CN104682892A - Audio frequency amplifier used for computer speakers - Google Patents
Audio frequency amplifier used for computer speakers Download PDFInfo
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- CN104682892A CN104682892A CN201310612138.2A CN201310612138A CN104682892A CN 104682892 A CN104682892 A CN 104682892A CN 201310612138 A CN201310612138 A CN 201310612138A CN 104682892 A CN104682892 A CN 104682892A
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- amplifier
- resistance
- electric capacity
- potentiometer
- audio frequency
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Abstract
The invention discloses an audio frequency amplifier used for computer speakers. The audio frequency amplifier comprises a power supply, a button switch, first to sixth resistors, first to third amplifiers, first to fifth capacitors, a first potentiometer, a second potentiometer and a loudspeaker. An audio signal enters the third amplifier. After the weak signal is amplified, the signal enters a buffer isolation amplifier circuit formed by the first amplifier, the first capacitor, the second resistor, the first potentiometer and the second capacitor. The buffer isolation amplifier circuit has the characteristics of high input impedance and low output impedance, so that the signal load capacity of the third amplifier is improved and the impact of fluctuation of signals in the second amplifier on signals in the first amplifier is avoided. According to the invention, the buffer isolation amplifier circuit is formed by the first amplifier, the first capacitor, the second resistor, the first potentiometer and the second capacitor, and through the buffer isolation amplifier circuit, the fluctuation impact of fluctuation of the signals in the final amplifier on the prime amplifier can be avoided.
Description
Technical field
The present invention relates to a kind of audio frequency amplifier, particularly relate to a kind of audio frequency amplifier for computer sound box.
Background technology
Audio amplifier is the terminal of whole sound system, its effect is that audio frequency electric energy is converted to corresponding acoustic energy, and it is radiated space, it is the extremely important part of sound system, the signal of telecommunication is transformed into acoustical signal directly listens to so mission critical because which is responsible for the ear of people, audio frequency amplifier in audio amplifier is used for audio signal to amplify, desktop computer is all equipped with audio amplifier, the final amplifier of the audio frequency amplifier of traditional computer sound box easily causes influence of fluctuations to pre-amplifier, and easily cause the load capacity of chopped-off head amplifier signal to reduce, 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 amplifier 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 amplifier for computer sound box, comprise power supply, push-button switch, first resistance is to the 6th resistance, first amplifier is to the 3rd amplifier, first electric capacity is to the 5th electric capacity, first potentiometer, second potentiometer and loud speaker, the positive pole of described power supply is connected with the first end of described push-button switch, second end of described push-button switch is connected with the first end of described first resistance and the cathode power supply end of described second amplifier respectively, second end of described first resistance is connected with the cathode power supply end of described first amplifier, the inverting input of described first amplifier respectively with the first end of described 4th resistance, the output of described 3rd amplifier, the first end of described second potentiometer is connected with the sliding end of described second potentiometer, the in-phase input end of described first amplifier is connected with the output of described first amplifier and the first end of described first electric capacity respectively, second end of described first electric capacity is connected with the first end of described second resistance, second end of described second resistance is connected with the first end of described first potentiometer, second end of described first potentiometer respectively with the second end of described 4th resistance, the in-phase input end of described second amplifier, the negative electricity source of described 3rd amplifier, the negative electricity source of described second amplifier, the first end of described 5th resistance, the first end of described 3rd resistance is connected rear ground connection with the first end of described loud speaker, the sliding end of described first potentiometer is connected with the first end of described second electric capacity, second end of described second electric capacity is connected with the inverting input of described second amplifier, described second amplifier out is connected with the first end of described 4th electric capacity and the first end of described 3rd electric capacity respectively, second end of described 4th electric capacity is connected with the second end of described 3rd resistance, described second end of the 3rd electric capacity is connected with the second end of described loud speaker, the in-phase input end of described 3rd amplifier is connected with the second end of described 5th resistance, the inverting input of described 3rd amplifier is connected with the second end of described second potentiometer and the first end of described 6th resistance respectively, second end of described 6th resistance is connected with the first end of described 5th electric capacity, second end of described 5th electric capacity is the signal input part of described audio frequency amplifier.
Beneficial effect of the present invention is:
The present invention is a kind of audio frequency amplifier for computer sound box, in this audio frequency amplifier, the first amplifier, the first electric capacity, the second resistance, the first potentiometer and the second electric capacity composition buffer compartment is from amplifier circuit, this buffer compartment can intercept the fluctuation of signal on final amplifier from amplifier circuit and cause influence of fluctuations to pre-amplifier, and the load capacity of chopped-off head amplifier signal can be improved, this audio frequency amplifier also has the feature that structure is simple and power consumption is low.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of a kind of audio frequency amplifier 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 amplifier for computer sound box of the present invention, comprise power supply, push-button switch S, first resistance R1 is to the 6th resistance R6, first amplifier IC1 is to the 3rd amplifier IC3, first electric capacity C1 is to the 5th electric capacity C5, first potentiometer RP1, second potentiometer RP2 and loud speaker, the positive pole of power supply is connected with the first end of push-button switch S, second end of push-button switch S is connected with the first end of the first resistance R1 and the cathode power supply end of the second amplifier IC2 respectively, second end of the first resistance R1 is connected with the cathode power supply end of the first amplifier IC1, the inverting input of the first amplifier IC1 respectively with the first end of the 4th resistance R4, the output of the 3rd amplifier IC3, the first end of the second potentiometer RP2 is connected with the sliding end of the second potentiometer RP2, the in-phase input end of the first amplifier IC1 is connected with the output of the first amplifier IC1 and the first end of the first electric capacity C1 respectively, second end of the first electric capacity C1 is connected with the first end of the second resistance R2, second end of the second resistance R2 is connected with the first end of the first potentiometer RP1, second end of the first potentiometer RP1 respectively with second end of the 4th resistance R4, the in-phase input end of the second amplifier IC2, the negative electricity source of the 3rd amplifier IC3, the negative electricity source of the second amplifier IC2, the first end of the 5th resistance R5, the first end of the 3rd resistance R3 is connected rear ground connection with the first end of loud speaker BR, the sliding end of the first potentiometer RP1 is connected with the first end of the second electric capacity C2, second end of the second electric capacity C2 is connected with the inverting input of the second amplifier IC2, second amplifier IC2 output is connected with the first end of the 4th electric capacity C4 and the first end of the 3rd electric capacity C3 respectively, second end of the 4th electric capacity C4 is connected with second end of the 3rd resistance R3, second end of the 3rd electric capacity C3 is connected with second end of loud speaker BR, the in-phase input end of the 3rd amplifier IC3 is connected with second end of the 5th resistance R5, the inverting input of the 3rd amplifier IC3 is connected with second end of the second potentiometer RP2 and the first end of the 6th resistance R6 respectively, second end of the 6th resistance R6 is connected with the first end of the 5th electric capacity C5, second end of the 5th electric capacity C5 is the signal input part Vi of audio frequency amplifier.
Operation principle of the present invention is as follows:
Audio signal enters the 3rd amplifier IC3, after faint signal is amplified, enter by the first amplifier IC1, first electric capacity C1, second resistance R2, first potentiometer RP1 and the second electric capacity C2 forms buffer compartment from amplifier circuit, from amplifier circuit, this buffer compartment has the advantages that input impedance is high and output impedance is low, therefore improve the signal load ability of the 3rd amplifier IC3, intercept the fluctuation of signal on the second amplifier IC2 to the impact of signal on the first amplifier IC1, after second amplifier IC2 amplifies audio signal, be coupled on the 3rd electric capacity C3, promote loud speaker BR, sound.
Claims (1)
1. the audio frequency amplifier for computer sound box, it is characterized in that: comprise power supply, push-button switch, first resistance is to the 6th resistance, first amplifier is to the 3rd amplifier, first electric capacity is to the 5th electric capacity, first potentiometer, second potentiometer and loud speaker, the positive pole of described power supply is connected with the first end of described push-button switch, second end of described push-button switch is connected with the first end of described first resistance and the cathode power supply end of described second amplifier respectively, second end of described first resistance is connected with the cathode power supply end of described first amplifier, the inverting input of described first amplifier respectively with the first end of described 4th resistance, the output of described 3rd amplifier, the first end of described second potentiometer is connected with the sliding end of described second potentiometer, the in-phase input end of described first amplifier is connected with the output of described first amplifier and the first end of described first electric capacity respectively, second end of described first electric capacity is connected with the first end of described second resistance, second end of described second resistance is connected with the first end of described first potentiometer, second end of described first potentiometer respectively with the second end of described 4th resistance, the in-phase input end of described second amplifier, the negative electricity source of described 3rd amplifier, the negative electricity source of described second amplifier, the first end of described 5th resistance, the first end of described 3rd resistance is connected rear ground connection with the first end of described loud speaker, the sliding end of described first potentiometer is connected with the first end of described second electric capacity, second end of described second electric capacity is connected with the inverting input of described second amplifier, described second amplifier out is connected with the first end of described 4th electric capacity and the first end of described 3rd electric capacity respectively, second end of described 4th electric capacity is connected with the second end of described 3rd resistance, described second end of the 3rd electric capacity is connected with the second end of described loud speaker, the in-phase input end of described 3rd amplifier is connected with the second end of described 5th resistance, the inverting input of described 3rd amplifier is connected with the second end of described second potentiometer and the first end of described 6th resistance respectively, second end of described 6th resistance is connected with the first end of described 5th electric capacity, second end of described 5th electric capacity is the signal input part of described audio frequency amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310612138.2A CN104682892A (en) | 2013-11-27 | 2013-11-27 | Audio frequency amplifier used for computer speakers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310612138.2A CN104682892A (en) | 2013-11-27 | 2013-11-27 | Audio frequency amplifier used for computer speakers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104682892A true CN104682892A (en) | 2015-06-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310612138.2A Pending CN104682892A (en) | 2013-11-27 | 2013-11-27 | Audio frequency amplifier used for computer speakers |
Country Status (1)
| Country | Link |
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| CN (1) | CN104682892A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105376676A (en) * | 2015-11-24 | 2016-03-02 | 宁波柏人艾电子有限公司 | A loudspeaker box echo processing circuit |
| CN105376678A (en) * | 2015-11-24 | 2016-03-02 | 宁波柏人艾电子有限公司 | An audio adjusting circuit |
| CN107104642A (en) * | 2017-04-05 | 2017-08-29 | 成都市宏山科技有限公司 | A kind of circuit structure for being used to amplify audio signal |
-
2013
- 2013-11-27 CN CN201310612138.2A patent/CN104682892A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105376676A (en) * | 2015-11-24 | 2016-03-02 | 宁波柏人艾电子有限公司 | A loudspeaker box echo processing circuit |
| CN105376678A (en) * | 2015-11-24 | 2016-03-02 | 宁波柏人艾电子有限公司 | An audio adjusting circuit |
| CN107104642A (en) * | 2017-04-05 | 2017-08-29 | 成都市宏山科技有限公司 | A kind of circuit structure for being used to amplify audio signal |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150603 |