Audio earphone amplifier

Abstract

The invention relates to one audio earphone amplifier in electron sound technique field, which comprises front appendix buffer circuit, core power drive circuit, source direct current servo circuit, wherein, the audio input signals pass through level part, first integration computation amplifier, resistance RR2, first integration amplifier LM4766, resistance RoR1 and earphone socket; the resistance RR5 are over resistance RoR1 and LM4766 reverse phase end; LM4766 reverse phase input end is connected to earth resistance RR3; the resistance RR7 are over connection point and second integration amplifier NE5532 input end.

Description

technical field [0001] The invention relates to an audio headphone amplifier, which belongs to the technical field of electronic audio. Background technique [0002] In monitoring occasions such as broadcasting, recording, stage, or high-fidelity (Hi-Fi) music appreciation environment, it is often necessary to use high-fidelity audio headphones. As the front-end drive circuit of the earphone, the audio headphone amplifier must not only provide appropriate driving power, but also ensure the true reproduction characteristics of the signal, that is, it must have comprehensive indicators such as high fidelity, large dynamics, and good frequency response characteristics. [0003] At present, audio headphone amplifiers widely use three circuit design methods: direct drive of integrated operational amplifiers, full discrete devices, or a mixture of integrated and discrete devices. Products that use integrated operational amplifiers to drive directly have the advantages of simple ...

AI Technical Summary

Problems solved by technology

But the driving ability is limited, the internal resistance is high, and the fidelity is poor

The subjective sense of hearing is that the sound is not full enough and lacks a sense of transparency

Especially when driving high-impedance headphones, this shortcoming is more prominent

When the latter two solutions are adopted, although the problem of driving ability can be solved, the integration degree of the circuit is reduced.

Among them, another prominent disadvantage of using discrete devices is that the transistor parameters of differential and complementary circuits need to be strictly matched, which is not conducive to mass production

At the same time, due to the existence of pairing errors, it will affect indicators such as transient intermodulation distortion

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