Circuit structure used for amplifying audio signal

Abstract

The invention discloses a circuit structure used for amplifying an audio signal. The circuit structure comprises a voltage amplification circuit, a power amplification circuit, a power supply, a loudspeaker, a first capacitor, a second capacitor and a fifth capacitor, wherein the voltage amplification circuit is provided with a first input end, a second input end and an output end; the power amplification circuit is provided with a first input end, a second input end and an output end; one end of the first capacitor is connected with the first input end of the voltage amplification circuit, the second input end of the voltage amplification circuit is connected with the power supply, the output end of the voltage amplification circuit is connected with one end of the second capacitor, the other end of the second capacitor is connected with the first input end of the power amplification circuit, the second input end of the power amplification circuit is connected with the power supply, the output end of the power amplification circuit is connected with one end of the fifth capacitor, and the other end of the fifth capacitor is connected with one end of the loudspeaker. The circuit structure provided by the invention adopts an integrated dual operational amplifier as the voltage amplifier, thus being small in size, good in performance and cheap in price.

Description

technical field [0001] The invention relates to a circuit structure, in particular to a circuit structure for amplifying audio signals. Background technique [0002] Audio is a technical term, all sounds that humans can hear are called audio, which may include noise, etc. After the sound is recorded, whether it is speaking, singing, or music, it can be processed by digital music software, or it can be made into a CD. At this time, all the sounds remain unchanged, because CDs are originally a type of audio files. The audio is just the sound stored in the computer. If there is a computer with a corresponding audio card, that is, the sound card we often say, we can record all the sounds, and the acoustic characteristics of the sound, such as the level of the sound, can be used. It is stored as a file on the computer's hard drive. Conversely, we can also play the stored audio file with a certain audio program to restore the previously recorded sound. [0003] After entering t...

AI Technical Summary

Problems solved by technology

[0004] However, for some occasions with low power requirements, such as car radios, tape recorders, alarms, etc., the cost performance is particularly important, and the audio amplifiers used in these occasions in the prior art are either large in size or poor in performance.

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