CN205793154U - Earphone drive circuit and electronic equipment - Google Patents

Earphone drive circuit and electronic equipment Download PDF

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Publication number
CN205793154U
CN205793154U CN201620449340.7U CN201620449340U CN205793154U CN 205793154 U CN205793154 U CN 205793154U CN 201620449340 U CN201620449340 U CN 201620449340U CN 205793154 U CN205793154 U CN 205793154U
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audion
resistance
input
audio
outfan
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CN201620449340.7U
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张乐
王安伟
刘国栋
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Shenzhen TCL New Technology Co Ltd
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Shenzhen TCL New Technology Co Ltd
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Abstract

The utility model discloses a kind of earphone drive circuit and electronic equipment, this earphone drive circuit is in the electronic equipment with audio chip, audio chip has audio frequency output pin, headset detection foot and quiet control foot, and this earphone drive circuit includes audio amplifier circuit, audio signal output end and mute circuit;The input of audio amplifier circuit is connected with the audio frequency output pin of audio chip, and the outfan of audio amplifier circuit is connected with audio signal output end;The headset detection foot of audio chip is connected with audio signal output end;The quiet control foot of audio chip is connected with the input of mute circuit, and the outfan of mute circuit is connected with the quiet end of audio amplifier circuit.The problem of produced noise when this utility model solves headset plugging, equipment power-on and power-off and audio signal input.

Description

Earphone drive circuit and electronic equipment
Technical field
This utility model relates to electronic device field, particularly relates to a kind of earphone drive circuit and electronic equipment.
Background technology
In the electronic equipments such as television set, earphone output is a function the most conventional.Generally this In equipment, export after the audio signal that equipment master chip exports being amplified generally by integrated transporting discharging To earphone jack, when inserting earphone, the most exportable audio signal to earphone, to drive earphone to work.
But, when headset plugging, equipment power-on and power-off, noise signal can be produced, this noise signal is same Can play out to earphone along with audio signal input, produce the sound of " puff ", it addition, audio signal Input also can cause noise, and these noises can have a strong impact on the output quality of audio signal.
Utility model content
Main purpose of the present utility model is to provide a kind of earphone drive circuit, it is intended to improve earpiece audio The quality of output.
For achieving the above object, this utility model provides a kind of earphone drive circuit, is used for having audio frequency core In the electronic equipment of sheet, described audio chip has audio frequency output pin, headset detection foot and quiet control foot, Described earphone drive circuit includes audio amplifier circuit, audio signal output end and mute circuit;Described sound Frequently the input of amplifying circuit is connected with the audio frequency output pin of described audio chip, described audio amplifier circuit Outfan be connected with described audio signal output end;The headset detection foot of described audio chip and described sound Frequently signal output part connects;The quiet control foot of described audio chip connects with the input of described mute circuit Connecing, the outfan of described mute circuit is connected with the quiet end of described audio amplifier circuit.
Preferably, described audio amplifier circuit is direct-coupling amplifying circuit.
Preferably, described direct-coupling amplifying circuit include input module, the first audion amplification module and Second audion amplification module, the input of described input module is the defeated of described direct-coupling amplifying circuit Entering end, the outfan of described input module is connected with the input of described first audion amplification module;Institute The input of the outfan and described second audion amplification module of stating the first audion amplification module is connected, The outfan that outfan is described direct-coupling amplifying circuit of described second audion amplification module.
Preferably, described input module includes the 3rd resistance, the first end of described 3rd resistance and described sound Frequently output pin connects, the input of the second end of described 3rd resistance and described first audion amplification module, The outfan interconnection of described mute circuit.
Preferably, described input module also includes the second electric capacity, and the first end of described second electric capacity is with described Second end of the 3rd resistance connects, the second end ground connection of described second electric capacity.
Preferably, the outfan of described first audion amplification module includes the first outfan and the second output End, the input of described second audion amplification module includes first input end and the second input;Described First audion amplification module includes the second audion, the 4th resistance, the 5th resistance, the 6th resistance and Seven resistance, the first end of described 4th resistance is the input of described first audion amplification module, and with The base stage of described second audion connects, and the second end of described 4th resistance is connected with power supply;Described second First outfan of the most described first audion amplification module of current collection of audion, described second audion Colelctor electrode be connected with the first end of described 5th resistance, and with the of described second audion amplification module One input connects, and the second end of described 5th resistance is connected with described power supply;Described second audion Emitter stage interconnects with the first end of described 6th resistance and the first end of described 7th resistance, described 6th electricity Second end ground connection of resistance, the second end of described 7th resistance is the second of described first audion amplification module Outfan, the second end of described 7th resistance connects with the second input of described second audion amplification module Connect.
Preferably, the outfan of described first audion amplification module includes the first outfan and the second output End, the input of described second audion amplification module includes first input end and the second input;Described Second audion amplification module includes that the 3rd audion and the 8th resistance, the base stage of described 3rd audion are The first input end of described second audion amplification module, the base stage and described first of described 3rd audion First outfan of audion amplification module connects;The emitter stage of described 3rd audion is connected with power supply; First end of described 8th resistance is the second input of described second audion amplification module, the described 8th First end of resistance and the second outfan of described first audion amplification module, described 3rd audion Colelctor electrode interconnects, and the second end of described 8th resistance is the outfan of described second audion amplification module, And be connected with described audio signal output end.
Preferably, described mute circuit includes the first audion, the first electric capacity, the first resistance, the second electricity Resistance, the input that the first end is described mute circuit of described first resistance, the second of described first resistance End interconnects with the first end of described first electric capacity and the first end of the second resistance, the second of described first electric capacity End is connected with described power supply, and the second end of described second resistance is connected with the base stage of described first audion; The outfan of the most described mute circuit of current collection of described first audion, the transmitting of described first audion Pole ground connection.
This utility model also provides for a kind of electronic equipment, including have audio frequency output pin, headset detection foot and The audio chip of quiet control foot and earphone drive circuit described above;The audio frequency output of described audio chip Foot is connected with the input of the audio amplifier circuit of described earphone drive circuit, the earphone of described audio chip Detection foot is connected with the audio signal output end of described earphone drive circuit;The quiet control of described audio chip Foot processed is connected with the input of the mute circuit of described earphone drive circuit, the outfan of described mute circuit It is connected with the quiet end of described audio amplifier circuit.
Preferably, described electronic equipment is television set.
Audio frequency output pin through audio chip, by arranging audio amplifier circuit, is exported by this utility model Audio signal exports after being amplified processing to audio signal output end, connects at audio signal output end and has During earphone, to drive earphone to work;Wherein, earphone and sound are detected when the headset detection foot of audio chip Frequently, when signal output part connects or disconnects, corresponding control signal pair is exported by quiet control foot Mute circuit is controlled, and makes earphone of short duration quiet, so, avoids headset plugging, equipment upper and lower The problem producing noise when electricity and audio signal input, thus improve the quality of earpiece audio output. Further, since employing mute circuit, additionally it is possible to avoid equipment power-on and power-off and audio signal input to produce Noise problem, therefore, further increases the quality of earpiece audio output.
Accompanying drawing explanation
Fig. 1 is the circuit structure block diagram of this utility model earphone drive circuit one embodiment;
Fig. 2 is the circuit structure block diagram of this utility model earphone another embodiment of drive circuit;
Fig. 3 is the electrical block diagram of the earphone drive circuit shown in Fig. 2.
Drawing reference numeral illustrates:
The realization of this utility model purpose, functional characteristics and advantage will in conjunction with the embodiments, do referring to the drawings into One step explanation.
Detailed description of the invention
Below in conjunction with the accompanying drawing in this utility model embodiment, to the technology in this utility model embodiment Scheme is clearly and completely described, it is clear that described embodiment is only of the present utility model one Section Example rather than whole embodiments.Based on the embodiment in this utility model, this area is general The every other embodiment that logical technical staff is obtained under not making creative work premise, broadly falls into The scope of this utility model protection.
It is to be appreciated that directional instruction in this utility model embodiment (such as upper and lower, left and right, It is forward and backward ...) it is only used for explanation phase under a certain particular pose (as shown in drawings) between each parts To position relationship, motion conditions etc., if this particular pose changes, then directionality indicates also Change the most therewith.
It addition, the description relating to " first ", " second " etc. in this utility model is only used for describing purpose, and It is not intended that indicate or imply its relative importance or the implicit number indicating indicated technical characteristic Amount.Thus, define " first ", the feature of " second " can express or implicitly include at least one should Feature.It addition, the technical scheme between each embodiment can be combined with each other, but must be with ability Based on territory those of ordinary skill is capable of, when the combination of technical scheme occurs conflicting or cannot be real Will be understood that the combination of this technical scheme does not exists now, the protection model not required at this utility model Within enclosing.
This utility model also provides for a kind of electronic equipment and a kind of earphone being applied in this electronic equipment drives Circuit.
This utility model electronic equipment can be the equipment that television set, mobile phone etc. have audio output function, ginseng According to Fig. 1, in one embodiment, this electronic equipment includes audio chip gill drive circuit, this audio frequency core Sheet has audio frequency output pin AIN, headset detection foot AD and quiet control foot MUTE.Wherein, audio frequency Chip is used for exporting audio signal by audio frequency output pin AIN;Headset detection foot AD is used for detecting audio frequency Whether signal output part AOUT has earphone to connect;Quiet control foot MUTE is for exporting audio chip Quiet control signal export to mute circuit 20, it is achieved the control to mute circuit 20.
With reference to Fig. 1, in one embodiment, this utility model earphone drive circuit includes audio amplifier circuit 10, audio signal output end AOUT and mute circuit 20;The input of described audio amplifier circuit 10 It is connected with the audio frequency output pin AIN of described audio chip, the outfan of described audio amplifier circuit 10 and institute State audio signal output end AOUT to connect;The headset detection foot AD of described audio chip and described audio frequency Signal output part AOUT connects, the quiet control foot MUTE of described audio chip and described mute circuit The input of 20 connects;The outfan of described mute circuit 20 is quiet with described audio amplifier circuit 10 End connects.
In the present embodiment, audio signal output end AOUT is preferably earphone jack, and audio chip passes through sound The audio signal of output pin AIN output frequently is first applied to audio amplifier circuit 10 and carries out at audio frequency amplification Reason, then exports to audio signal output end AOUT, connects at this audio signal output end AOUT and have During earphone, directly this audio signal is exported to earphone, to drive earphone to work.
When the headset detection foot AD of audio chip is detecting that audio signal output end AOUT does not connect During earphone, namely when earphone jack does not has earphone to insert, audio chip passes through its quiet control foot MUTE Output mute control signal, controls the sound that the audio frequency output pin AIN of audio chip is exported by mute circuit 20 Frequently signal carries out silence processing, cuts off its audio frequency output pin AIN and exports to audio signal output end AOUT Audio signal.
When headset detection foot AD is when detecting that audio signal output end AOUT connection has earphone, namely When earphone jack has earphone to insert, audio chip exports control signal by its quiet control foot MUTE, Making mute circuit 20 be failure to actuate, so, the audio signal output of audio frequency output pin AIN output is put to audio frequency Big circuit 10, audio amplifier circuit 10 exports to audio signal output end after amplified for audio signal process AOUT, then drives earphone sounding, so, while realizing driving earphone work, turn avoid slotting The noise problem produced when pulling out earphone, thus improve the output quality of earphone.
With reference to Fig. 2, in the present embodiment, above-mentioned audio amplifier circuit 10 can be that power supply complementary push-pull power is put The amplifying circuits such as big circuit, integrated chip amplifying circuit, direct-coupling amplifying circuit 110, these circuit Can realize being amplified to the audio signal that audio chip exports the requirement of earphone output.In the present embodiment Preferably employing direct-coupling amplifying circuit 110, direct-coupling amplifying circuit 110 does not use integrated transporting discharging chip, Circuit is simple, cost is relatively low.
In a preferred embodiment, with reference to Fig. 2 and Fig. 3, direct-coupling amplifying circuit 110 includes inputting mould Block the 111, first audion amplification module 112 and the second audion amplification module 113.
Specifically, the input of described input module 111 is the input of described direct-coupling amplifying circuit 110 End, the outfan of described input module 111 is connected with the input of described first audion amplification module 112; The outfan of described first audion amplification module 112 is defeated with described second audion amplification module 113 Entering end to connect, the outfan of described second audion amplification module 113 is described direct-coupling amplifying circuit The outfan of 110.
Wherein, described input module 111 includes the 3rd resistance R3, first end of described 3rd resistance R3 It is connected with described audio frequency output pin AIN, and first end of the 3rd resistance R3 is described input module 111 Input, the input of second end of described 3rd resistance R3 and described first audion amplification module 112 End, the outfan interconnection of described mute circuit 20, and second end of the 3rd resistance R3 be both described defeated Enter the outfan of module 111, be also the quiet end of described input module 111.
Further, input module 111 also includes the second electric capacity C2, first end of the second electric capacity C2 with Second end of described 3rd resistance R3 connects, the second end ground connection of described second electric capacity C2.
Specifically, second electric capacity C2 high-frequency noise in the audio signal filtering input, the most defeated Enter the audio input signal that signal is PWM mode, with boostfiltering effect, in other preferred embodiments, Second electric capacity C2 can also be other filter elements, is not construed as limiting herein.
Wherein, the first audion amplification module 112 is used for the audio signal received is carried out one-level amplification, Then exporting the second audion amplification module 113, the second audion amplification module 113 carries out two grades again and puts Big process, then exports to earphone, to drive earphone to work.It is understood that use common three Pole pipe amplification circuit structure is simple, relatively low compared to integrated transporting discharging chip cost.
In the present embodiment, it is preferable that the outfan of described first audion amplification module 112 includes first Outfan and the second outfan, the input of described second audion amplification module 113 includes the first input End and the second input;Described first audion amplification module 112 includes the second audion Q2, the 4th electricity Resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the first of described 4th resistance R4 End is the input of described first triode amplification module 112, and with the second audion Q2 described in described the Base stage connect, second end of described 4th resistance R4 is connected with described power supply VCC;Described 2nd 3 First outfan of the most described first audion amplification module 112 of current collection of pole pipe Q2, the described 2nd 3 The colelctor electrode of pole pipe Q2 is connected with first end of described 5th resistance R5, and puts with described second audion The first input end of big module 113 connects;Second end of described 5th resistance R5 and described power supply VCC Connect;The emitter stage of described second audion Q2 and first end and the described 7th of described 6th resistance R6 The first end interconnection of resistance R7, the second end ground connection of described 6th resistance R6, described 7th resistance R7 The second outfan that the second end is described first audion amplification module 112, described 7th resistance R7's Second end is connected with the second input of described second audion amplification module 113.
Specifically, the audio signal of audio chip output is through input module 111, to the second audion Q2's Base stage so that the second audion Q2 conducting, the second audion Q2 is in magnifying state, completes audio frequency The one-level of signal is amplified.
Wherein, described 4th resistance R4 is the pull-up resistor of the second audion Q2 colelctor electrode, is used for increasing institute State the driving force of earphone drive circuit;Described 4th resistance R4 also provides direct current inclined for the second audion Q2 Put, so that the voltage at the emitter stage two ends of the base stage of described second audion Q2 and described second audion Q2 It is maintained at a suitable scope, so that the second audion Q2 is operated in magnifying state.
Wherein, during the 5th resistance R5 is the second audion amplification module 113, the 3rd audion Q3 base stage is inclined Put resistance, for the Current amplifier of the second audion Q2 colelctor electrode is transformed into voltage amplification, the 5th resistance R5 also provides direct current biasing for the 3rd audion Q3 in the second audion amplification module 113 so that described the The base stage of three audion Q3 is maintained at a conjunction with the voltage at the emitter stage two ends of described 3rd audion Q3 Suitable scope, so that the 3rd audion Q3 is operated in magnifying state.Meanwhile, the 5th resistance R5 is also It is the first audion amplification module 112 and cooperation resistance of the second audion amplification module 113, chooses conjunction During the value fitted, the first audion amplification module 112 and the second audion amplification module 113 can be made to be in relatively Good amplification mated condition, reduces the distortion factor that audio signal is amplified.
Wherein, described 6th resistance R6 and the 7th resistance R7 is for determining the times magnification of described drive circuit Number, amplification approximates 1+R7/R6.Therefore, the resistance selecting suitable R7 and R6 is the most available Need the multiple amplified, thus can export in more weak electronic equipment for audio signal, improve Audio frequency exports load-carrying ability and compatibility.
In the present embodiment, it is preferable that the outfan of described first audion amplification module 112 includes first Outfan and the second outfan, the input of described second audion amplification module 113 includes the first input End and the second input;Second audion amplification module 113 includes the 3rd audion Q3, the 8th resistance R8, The base stage of described 3rd audion Q3 is the first input end of described second audion amplification module 113, institute First outfan of the base stage and described first audion amplification module 112 of stating the 3rd audion Q3 is connected; The emitter stage of described 3rd audion Q3 is connected with described power supply VCC;The of described 8th resistance R8 One end is the second input of described second audion amplification module 113, the first of described 8th resistance R8 End and the second outfan of described first audion amplification module 112, the current collection of described 3rd audion Q3 Pole interconnects, the outfan that the second end is the second audion amplification module 113 of described 8th resistance R8, and It is connected with described audio signal output end AOUT.Wherein, described 8th resistance R8 is protective resistance, The 3rd audion Q3 is burnt out during for preventing earphone short circuit.
Specifically, complete to export to the 3rd audion after one-level is amplified to audio signal as the second audion Q2 The base stage of Q3, the 3rd audion Q3 receives and turns on after audio signal, and is in magnifying state, through the After three audion Q3 processing and amplifying, then export to audio signal output end AOUT through the 8th resistance R8, Complete two grades of amplifications, thus realize the audio signal that audio chip is exported by direct-coupling amplifying circuit 110 It is amplified processing.
It should be noted that the direct-coupling amplifying circuit of this embodiment can be applied to audio signal output ratio In more weak electronic equipment, such as television set, this circuit can directly drive 32 Europe and above earphone Work, driving force is strong.
Based on above-described embodiment, in further carrying out example, with reference to Fig. 3, described mute circuit 20 wraps Include the first audion Q1, the first electric capacity C1, the first resistance R1, the second resistance R2, described first resistance First end of R1 is the input of described mute circuit 20, and second end of described first resistance R1 is with described First end of the first electric capacity C1 and the first end interconnection of the second resistance R2, the of described first electric capacity C1 Two ends are connected with power supply VCC, and second end of described second resistance R2 is with described first audion Q1's Base stage connects;The outfan of the most described mute circuit of current collection 20 of described first audion Q1, described The grounded emitter of the first audion Q1.
Wherein, the second resistance R2 is isolation resistance, and noise draws to be used for avoiding audio chip to occur when powering on Rise mute circuit 20 misoperation, and, the second resistance R2 also as the current-limiting resistance of the first audion Q1, The first audion Q1 is avoided to damage.
Wherein, the first resistance R1, the second resistance R2 and the first electric capacity C1 determine that the first audion Q1 satisfies With the time of conducting, make the first slow saturation conduction of audion Q1 to reduce electronic equipment machine and quiet Sound switchs the noise caused, and this avoid the noise caused when electronic equipment powers on.
In further carrying out example, described earphone drive circuit also includes the 3rd electric capacity C3, the described 3rd Electric capacity C3 is for filtering the clutter in power supply to reduce the clutter interference to described earphone drive circuit.
In order to of the present utility model thought is better described, in conjunction with above-mentioned all embodiments, below with TV As a example by machine, and combine Fig. 3 the physical circuit principle of this utility model preferred embodiment be described in detail:
When television set powers on, owing to the first electric capacity C1 is charged by power supply VCC, due to the first electric capacity The time-lag action of C1 so that the first audion Q1 slowly turns on and makes the base potential of the first audion Q1 draw Height, and make the first audion Q1 be in saturation conduction state, force the base potential of the second audion Q2 Being pulled low and end, such 3rd audion Q3 is also at cut-off state, therefore, and audio signal output end AOUT is output as low, and makes earphone of short duration quiet.Earphone is in mute state, this avoid electricity The noise problem caused when powering on depending on machine.
It should be noted that when the control signal of quiet control foot MUTE output is low level, first Audion Q1 is not turned on, the second audion Q2 and the 3rd audion Q3 normally, audio signal warp Second audion Q2 and the 3rd audion Q3 amplifies, output to audio signal output end AOUT, it is achieved The amplification of audio signal;When the control signal of quiet control foot MUTE output is high level, the one or three Pole pipe Q1 is in saturation conduction state, makes the base potential of the second audion Q2 be pulled low and end, sound Frequently signal output part AOUT is output as low, it is achieved quiet control.
After television set powers on, when the headset detection foot AD of audio chip is detecting audio signal output end When AOUT does not connect earphone, namely when earphone jack does not has earphone to insert, audio chip is quiet by it The quiet control signal of sound control foot MUTE output high level is through the first resistance R1 and the second resistance R2 extremely The base stage of the first audion Q1, due to the first resistance R1, the time-lag action of the second resistance R2 makes first Audion Q1 slowly turns on, and forces the base potential of the second audion Q2 to be pulled low and end, and such Three audion Q3 are also at cut-off state, and therefore, audio signal output end AOUT is output as low, And make earphone quiet, thus the audio signal realizing the output of the audio frequency output pin AIN to audio chip is carried out Silence processing, cuts off its audio frequency output pin AIN and exports the audio signal to audio signal output end AOUT.
When headset detection foot AD is when detecting that audio signal output end AOUT connection has earphone, namely When earphone jack has earphone to insert, audio chip is controlled by its quiet control foot MUTE output low level Signal, to the base stage of the first audion Q1, makes the first audion Q1 be in cut-off state, so that the two or three The base potential of pole pipe Q2 is that high level turns on, and such 3rd audion Q3 is also at conducting state, So, the audio signal output of audio frequency output pin AIN output amplifies electricity to audio amplifier circuit 10, audio frequency Road 10 exports after amplified for audio signal process to audio signal output end AOUT, then drives earphone Sounding, so, while realizing driving earphone work, the noise produced when turn avoid plug earphone Problem, thus improve the output quality of earphone.
Additionally, arrange a pull-up resistor at the quiet control foot MUTE of audio chip to connect power supply VCC, Can make audio chip during resetting, it is ensured that quiet control signal is output as high level, so that first The base stage of audion Q1 is that high potential makes the first audion Q1 be in saturation conduction state, forces second The current potential of the base stage of audion Q2 is pulled low and ends, thus cuts off its audio frequency output pin AIN and export extremely The audio signal of audio signal output end AOUT.So, it is to avoid television set or its audio chip fall The noise problem produced during electricity, thus improve the output quality of earphone.
To sum up, while realizing driving earphone normally to work, it also avoid television set power-on and power-off, earphone The noise problem that plug and mute circuit 20 self produce, thus improve the output quality of earphone.It addition, Use two-stage direct-current coupling amplifying circuit, simpler compared to circuit structure for integrated transporting discharging chip, And cost is lower.
It is understood that owing to employing above-mentioned earphone drive circuit in this utility model electronic equipment, Therefore, the embodiment of this electronic equipment includes whole technical sides of the above-mentioned whole embodiment of earphone drive circuit Case, and the technique effect reached is the most identical, does not repeats them here.
These are only preferred embodiment of the present utility model, not thereby limit patent model of the present utility model Enclose, every equivalent structure utilizing this utility model description and accompanying drawing content to be made or equivalence flow process conversion, Or directly or indirectly it is used in other relevant technical fields, the most in like manner it is included in patent of the present utility model In protection domain.

Claims (10)

1. an earphone drive circuit, in the electronic equipment with audio chip, described audio chip There is audio frequency output pin, headset detection foot and quiet control foot, it is characterised in that described earphone drives electricity Road includes audio amplifier circuit, audio signal output end and mute circuit;Described audio amplifier circuit defeated Entering end to be connected with the audio frequency output pin of described audio chip, the outfan of described audio amplifier circuit is with described Audio signal output end connects;The headset detection foot of described audio chip is with described audio signal output end even Connect;The quiet control foot of described audio chip is connected with the input of described mute circuit, described quiet electricity The outfan on road is connected with the quiet end of described audio amplifier circuit.
2. earphone drive circuit as claimed in claim 1, it is characterised in that described audio amplifier circuit For direct-coupling amplifying circuit.
3. earphone drive circuit as claimed in claim 2, it is characterised in that described direct-coupling amplifies Circuit includes input module, the first audion amplification module and the second audion amplification module, described input The input of module is the input of described direct-coupling amplifying circuit, the outfan of described input module with The input of described first audion amplification module connects, the outfan of described first audion amplification module It is connected with the input of described second audion amplification module, the output of described second audion amplification module End is the outfan of described direct-coupling amplifying circuit.
4. earphone drive circuit as claimed in claim 3, it is characterised in that described input module includes 3rd resistance, the first end of described 3rd resistance is connected with described audio frequency output pin, described 3rd resistance Second end and the input of described first audion amplification module, the outfan interconnection of described mute circuit.
5. earphone drive circuit as claimed in claim 4, it is characterised in that described input module also wraps Including the second electric capacity, the first end of described second electric capacity is connected with the second end of described 3rd resistance, and described Second end ground connection of two electric capacity.
6. earphone drive circuit as claimed in claim 3, it is characterised in that described first audion is put The outfan of big module includes the first outfan and the second outfan, described second audion amplification module Input includes first input end and the second input;Described first audion amplification module includes the two or three Pole pipe, the 4th resistance, the 5th resistance, the 6th resistance and the 7th resistance, the first end of described 4th resistance For the input of described first audion amplification module, and it is connected with the base stage of described second audion, institute The second end stating the 4th resistance is connected with power supply;The most described one or three pole of current collection of described second audion First outfan of pipe amplification module, the colelctor electrode of described second audion and the first of described 5th resistance End connects, and is connected with the first input end of described second audion amplification module, described 5th resistance Second end is connected with described power supply;The emitter stage of described second audion and the first end of described 6th resistance With the first end interconnection of described 7th resistance, the second end ground connection of described 6th resistance, described 7th resistance The second outfan that the second end is described first audion amplification module, the second end of described 7th resistance It is connected with the second input of described second audion amplification module.
7. earphone drive circuit as claimed in claim 3, it is characterised in that described first audion is put The outfan of big module includes the first outfan and the second outfan, described second audion amplification module Input includes first input end and the second input;Described second audion amplification module includes the three or three Pole pipe and the 8th resistance, the base stage of described 3rd audion is the first of described second audion amplification module Input, the base stage of described 3rd audion connects with the first outfan of described first audion amplification module Connect;The emitter stage of described 3rd audion is connected with power supply;First end of described 8th resistance is described Second input of two audion amplification modules, the first end of described 8th resistance and described first audion Second outfan of amplification module, the colelctor electrode interconnection of described 3rd audion, the of described 8th resistance Two ends are the outfan of described second audion amplification module, and are connected with described audio signal output end.
8. the earphone drive circuit as described in any one of claim 1 to 7, it is characterised in that described quiet Sound circuit includes the first audion, the first electric capacity, the first resistance, the second resistance, described first resistance First end is the input of described mute circuit, the second end of described first resistance and described first electric capacity First end and the first end interconnection of the second resistance, the second end of described first electric capacity is connected with power supply, described Second end of the second resistance is connected with the base stage of described first audion;The colelctor electrode of described first audion For the outfan of described mute circuit, the grounded emitter of described first audion.
9. an electronic equipment, it is characterised in that include having audio frequency output pin, headset detection foot and quiet The audio chip of sound control foot and the earphone drive circuit as described in claim 1 to 8 any one;Institute State the input of the audio frequency output pin of audio chip and the audio amplifier circuit of described earphone drive circuit even Connecing, the headset detection foot of described audio chip is connected with the audio signal output end of described earphone drive circuit, The quiet control foot of described audio chip is connected with the input of the mute circuit of described earphone drive circuit, The outfan of described mute circuit is connected with the quiet end of described audio amplifier circuit.
10. electronic equipment as claimed in claim 9, it is characterised in that described electronic equipment is TV Machine.
CN201620449340.7U 2016-05-17 2016-05-17 Earphone drive circuit and electronic equipment Active CN205793154U (en)

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Application Number Priority Date Filing Date Title
CN201620449340.7U CN205793154U (en) 2016-05-17 2016-05-17 Earphone drive circuit and electronic equipment

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Application Number Priority Date Filing Date Title
CN201620449340.7U CN205793154U (en) 2016-05-17 2016-05-17 Earphone drive circuit and electronic equipment

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106878872A (en) * 2017-04-14 2017-06-20 深圳创维-Rgb电子有限公司 A kind of peripheral circuit for eliminating noise signal
CN107371093A (en) * 2017-07-27 2017-11-21 广东长虹电子有限公司 A kind of audio amplifier circuit
CN107889025A (en) * 2017-11-28 2018-04-06 刘宏波 Audio signal conversion equipment and method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106878872A (en) * 2017-04-14 2017-06-20 深圳创维-Rgb电子有限公司 A kind of peripheral circuit for eliminating noise signal
CN106878872B (en) * 2017-04-14 2019-12-27 深圳创维-Rgb电子有限公司 Peripheral circuit for eliminating noise signal
CN107371093A (en) * 2017-07-27 2017-11-21 广东长虹电子有限公司 A kind of audio amplifier circuit
CN107889025A (en) * 2017-11-28 2018-04-06 刘宏波 Audio signal conversion equipment and method

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