 11, 2018-

Preamplifier: The preamplifier is the preamplifier and control section of the amplifier before it is used to enhance the voltage amplitude of the signal, providing input signal selection, tone adjustment and volume control. The preamplifier is also called the preamplifier.

Pure post amplifier: The power amplifier is an electronic device for enhancing the signal power to drive the sound of the speaker. A power amplifier without an accessory function such as source selection and volume control is called a post amplifier.

Integrated amplifier refers to a constant-voltage amplifier with preamplifier, which can be connected directly to a microphone and other sources without a mixer. The output voltage does not change with the change of the load impedance, that is, the power amplifier whose output audio signal has the same maximum voltage. Due to the deep negative feedback, the output voltage is very stable, and the load connected to the amplifier is within the rated power range. The impact is small. In order to reduce the power loss of the transmission line in long-distance power transmission, an output transformer is needed. The output voltage is mainly 70V, 90V, 120V, etc. The higher the voltage, the smaller the transmission line loss, but the sound quality is not very good due to the use of the output transformer. Generally used in background music systems and cable broadcasting systems, etc.

An amplifier that mounts both preamplifier and power amplifier in the same chassis is called an integrated amplifier.

 

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