High-fidelity transistor audio power amplifier

An audio power and transistor technology, which is applied in the field of high-fidelity transistor audio power amplifiers, can solve the problems of unfavorable hearing, amplifier frequency response and adverse effects on sound quality, etc., and achieves the effect of soft hearing, improving hearing and improving frequency response.

Inactive Publication Date: 2013-05-22
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing transistor audio power amplifiers usually consist of pre-amplifiers and post-amplifiers. I have seen many circuits at home and abroad, including audio power amplifiers in the United States, Britain, Germany and other countries. To make the circuit work stably, coupling capacitors are added to the signal input and output

Method used

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  • High-fidelity transistor audio power amplifier

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] see image 3 , a high-fidelity transistor audio power amplifier is mainly composed of a preamplifier and a postamplifier. The input terminal of the pre-amplifier is connected to the audio input signal input by the external audio input device, the output terminal of the post-amplifier is connected to the external audio output device (such as an external speaker system), and the output terminal of the pre-amplifier is connected to the input of the post-amplifier. terminals are connected through a resistor. The high-fidelity transistor audio power amplifier realizes the direct current and broadband of the circuit, and can effectively improve the sense of hearing.

[0035] The above-mentioned preamplifier such as figure 1 As shown, it is mainly composed of a volume adjustment circuit connected to the signal source circuit, an inverse proportional amplification circuit and a second-order active emitter-follower circuit. The input end of the volume adjustment circuit is di...

Embodiment 2

[0052] see Figure 4 , Embodiment 2 is substantially the same as Embodiment 1, the difference is that the input end of the AC / DC negative feedback circuit and the final power transistor VT of the improved three-stage Darlington push-pull output stage circuit 117 , VT 118 The collector terminal is connected to the output terminal.

Embodiment 3

[0054] see Figure 5 , Embodiment 3 is substantially the same as Embodiment 2, the difference is that the final power transistor VT of the improved three-stage Darlington push-pull output stage circuit 117 , VT 118 It is a power field effect tube. see Figure 5 . At this time, the relevant final stage power triode VT in Embodiment 1 117 , VT 118 The base in is the final power transistor VT 117 , VT 118 Grid in; In embodiment 1, relevant final stage power triode VT 117 , VT 118 The emitter in is the final power transistor VT 117 , VT 118 The source in; the relevant final stage power triode VT in embodiment 1 117 , VT 118 The collector in is the final power transistor VT 117 , VT 118 in the drain.

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Abstract

The invention discloses a high-fidelity transistor audio power amplifier which mainly comprises a prime amplifier and a post amplifier. An input port of the prime amplifier is connected with an audio input signal input by an external audio input device, the output port of the post amplifier is connected with an external audio output device, and the output port of the prime amplifier is connected with the input port of the post amplifier through a resistor. The post amplifier mainly comprises a common-emitter common-base differential input stage circuit, a common-emitter common-base principal voltage amplification stage circuit, a UBE multiplying and temperature protection circuit, an improved three-level Darlington push-pull output stage circuit, an alternative circuit / direct current negative feedback circuit, an active servo circuit, a voltage-stabling and filter circuit, a constant flow source circuit, an image constant flow source, two RC resistor-capacitor filter circuits, four capacitor filter circuits, a horn protection circuit and a post power circuit, wherein the power circuit supplies electricity to the common-emitter common-base differential input stage circuit, the common-emitter common-base principal voltage amplification stage circuit, the UBE multiplying and temperature protection circuit, the improved three-level Darlington push-pull output stage circuit, the alternative circuit/direct current negative feedback circuit, the active servo circuit, the voltage-stabling and filter circuit, the constant flow source circuit, the image constant flow source, the two RC resistor-capacitor filter circuits, the four capacitor filter circuits and the horn protection circuit. The high-fidelity transistor audio power amplifier achieves the conditions that a circuit is direct-current and wide-band, and can effectively improve listening feelings.

Description

technical field [0001] The invention relates to the field of audio power amplifiers, in particular to a high-fidelity transistor audio power amplifier. Background technique [0002] At present, household transistor high-fidelity audio power amplifiers, household electronic tube high-fidelity audio power amplifiers, professional audio power amplifiers, and car audio audio power amplifiers are all developing rapidly. Existing transistor audio power amplifiers usually consist of pre-amplifiers and post-amplifiers. I have seen many circuits at home and abroad, including audio power amplifiers in the United States, Britain, Germany and other countries. To make the circuit work stably, coupling capacitors are added to the signal input and output terminals of the pre-amplifier and the signal input of the post-amplifier. However, the added coupling capacitors will have a certain adverse effect on the frequency response and sound quality of the amplifier. Moreover, the circuit they ...

Claims

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Application Information

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IPC IPC(8): H03F3/20
Inventor 秦冬成谭长云黄文斌蒙梁刘达见
Owner GUILIN UNIV OF ELECTRONIC TECH
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