CN204697012U - A kind of active loundspeakers amplification control circuit - Google Patents
A kind of active loundspeakers amplification control circuit Download PDFInfo
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- CN204697012U CN204697012U CN201520343642.1U CN201520343642U CN204697012U CN 204697012 U CN204697012 U CN 204697012U CN 201520343642 U CN201520343642 U CN 201520343642U CN 204697012 U CN204697012 U CN 204697012U
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Abstract
The utility model provides a kind of active loundspeakers amplification control circuit, comprise: audio input interface, preamplifying circuit and audio power amplifying circuit, described audio input interface is connected with the input of preamplifying circuit, the output of described preamplifying circuit connects audio power amplifying circuit, the output of described audio power amplifying circuit connects loudspeaker, described audio power amplifying circuit comprises amplification controller, negative-feedback circuit, high tension protection circuit and decoupling circuit, described negative-feedback circuit, high tension protection circuit is connected with described amplification controller with decoupling circuit.The utility model improves the signal to noise ratio of system, keeps power good.
Description
Technical field
The utility model relates to a kind of sound equipment, is specifically related to a kind of active loundspeakers amplification control circuit.
Background technology
Sound equipment is well received by consumers as music player devices, at present, the known sound equipment of people mainly realizes its playing function by being connected with various audiogenic device, such as with VCD, MP3, computer connects, but this sound equipment generally adopts jack power supply to power to sound equipment, when sound equipment is connected with computer, need to carry out interface conversion, or adopt earphone interface to connect, existing sound equipment comprises sound control circuit, power amplification circuit and power circuit, sound control circuit is used for processing voice signal, power amplification circuit is used for carrying out power amplification to voice signal, power circuit is used for being that the operating voltage of system is powered by extraneous Power convert, the driving voltage of power amplification circuit and the supply power voltage of sound control circuit are comprised to the power supply of sound equipment, when the loudspeaker exported break down and export high pressure, can have an impact to power amplification circuit, serious meeting damages integrated circuit, affect the normal use of equipment.
Utility model content
In order to overcome above-mentioned prior art Problems existing, the utility model provides a kind of active loundspeakers amplification control circuit.
The technical scheme that the utility model is taked is: a kind of active loundspeakers amplification control circuit, it is characterized in that, comprise: audio input interface, preamplifying circuit and audio power amplifying circuit, described audio input interface is connected with the input of preamplifying circuit, the output of described preamplifying circuit connects audio power amplifying circuit, the output of described audio power amplifying circuit connects loudspeaker, described audio power amplifying circuit comprises amplification controller, negative-feedback circuit, high tension protection circuit and decoupling circuit, described negative-feedback circuit, high tension protection circuit is connected with described amplification controller with decoupling circuit, described negative-feedback circuit is made up of resistance R7 and resistance R8.
Further, described preamplifying circuit is made up of operational amplifier IC1, resistance R1, resistance R3, resistance R4, resistance R5 and electric capacity C2, described audio input interface is connected with one end of described input resistance R1, the negative input of the other end access operational amplifier IC1 of described resistance R1, the electrode input end ground connection of described operational amplifier IC1, arrange resistance R4 between the negative input of described operational amplifier IC1 and output, the output of described operational amplifier IC1 is connected with described audio power amplifying circuit with adjustable resistance VR1 by resistance R5.
Further, the input of described preamplifying circuit also arranges the Dolby circuit be made up of electric capacity C1 and resistance R2, and described electric capacity C1 is connected with the output of audio input interface with the one end after resistance R2 parallel connection, other end ground connection.
Further; described audio power amplifying circuit comprises amplification controller, negative-feedback circuit, high tension protection circuit and decoupling circuit; described negative-feedback circuit, high tension protection circuit are connected with described amplification controller with decoupling circuit, and described negative-feedback circuit is made up of resistance R7 and resistance R8.
Further, described negative-feedback circuit also arranges electric capacity C7, the positive pole of described electric capacity is connected with resistance R8, the minus earth of described electric capacity.Ensure that operational amplifier work is in by electric capacity C7 and exchange degenerative state.
Further; described high tension protection circuit comprises the first diode D1 and the second diode D2; the negative electrode of described first diode D1 is connected with the positive terminal of amplification controller IC2; the anode of described second diode D2 is connected with the negative pole end of amplification controller IC2, and the anode of described first diode D1 is connected with the output of amplification controller IC2 with the negative electrode of the second diode D2.
Further, described decoupling circuit comprises electric capacity C8 and electric capacity C9, and described electric capacity C8 is connected with the negative pole end of operational amplifier with one end after electric capacity C9 parallel connection, other end ground connection.
The beneficial effects of the utility model are: the utility model arranges Dolby circuit in preamplifying circuit; input impedance is limited; preamplifying circuit is avoided to be in high impedance status; alternating current impression signal is suppressed; the signal to noise ratio of raising system; by arranging high tension protection circuit; when loudspeaker break down and make output occur high tension voltage; first diode and the second diode pair operational amplifier play a protective role; and carry out power filter and decoupling by electric capacity C8 and electric capacity C9, keep power good further.
Accompanying drawing explanation
A kind of active loundspeakers amplification control circuit structure chart that Fig. 1 provides for the utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in detail.
See Fig. 1, it is a kind of active loundspeakers amplification control circuit structure chart that the utility model provides.
As shown in Figure 1, a kind of active loundspeakers amplification control circuit, it is characterized in that, comprise: audio input interface, preamplifying circuit and audio power amplifying circuit, described audio input interface is connected with the input of preamplifying circuit, the output of described preamplifying circuit connects audio power amplifying circuit, the output of described audio power amplifying circuit connects loudspeaker, described audio power amplifying circuit comprises amplification controller, negative-feedback circuit, high tension protection circuit and decoupling circuit, described negative-feedback circuit, high tension protection circuit is connected with described amplification controller with decoupling circuit, described negative-feedback circuit is made up of resistance R7 and resistance R8.
Further, described preamplifying circuit is made up of operational amplifier IC1, resistance R1, resistance R3, resistance R4, resistance R5 and electric capacity C2, described audio input interface is connected with one end of described input resistance R1, the negative input of the other end access operational amplifier IC1 of described resistance R1, the electrode input end ground connection of described operational amplifier IC1, arrange resistance R4 between the negative input of described operational amplifier IC1 and output, the output of described operational amplifier IC1 is connected with described audio power amplifying circuit with adjustable resistance VR1 by resistance R5.
Further, the input of described preamplifying circuit also arranges the Dolby circuit be made up of electric capacity C1 and resistance R2, and described electric capacity C1 is connected with the output of audio input interface with the one end after resistance R2 parallel connection, other end ground connection.
In the utility model embodiment, when sound equipment is closed, audio input interface is unsettled, is in high impedance input state, and the ac signal of now prime induction is delivered to late-class circuit and amplified, loudspeaker are made to occur stronger noise, by arranging Dolby circuit, input impedance being limited, avoiding preamplifying circuit to be in high impedance status, alternating current impression signal is suppressed, improves the signal to noise ratio of system.
Further, described negative-feedback circuit also arranges electric capacity C7, the positive pole of described electric capacity is connected with resistance R8, the minus earth of described electric capacity.Ensure that operational amplifier work is in by electric capacity C7 and exchange degenerative state.
Further; described high tension protection circuit comprises the first diode D1 and the second diode D2; the negative electrode of described first diode D1 is connected with the positive terminal of amplification controller IC2; the anode of described second diode D2 is connected with the negative pole end of amplification controller IC2, and the anode of described first diode D1 is connected with the output of amplification controller IC2 with the negative electrode of the second diode D2.
In the utility model embodiment, when loudspeaker break down and make output occur high tension voltage, the first diode and the second diode pair operational amplifier play a protective role.
Further, described decoupling circuit comprises electric capacity C8 and electric capacity C9, and described electric capacity C8 is connected with the negative pole end of operational amplifier with one end after electric capacity C9 parallel connection, other end ground connection.
In the utility model embodiment, the capacitance of electric capacity C8 is the value of 100 μ F, electric capacity C9 is 0.1 μ F, is used for power filter and decoupling, to keep power good further by electric capacity C8 and electric capacity C9.
Above the utility model is described in detail, but the utility model is not limited to above-mentioned execution mode, in the ken that those of ordinary skill in the art possess, can also makes a variety of changes under the prerequisite not departing from the utility model aim.Do not depart from design of the present utility model and scope can make many other and change and remodeling.Should be appreciated that the utility model is not limited to specific execution mode, scope of the present utility model is defined by the following claims.
Claims (6)
1. an active loundspeakers amplification control circuit, it is characterized in that, comprise: audio input interface, preamplifying circuit and audio power amplifying circuit, described audio input interface is connected with the input of preamplifying circuit, the output of described preamplifying circuit connects audio power amplifying circuit, the output of described audio power amplifying circuit connects loudspeaker, described audio power amplifying circuit comprises amplification controller, negative-feedback circuit, high tension protection circuit and decoupling circuit, described negative-feedback circuit, high tension protection circuit is connected with described amplification controller with decoupling circuit, described negative-feedback circuit is made up of resistance R7 and resistance R8.
2. a kind of active loundspeakers amplification control circuit according to claim 1, it is characterized in that, described preamplifying circuit is by operational amplifier IC1, resistance R1, resistance R3, resistance R4, resistance R5 and electric capacity C2 forms, described audio input interface is connected with one end of described input resistance R1, the negative input of the other end access operational amplifier IC1 of described resistance R1, the electrode input end ground connection of described operational amplifier IC1, between the negative input of described operational amplifier IC1 and output, resistance R4 is set, the output of described operational amplifier IC1 is connected with described audio power amplifying circuit with adjustable resistance VR1 by resistance R5.
3. a kind of active loundspeakers amplification control circuit according to claim 1, it is characterized in that, the input of described preamplifying circuit also arranges the Dolby circuit be made up of electric capacity C1 and resistance R2, described electric capacity C1 is connected with the output of audio input interface with the one end after resistance R2 parallel connection, other end ground connection.
4. a kind of active loundspeakers amplification control circuit according to claim 1, is characterized in that, described negative-feedback circuit also arranges electric capacity C7, and the positive pole of described electric capacity C7 is connected with resistance R8, the minus earth of described electric capacity C7.
5. a kind of active loundspeakers amplification control circuit according to claim 1; it is characterized in that; described high tension protection circuit comprises the first diode D1 and the second diode D2; the negative electrode of described first diode D1 is connected with the positive terminal of amplification controller IC2; the anode of described second diode D2 is connected with the negative pole end of amplification controller IC2, and the anode of described first diode D1 is connected with the output of amplification controller IC2 with the negative electrode of the second diode D2.
6. a kind of active loundspeakers amplification control circuit according to claim 1, is characterized in that, described decoupling circuit comprises electric capacity C8 and electric capacity C9, and described electric capacity C8 is connected with the negative pole end of operational amplifier with one end after electric capacity C9 parallel connection, other end ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520343642.1U CN204697012U (en) | 2015-05-25 | 2015-05-25 | A kind of active loundspeakers amplification control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520343642.1U CN204697012U (en) | 2015-05-25 | 2015-05-25 | A kind of active loundspeakers amplification control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204697012U true CN204697012U (en) | 2015-10-07 |
Family
ID=54237261
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520343642.1U Active CN204697012U (en) | 2015-05-25 | 2015-05-25 | A kind of active loundspeakers amplification control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204697012U (en) |
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2015
- 2015-05-25 CN CN201520343642.1U patent/CN204697012U/en active Active
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