High-fidelity preceding stage simulation operational amplifier electronic circuit for sound power amplifier
An electronic circuit and operational amplifier technology, applied in the field of audio power amplifier high-fidelity pre-stage analog operational amplifier electronic circuit, can solve the problems of small dynamics, poor separation, hard hearing and sound, and achieve the effect of making up for loss
Inactive Publication Date: 2017-05-10
ZHENGZHOU BEIDOU COMM TECH
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On the other hand, in order to reduce costs, current pre-amplifier manufacturers use a two-channel IC, which has poor separation, low dynamics, hard listening, and unclear layers, which is difficult to meet the needs of modern people.
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[0008] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0009] see figure 1 , in an embodiment of the present invention, a high-fidelity front-stage analog op-amp electronic circuit of an audio power amplifier divides the audio signals of the left and right channels at the input end into two channels, one uses a field effect tube, and the other is an audio compensation circuit. The processed audio signal is then output to the input terminal of the op amp; first, it goes to the ground through the decoupling resistor...
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The invention discloses a high-fidelity preceding stage simulation operational amplifier electronic circuit for a sound power amplifier. A technical scheme is as follows: first of all, grounding via decoupling resistor and capacitor; then, dividing into two paths by employing the resistor for transmission, wherein one path of main signals are output to a preceding stage operational amplifier input end via an emitting stage circuit of a field-effect transistor, and the other path of audio signals undergo two-stage amplification processing and two-stage feedback processing; adjusting a working state point, a feedback coefficient and a frequency point of the circuit well, and enabling the processed audio signals to merger with the other path of the main signals together and simultaneously to output to the preceding stage operational amplifier input end; and then, coupling the audio signals processed by operational amplifiers to an audio power amplifier via one emitting state circuit for amplification, and restoring sweet musical sound via a horn. According to the high-fidelity preceding stage simulation operational amplifier electronic circuit disclosed by the invention, two monophonic high-speed operational amplifiers IC are adopted and work independently, and additionally, an automatic frequency compensation circuit is further utilized, so the loss of music signals in transmission is made up, the trueness of the music is restored, and a music presence feeling is brought to an appreciator.
Description
technical field [0001] The invention relates to an operational amplifier electronic circuit, in particular to a high-fidelity front-stage analog operational amplifier electronic circuit of an audio power amplifier. Background technique [0002] At present, the pre-amplifier of the audio power amplifier on the market only uses an IC, which simply amplifies the audio signal. If the audio input source is noisy, it will also be amplified by the pre-stage, and there will be noise when it is restored. On the other hand, in order to reduce costs, current pre-amplifier manufacturers use a two-channel IC, which has poor separation, low dynamics, hard listening, and unclear layers, which is difficult to meet the needs of modern people. Contents of the invention [0003] The object of the present invention is to provide a high-fidelity front-stage analog operational amplifier electronic circuit of an audio power amplifier to solve the problems raised in the above-mentioned backgroun...
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IPC IPC(8): H04R3/00H04R1/20
CPCH04R3/00H04R1/20H04R2201/028
Inventor 不公告发明人
Owner ZHENGZHOU BEIDOU COMM TECH