CN104682904A - Audio automatic gain control amplification circuit for computer sound box - Google Patents
Audio automatic gain control amplification circuit for computer sound box Download PDFInfo
- Publication number
- CN104682904A CN104682904A CN201310630266.XA CN201310630266A CN104682904A CN 104682904 A CN104682904 A CN 104682904A CN 201310630266 A CN201310630266 A CN 201310630266A CN 104682904 A CN104682904 A CN 104682904A
- Authority
- CN
- China
- Prior art keywords
- resistance
- electric capacity
- amplifier
- unijunction transistor
- potentiometer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Amplifiers (AREA)
Abstract
The invention discloses an audio automatic gain control amplification circuit for a computer sound box. The audio automatic gain control amplification circuit comprises a power supply, first to seventeenth resistors, first to eighth capacitors, a first potentiometer, a second potentiometer, a first amplifier, a second amplifier, a first triode, a second triode, a first unijunction transistor and a second unijunction transistor, wherein the first unijunction transistor, the fourteenth resistor, the seventh resistor and the eighth resistor form an equivalent resistance voltage divider, the second unijunction transistor, the seventeenth resistor, the ninth resistor and the tenth resistor form an equivalent resistance voltage divider, when the input level of the first amplifier and the second amplifier is lower than 40mV, the output amplified of the first amplifier and the second amplifier is not sufficient for conducting the first unijunction transistor and the second unijunction transistor. The audio automatic gain control amplification circuit has the advantages that the dynamic range of the audio automatic gain control amplification circuit is greater than 50dB, the output waveform distortion is very small, the starting is fast, the circuit inputs 40-20mV adjustable levels and outputs 0-1.2V adjustable levels, the single-power-supply power supply is adopted, and the energy consumption is low.
Description
Technical field
The present invention relates to a kind of gain and control amplifying circuit, particularly relate to a kind of audio frequency amplifying electric circuit with auto-gain-controlling function for computer sound box.
Background technology
Automatic growth control makes the autocontrol method adjusted with signal strength signal intensity of amplifying circuit Gain Automaticly, audio amplifier refers to a kind of equipment that audio signal can be transformed to sound, sound is gone out by the playback of audio amplifier own after amplification process is carried out to audio signal, its sound is made to become large, audio amplifier comprises automatic gain control amplifier, the distortion of the audio frequency amplifying electric circuit with auto-gain-controlling function output waveform of traditional computer sound box is large, and starts slow, also there is complex structure and the high problem that consumes energy.
Summary of the invention
Object of the present invention is just to provide a kind of audio frequency amplifying electric circuit with auto-gain-controlling function for computer sound box to solve the problem.
In order to achieve the above object, present invention employs following technical scheme:
A kind of audio frequency amplifying electric circuit with auto-gain-controlling function for computer sound box, comprise power supply, first resistance is to the 17 resistance, first electric capacity is to the 8th electric capacity, first potentiometer, second potentiometer, first amplifier, second amplifier, first triode, second triode, first unijunction transistor and the second unijunction transistor, the positive pole of described power supply respectively with the cathode power supply end of described first amplifier, the first end of described 7th resistance is connected with the first end of described 11 resistance, the output of described first amplifier respectively with the first end of described first resistance, the first end of described 3rd resistance is connected with the first end of described first electric capacity, second end of described first resistance is connected with the first end of described second resistance, second end of described second resistance respectively with the first end of described 4th resistance, the output of described second amplifier is connected with the first end of described second electric capacity, second end of described second electric capacity is connected with the first end of described second potentiometer and the base stage of described first triode respectively, second end of described second potentiometer respectively with the emitter of described first triode, the first end of described tenth resistance, the first end of described 8th electric capacity is connected rear ground connection with the first base stage of described second unijunction transistor, the sliding end of described second potentiometer is the secondary signal output of described audio frequency amplifying electric circuit with auto-gain-controlling function, second end of described first electric capacity is connected with the first end of described first potentiometer and the base stage of described second triode respectively, the sliding end of described first potentiometer is the first signal output part of described audio frequency amplifying electric circuit with auto-gain-controlling function, second end of described first potentiometer respectively with the first end of described 3rd electric capacity, the first end of described 4th electric capacity, the emitter of described second triode, the first end of described 5th electric capacity, first base stage of described first unijunction transistor, the first end of described 15 resistance is connected rear ground connection with the first end of described 16 resistance, the in-phase input end of described first amplifier is connected with the second end of described 3rd resistance and the first end of described 5th resistance respectively, second end of described 5th resistance is connected with the second end of described 3rd electric capacity, the inverting input of described first amplifier respectively with the second end of described 7th resistance, the first end of described 8th resistance is connected with the first end of described 6th electric capacity, second end ground connection of described 8th resistance, second end of described 11 resistance respectively with the first end of described 12 resistance, the first end of described 9th resistance is connected with the first end of described 13 resistance, second end of described 12 resistance respectively with the collector electrode of described second triode, second end of described 5th electric capacity is connected with the emitter of described first unijunction transistor, second end of described 6th electric capacity is connected with the second base stage of described first unijunction transistor and the first end of described 14 resistance respectively, second end of described 14 resistance is connected with the second end of the 15 resistance, second end of described 14 resistance is the first signal input part of described audio frequency amplifying electric circuit with auto-gain-controlling function, second end of described 4th electric capacity is connected with the second end of described 4th resistance and the first end of described 6th resistance respectively, second end of described 6th resistance is connected with the in-phase input end of described second amplifier, the inverting input of described second amplifier respectively with the second end of described 9th resistance, second end of described tenth resistance is connected with the first end of described 7th electric capacity, second end of described 7th electric capacity is connected with the second base stage of described second unijunction transistor and the first end of described 17 resistance respectively, second end of described 17 resistance is connected with the second end of described 16 resistance, second end of described 17 resistance is the secondary signal input of described audio frequency amplifying electric circuit with auto-gain-controlling function, the collector electrode of described first triode respectively with the second end of described 13 resistance, second end of described 8th electric capacity is connected with the emitter of described second unijunction transistor.
Beneficial effect of the present invention is:
The present invention is a kind of audio frequency amplifying electric circuit with auto-gain-controlling function for computer sound box, the dynamic range of this audio frequency amplifying electric circuit with auto-gain-controlling function is greater than 50dB, the distortion of output waveform is very little, and start fast, circuit input 40 ~ 20mV and the adjustable level of output 0 ~ 1.2V, single power supply, consumes energy low, and this audio frequency amplifying electric circuit with auto-gain-controlling function also has the simple feature of structure.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of a kind of audio frequency amplifying electric circuit with auto-gain-controlling function for computer sound box of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described:
As shown in Figure 1, a kind of audio frequency amplifying electric circuit with auto-gain-controlling function for computer sound box of the present invention, comprise power supply VCC, first resistance R1 is to the 17 resistance R17, first electric capacity C1 is to the 8th electric capacity C8, first potentiometer RP1, second potentiometer RP2, first amplifier IC1, second amplifier IC2, first triode VT1, second triode VT2, first unijunction transistor Q1 and the second unijunction transistor Q2, the positive pole of power supply VCC respectively with the cathode power supply end of the first amplifier IC1, the first end of the 7th resistance R7 is connected with the first end of the 11 resistance R11, the output of the first amplifier IC1 respectively with the first end of the first resistance R1, the first end of the 3rd resistance R3 is connected with the first end of the first electric capacity C1, second end of the first resistance R1 is connected with the first end of the second resistance R2, second end of the second resistance R2 respectively with the first end of the 4th resistance R4, the output of the second amplifier IC2 is connected with the first end of the second electric capacity C2, second end of the second electric capacity C2 is connected with the first end of the second potentiometer RP2 and the base stage of the first triode VT1 respectively, second end of the second potentiometer RP2 respectively with the emitter of the first triode VT1, the first end of the tenth resistance R10, the first end of the 8th electric capacity C8 is connected rear ground connection with first base stage of the second unijunction transistor Q2, the sliding end of the second potentiometer RP2 is the secondary signal output end vo 2 of audio frequency amplifying electric circuit with auto-gain-controlling function, second end of the first electric capacity C1 is connected with the first end of the first potentiometer RP1 and the base stage of the second triode VT2 respectively, the sliding end of the first potentiometer RP1 is the first signal output part Vo1 of audio frequency amplifying electric circuit with auto-gain-controlling function, second end of the first potentiometer RP1 respectively with the first end of the 3rd electric capacity C3, the first end of the 4th electric capacity C4, the emitter of the second triode VT2, the first end of the 5th electric capacity C5, first base stage of the first unijunction transistor Q1, the first end of the 15 resistance R15 is connected rear ground connection with the first end of the 16 resistance R16, the in-phase input end of the first amplifier IC1 is connected with second end of the 3rd resistance R3 and the first end of the 5th resistance R5 respectively, second end of the 5th resistance R5 is connected with second end of the 3rd electric capacity C3, the inverting input of the first amplifier IC1 respectively with second end of the 7th resistance R7, the first end of the 8th resistance R8 is connected with the first end of the 6th electric capacity C6, the second end ground connection of the 8th resistance R8, second end of the 11 resistance R11 respectively with the first end of the 12 resistance R12, the first end of the 9th resistance R9 is connected with the first end of the 13 resistance R13, second end of the 12 resistance R12 respectively with the collector electrode of the second triode VT2, second end of the 5th electric capacity C5 is connected with the emitter of the first unijunction transistor Q1, second end of the 6th electric capacity C6 is connected with second base stage of the first unijunction transistor Q1 and the first end of the 14 resistance R14 respectively, second end of the 14 resistance R14 is connected with second end of the 15 resistance R15, second end of the 14 resistance R14 is the first signal input part Vi1 of audio frequency amplifying electric circuit with auto-gain-controlling function, second end of the 4th electric capacity C4 is connected with second end of the 4th resistance R4 and the first end of the 6th resistance R6 respectively, second end of the 6th resistance R6 is connected with the in-phase input end of the second amplifier IC2, the inverting input of the second amplifier IC2 respectively with second end of the 9th resistance R9, second end of the tenth resistance R10 is connected with the first end of the 7th electric capacity C7, second end of the 7th electric capacity C7 is connected with second base stage of the second unijunction transistor Q2 and the first end of the 17 resistance R17 respectively, second end of the 17 resistance R17 is connected with second end of the 16 resistance R16, second end of the 17 resistance R17 is the secondary signal input Vi2 of audio frequency amplifying electric circuit with auto-gain-controlling function, the collector electrode of the first triode VT1 respectively with second end of the 13 resistance R13, second end of the 8th electric capacity C8 is connected with the emitter of the second unijunction transistor Q2.
Operation principle of the present invention is as follows:
First unijunction transistor Q1, 14 resistance R14, 7th resistance R7, 8th resistance R8 forms equivalent resistance voltage divider, second unijunction transistor Q2, 17 resistance R17, 9th resistance R9, tenth resistance R10 forms equivalent resistance voltage divider, when the incoming level of the first amplifier IC1 and the second amplifier IC2 is lower than 40mV, input voltage equalization at the 14 resistance R14, 7th resistance R7, 8th resistance R8, 17 resistance R17, distribute between 9th resistance R9 and the tenth resistance R10, the output amplitude of the first amplifier IC1 and the second amplifier IC2 is not enough to make the first unijunction transistor Q1 and the second unijunction transistor Q2 conducting, first unijunction transistor Q1 and the second unijunction transistor Q2 is all as positive peak detector, when input voltage peak one peak value is higher than 40mV, first unijunction transistor Q1 and the second unijunction transistor Q2 conducting, signal after the first unijunction transistor Q1 and the second unijunction transistor Q2 detection and the first amplifier IC1 and the second amplifier IC2 amplification, export through the first potentiometer RP1 and the second potentiometer RP2.
Claims (1)
1. the audio frequency amplifying electric circuit with auto-gain-controlling function for computer sound box, it is characterized in that: comprise power supply, first resistance is to the 17 resistance, first electric capacity is to the 8th electric capacity, first potentiometer, second potentiometer, first amplifier, second amplifier, first triode, second triode, first unijunction transistor and the second unijunction transistor, the positive pole of described power supply respectively with the cathode power supply end of described first amplifier, the first end of described 7th resistance is connected with the first end of described 11 resistance, the output of described first amplifier respectively with the first end of described first resistance, the first end of described 3rd resistance is connected with the first end of described first electric capacity, second end of described first resistance is connected with the first end of described second resistance, second end of described second resistance respectively with the first end of described 4th resistance, the output of described second amplifier is connected with the first end of described second electric capacity, second end of described second electric capacity is connected with the first end of described second potentiometer and the base stage of described first triode respectively, second end of described second potentiometer respectively with the emitter of described first triode, the first end of described tenth resistance, the first end of described 8th electric capacity is connected rear ground connection with the first base stage of described second unijunction transistor, the sliding end of described second potentiometer is the secondary signal output of described audio frequency amplifying electric circuit with auto-gain-controlling function, second end of described first electric capacity is connected with the first end of described first potentiometer and the base stage of described second triode respectively, the sliding end of described first potentiometer is the first signal output part of described audio frequency amplifying electric circuit with auto-gain-controlling function, second end of described first potentiometer respectively with the first end of described 3rd electric capacity, the first end of described 4th electric capacity, the emitter of described second triode, the first end of described 5th electric capacity, first base stage of described first unijunction transistor, the first end of described 15 resistance is connected rear ground connection with the first end of described 16 resistance, the in-phase input end of described first amplifier is connected with the second end of described 3rd resistance and the first end of described 5th resistance respectively, second end of described 5th resistance is connected with the second end of described 3rd electric capacity, the inverting input of described first amplifier respectively with the second end of described 7th resistance, the first end of described 8th resistance is connected with the first end of described 6th electric capacity, second end ground connection of described 8th resistance, second end of described 11 resistance respectively with the first end of described 12 resistance, the first end of described 9th resistance is connected with the first end of described 13 resistance, second end of described 12 resistance respectively with the collector electrode of described second triode, second end of described 5th electric capacity is connected with the emitter of described first unijunction transistor, second end of described 6th electric capacity is connected with the second base stage of described first unijunction transistor and the first end of described 14 resistance respectively, second end of described 14 resistance is connected with the second end of the 15 resistance, second end of described 14 resistance is the first signal input part of described audio frequency amplifying electric circuit with auto-gain-controlling function, second end of described 4th electric capacity is connected with the second end of described 4th resistance and the first end of described 6th resistance respectively, second end of described 6th resistance is connected with the in-phase input end of described second amplifier, the inverting input of described second amplifier respectively with the second end of described 9th resistance, second end of described tenth resistance is connected with the first end of described 7th electric capacity, second end of described 7th electric capacity is connected with the second base stage of described second unijunction transistor and the first end of described 17 resistance respectively, second end of described 17 resistance is connected with the second end of described 16 resistance, second end of described 17 resistance is the secondary signal input of described audio frequency amplifying electric circuit with auto-gain-controlling function, the collector electrode of described first triode respectively with the second end of described 13 resistance, second end of described 8th electric capacity is connected with the emitter of described second unijunction transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310630266.XA CN104682904A (en) | 2013-11-27 | 2013-11-27 | Audio automatic gain control amplification circuit for computer sound box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310630266.XA CN104682904A (en) | 2013-11-27 | 2013-11-27 | Audio automatic gain control amplification circuit for computer sound box |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104682904A true CN104682904A (en) | 2015-06-03 |
Family
ID=53317568
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310630266.XA Pending CN104682904A (en) | 2013-11-27 | 2013-11-27 | Audio automatic gain control amplification circuit for computer sound box |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104682904A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105472506A (en) * | 2015-11-24 | 2016-04-06 | 宁波柏人艾电子有限公司 | Microphone circuit audio control circuit |
-
2013
- 2013-11-27 CN CN201310630266.XA patent/CN104682904A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105472506A (en) * | 2015-11-24 | 2016-04-06 | 宁波柏人艾电子有限公司 | Microphone circuit audio control circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204615772U (en) | A kind of audio power amplifying circuit | |
| CN203101477U (en) | Hall closed-loop current sensor | |
| CN203299260U (en) | Circuit capable of acquiring narrow pulse peak value | |
| CN204836095U (en) | Expansive flows circuit is put to fortune that can export positive negative voltage | |
| CN207354224U (en) | Power amplification circuit for speaker of voice box | |
| CN104682904A (en) | Audio automatic gain control amplification circuit for computer sound box | |
| CN103259496A (en) | Closed-loop negative-feedback modulation and demodulation switch power amplifier | |
| CN204795596U (en) | Broadcasting recording signal amplifier | |
| CN202649296U (en) | Speech warning circuit of DC power source | |
| CN203120140U (en) | Audio amplification circuit with standby function | |
| CN204482025U (en) | A kind of audio amplifier circuit | |
| CN203522658U (en) | Novel, simple power amplifier circuit | |
| CN203180837U (en) | Double-gain intermediate frequency amplifier | |
| CN203167252U (en) | Audio power overall-amplification circuit | |
| CN204929344U (en) | Acoustic control circuit | |
| CN205622602U (en) | Amplifier circuit based on triode | |
| CN206461581U (en) | Sensor filter amplification circuit | |
| CN203301429U (en) | Current amplifier applied to plane power supply | |
| CN204316441U (en) | A kind of virtual protection emitter-base bandgap grading manifold type amplifying circuit | |
| CN204304934U (en) | A kind of power amplification formula logical circuit | |
| CN207339656U (en) | A kind of step-up switching power supply | |
| CN104883145A (en) | Power amplified logic system based on constant current circuit | |
| CN104601120A (en) | Audio power amplifier with small degree of distortion | |
| CN204331531U (en) | A kind of temp. compensation type logic amplifies supply unit | |
| CN204180024U (en) | A kind of multimedia high tone quality power amplifier |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150603 |