CN207166749U - A kind of audio gain circuit - Google Patents
A kind of audio gain circuit Download PDFInfo
- Publication number
- CN207166749U CN207166749U CN201720988529.8U CN201720988529U CN207166749U CN 207166749 U CN207166749 U CN 207166749U CN 201720988529 U CN201720988529 U CN 201720988529U CN 207166749 U CN207166749 U CN 207166749U
- Authority
- CN
- China
- Prior art keywords
- resistance
- audio
- electrically connected
- triode
- semiconductor
- 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.)
- Active
Links
Landscapes
- Amplifiers (AREA)
- Control Of Amplification And Gain Control (AREA)
Abstract
The utility model discloses a kind of audio gain circuit, including audio input end, low-frequency gain module, high-frequency gain module and audio output, audio input end is used for input audio signal；Low-frequency gain module is electrically connected with audio input end for strengthening the low frequency part of audio signal；High-frequency gain module is electrically connected with audio input end for strengthening the HFS of audio signal；Audio output is electrically connected with low-frequency gain module, high-frequency gain module for exporting the audio signal after gain process respectively.The design carries out gain process to the HFS and low frequency part of audio, makes the fuller solid of tonequality of the audio signal of output, and tonequality is improved, and makes people's body and mind happy.
Description
Technical field
Electronic applications are the utility model is related to, particularly one kind is used for the stereosonic audio gain circuit of liquid crystal TV set.
Background technology
Present television set is switched to LCD TV comprehensively via traditional CRT TVs, the more does the more thin in appearance, image quality is got over
It is more clear to come, and main flow large scale screen resolution reaches 4K, however, when we play television channel or film using LCD TV
When, tonequality output is thin, and tonequality is not so good as old-fashioned CRT television sets, can not heard after volume is heightened, but high and low frequency
Tonequality is not obviously improved still.
Utility model content
In order to solve the above technical problems, the purpose of this utility model, which is to provide one kind, is used for the stereosonic sound of liquid crystal TV set
Frequency gain circuitry.
The technical solution adopted in the utility model is：
A kind of audio gain circuit, including audio input end, for input audio signal；
Low-frequency gain module, it is electrically connected with audio input end for strengthening the low frequency part of audio signal；
High-frequency gain module, it is electrically connected with audio input end for strengthening the HFS of audio signal；
Audio output, it is electrically connected with low-frequency gain module, high-frequency gain module passes through gain for output respectively
Audio signal after processing.
The low-frequency gain module includes triode Q11, triode Q21, resistance R41, resistance R51, resistance R61, resistance
R71 and electric capacity C3, the triode Q11 ground level are electrically connected with audio input end, triode Q11 colelctor electrode and three poles
Pipe Q21 ground level is electrically connected with, and triode Q11 emitter stage is electrically connected with resistance R61, resistance R71 successively, triode Q11
Emitter stage also successively with resistance R41, resistance R51, triode Q21 colelctor electrode, audio output be electrically connected with, the electric capacity
C3 is connected in parallel with resistance R41.
The utility model also includes first switch module, and the first switch module includes the controls of metal-oxide-semiconductor Q4 and first
Signal input part, one end of metal-oxide-semiconductor Q4 source class and electric capacity C3 are electrically connected with, and metal-oxide-semiconductor Q4 drain electrode is another with electric capacity C3's
End is electrically connected with, and metal-oxide-semiconductor Q4 grid and the first control signal input are electrically connected with.
The high-frequency gain module includes triode Q12, triode Q22, resistance R42, resistance R52, resistance R62, resistance
R72 and electric capacity C4, the triode Q12 ground level are electrically connected with audio input end, triode Q12 colelctor electrode and three poles
Pipe Q22 ground level is electrically connected with, and triode Q12 emitter stage is electrically connected with resistance R62, resistance R72 successively, triode Q12
Emitter stage also successively with resistance R42, resistance R52, triode Q22 colelctor electrode, audio output be electrically connected with, the electric capacity
C4 is connected in parallel with resistance R72.
The utility model also includes second switch module, and the second switch module includes the controls of metal-oxide-semiconductor Q3 and second
Signal input part, metal-oxide-semiconductor Q3 drain are electrically connected with electric capacity C4 one end, metal-oxide-semiconductor Q3 source class and resistance R72 one end
It is electrically connected with, metal-oxide-semiconductor Q3 grid and the second control signal input are electrically connected with.
The utility model also includes audio power amplification module, and the audio power amplification module and audio output are electrical
Connection exports for driving load.
The beneficial effects of the utility model：
The utility model is additionally arranged low-frequency gain module and high-frequency gain module in voicefrequency circuit, to the high frequency of audio
Part and low frequency part carry out gain process, make the fuller solid of tonequality of the audio signal of output, and tonequality is improved,
Make people's body and mind happy.
Brief description of the drawings
Specific embodiment of the present utility model is described further below in conjunction with the accompanying drawings.
Fig. 1 is circuit theory diagrams of the present utility model.
Fig. 2 is the simulated response schematic diagram of the utility model low-frequency gain module.
Fig. 3 is the simulated response schematic diagram of the utility model high-frequency gain module.
Fig. 4 is the simulated response schematic diagram of the utility model low-frequency gain module and high-frequency gain module.
Embodiment
As shown in figure 1, a kind of audio gain circuit, including audio input end 1, low-frequency gain module, high-frequency gain module
And audio output 2, audio input end 1 are used for the audio signal inputted in liquid crystal TV set SOC；Low-frequency gain module and sound
Frequency input terminal 1 is electrically connected with for strengthening the low frequency part of audio signal；High-frequency gain module electrically connects with audio input end 1
Connect for strengthening the HFS of audio signal；Audio output 2 is electrical with low-frequency gain module, high-frequency gain module respectively
Connect for exporting the audio signal after gain process.The design increases to the HFS and low frequency part of audio
Benefit is managed, and makes the fuller solid of tonequality of the audio signal of output, and tonequality is improved, and makes people's body and mind happy.
The low-frequency gain module includes triode Q11, triode Q21, resistance R41, resistance R51, resistance R61, resistance
R71 and electric capacity C3, the triode Q11 ground level and audio input end 1 are electrically connected with, triode Q11 colelctor electrode and three
Pole pipe Q21 ground level is electrically connected with, and triode Q11 emitter stage is electrically connected with resistance R61, resistance R71 successively, triode
Q11 emitter stage is also electrically connected with resistance R41, resistance R51, triode Q21 colelctor electrode, audio output 2 successively, described
Electric capacity C3 is connected in parallel with resistance R41.
The utility model also includes first switch module 3, and the first switch module 3 includes the controls of metal-oxide-semiconductor Q4 and first
Signal input part 31 processed, metal-oxide-semiconductor Q4 source class are electrically connected with electric capacity C3 one end, and metal-oxide-semiconductor Q4 drain electrode is with electric capacity C3's
The other end is electrically connected with, and metal-oxide-semiconductor Q4 grid is electrically connected with the first control signal input 31.First control signal input
31 send control signal to control metal-oxide-semiconductor Q4 on or off to metal-oxide-semiconductor Q4.When metal-oxide-semiconductor Q4 is turned on, low-frequency gain module
Without gain effect；When metal-oxide-semiconductor Q4 ends, low-frequency gain module has gain effect.
The high-frequency gain module includes triode Q12, triode Q22, resistance R42, resistance R52, resistance R62, resistance
R72 and electric capacity C4, the triode Q12 ground level and audio input end 1 are electrically connected with, triode Q12 colelctor electrode and three
Pole pipe Q22 ground level is electrically connected with, and triode Q12 emitter stage is electrically connected with resistance R62, resistance R72 successively, triode
Q12 emitter stage is also electrically connected with resistance R42, resistance R52, triode Q22 colelctor electrode, audio output 2 successively, described
Electric capacity C4 is connected in parallel with resistance R72.
The utility model also includes second switch module 4, and the second switch module 4 includes the controls of metal-oxide-semiconductor Q3 and second
Signal input part 41 processed, metal-oxide-semiconductor Q3 drain are electrically connected with electric capacity C4 one end, and metal-oxide-semiconductor Q3 source class is with resistance R72's
One end is electrically connected with, and metal-oxide-semiconductor Q3 grid is electrically connected with the second control signal input 41.Second control signal input 41
Control signal is sent to metal-oxide-semiconductor Q4 to control metal-oxide-semiconductor Q3 on or off.When metal-oxide-semiconductor Q3 is turned on, low-frequency gain module tool
There is gain effect；When metal-oxide-semiconductor Q3 ends, low-frequency gain module does not have gain effect.
In the present embodiment, resistance R41 and resistance R42 is that same resistance R4, resistance R51 and resistance R52 are same
Resistance R5；Resistance R61 and resistance R62 is same resistance R6；Resistance R71 and resistance R72 is same resistance R7；Triode
Q11 and triode Q12 is same triode Q1；Triode Q21 and triode Q22 is same triode Q2.
The utility model is mainly utilized in RC circuits, and the impedance of electric capacity realizes sound with the principle of the change change of frequency
The low frequency part of frequency, the gain of HFS.
The gain of low-frequency gain module：First control signal input 31 sends control signal control metal-oxide-semiconductor to metal-oxide-semiconductor Q4
Q4 ends, and the second control signal input 41 sends control signal control metal-oxide-semiconductor Q3 cut-offs to metal-oxide-semiconductor Q4, now in circuit
Voltage gain Av=(R6+R7+Zf)/R6+R7, wherein, Zf=(R4//j ω * C3)+R5 is electric capacity C3, resistance R4, resistance R5 institutes
In the total resistance of branch road, when incoming frequency is relatively low, electric capacity C3 impedance levels off to infinity, Zf=R4+R5；When input frequency
When rate is higher, electric capacity C3 impedance tends to 0, Zf=R5, and therefore, with the raising of incoming frequency, voltage gain Av numerical value is got over
It is low, it is inversely proportional.As shown in Fig. 2 in figure, abscissa is incoming frequency value, and ordinate is yield value, lower limiting frequency F0=1/ (2
π R4*C3), upper cut off frequency F1=(R4+R6+R7+R5)/{ 2 π C3*R4 (R6+R7+R5) }.In the present embodiment, voltage gain
Rise up to 12db.
The gain of high-frequency gain module：First control signal input 31 sends control signal control metal-oxide-semiconductor to metal-oxide-semiconductor Q4
Q4 is turned on, and the second control signal input 41 sends control signal control metal-oxide-semiconductor Q3 conductings to metal-oxide-semiconductor Q4, now in circuit
Voltage gain Av1=(Zs+R5)/Zs, wherein Zs=(1/j ω * C4//R7)+R6 is branch where electric capacity C4, resistance R6, resistance R7
The total resistance on road, when incoming frequency is relatively low, electric capacity C4 impedance levels off to infinity, Zs=R7+R6, when incoming frequency compared with
Gao Shi, electric capacity C4 impedance tend to 0, Zs=R6, and therefore, with the raising of incoming frequency, voltage gain Av1 numerical value is higher,
It is directly proportional.As shown in figure 3, in figure, abscissa is incoming frequency value, and ordinate is yield value, lower limiting frequency F2=(R7+R6+
R5)/{ 2 π R7*C4* (R6+R5) }, upper cut off frequency F3=(R7+R6)/(2 π * R7*C4*R6), in the present embodiment, voltage increase
The rise of benefit is up to 12db.
The gain simultaneously of low-frequency gain module, high-frequency gain module：First control signal input 31 sends to metal-oxide-semiconductor Q4 and controlled
Signal control metal-oxide-semiconductor Q4 cut-offs processed, the second control signal input 41 send control signal control metal-oxide-semiconductor Q3 to metal-oxide-semiconductor Q4 and led
Logical, gain situation is combined for gain, the gain of high-frequency gain module of above-mentioned low-frequency gain module, as shown in figure 4, in figure,
Abscissa is incoming frequency value, and ordinate is yield value, and the frequency characteristic of the voltage gain in low frequency and high-frequency range is simultaneously
Get a promotion.
The utility model also includes audio power amplification module, the audio power amplification module and the electricity of audio output 2
Property connection for driving load export.
The utility model on the negative-feedback circuit of triode Q1 and triode Q2 compositions with reference to resistance, electric capacity by making
With the gain of circuit can be made there is the separators such as frequency characteristic, all resistance of circuit devcie, electric capacity, metal-oxide-semiconductor, triode
Part, no integrated circuit and operational amplifier, cost is cheap, has the great market competitiveness.
Preferred embodiments of the present utility model are the foregoing is only, the utility model is not limited to above-mentioned embodiment party
Formula, if with essentially identical means realize the technical scheme of the utility model purpose belong to the scope of protection of the utility model it
It is interior.
Claims (6)
- A kind of 1. audio gain circuit, it is characterised in that including：Audio input end (1), for input audio signal；Low-frequency gain module, it is electrically connected with audio input end (1) for strengthening the low frequency part of audio signal；High-frequency gain module, it is electrically connected with audio input end (1) for strengthening the HFS of audio signal；Audio output (2), it is electrically connected with respectively with low-frequency gain module, high-frequency gain module for output by gain Audio signal after reason.
- A kind of 2. audio gain circuit according to claim 1, it is characterised in that：The low-frequency gain module includes three poles Pipe Q11, triode Q21, resistance R41, resistance R51, resistance R61, resistance R71 and electric capacity C3, the ground level of the triode Q11 It is electrically connected with audio input end (1), triode Q11 colelctor electrode is electrically connected with triode Q21 ground level, triode Q11 Emitter stage be electrically connected with successively with resistance R61, resistance R71, triode Q11 emitter stage also successively with resistance R41, resistance R51, triode Q21 colelctor electrode, audio output (2) are electrically connected with, and the electric capacity C3 and resistance R41 is connected in parallel.
- A kind of 3. audio gain circuit according to claim 2, it is characterised in that：Also include first switch module (3), institute Stating first switch module (3) includes metal-oxide-semiconductor Q4 and the first control signal input (31), the metal-oxide-semiconductor Q4 source class and electric capacity C3 one end is electrically connected with, and metal-oxide-semiconductor Q4 drain electrode is electrically connected with the electric capacity C3 other end, metal-oxide-semiconductor Q4 grid and the first control Signal input part (31) processed is electrically connected with.
- A kind of 4. audio gain circuit according to claim 1, it is characterised in that：The high-frequency gain module includes three poles Pipe Q12, triode Q22, resistance R42, resistance R52, resistance R62, resistance R72 and electric capacity C4, the ground level of the triode Q12 It is electrically connected with audio input end (1), triode Q12 colelctor electrode is electrically connected with triode Q22 ground level, triode Q12 Emitter stage be electrically connected with successively with resistance R62, resistance R72, triode Q12 emitter stage also successively with resistance R42, resistance R52, triode Q22 colelctor electrode, audio output (2) are electrically connected with, and the electric capacity C4 and resistance R72 is connected in parallel.
- A kind of 5. audio gain circuit according to claim 4, it is characterised in that：Also include second switch module (4), institute Stating second switch module (4) includes metal-oxide-semiconductor Q3 and the second control signal input (41), the metal-oxide-semiconductor Q3 drain and electric capacity C4 one end is electrically connected with, and metal-oxide-semiconductor Q3 source class is electrically connected with resistance R72 one end, metal-oxide-semiconductor Q3 grid and the second control Signal input part (41) is electrically connected with.
- A kind of 6. audio gain circuit according to claim 1, it is characterised in that：Also include audio power amplification module, The audio power amplification module is electrically connected with audio output (2) and exported for driving load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720988529.8U CN207166749U (en) | 2017-08-08 | 2017-08-08 | A kind of audio gain circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720988529.8U CN207166749U (en) | 2017-08-08 | 2017-08-08 | A kind of audio gain circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207166749U true CN207166749U (en) | 2018-03-30 |
Family
ID=61715704
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720988529.8U Active CN207166749U (en) | 2017-08-08 | 2017-08-08 | A kind of audio gain circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207166749U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107396242A (en) * | 2017-08-08 | 2017-11-24 | 广东长虹电子有限公司 | A kind of audio gain circuit |
-
2017
- 2017-08-08 CN CN201720988529.8U patent/CN207166749U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107396242A (en) * | 2017-08-08 | 2017-11-24 | 广东长虹电子有限公司 | A kind of audio gain circuit |
| CN107396242B (en) * | 2017-08-08 | 2024-02-06 | 广东长虹电子有限公司 | Audio gain circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109951161A (en) | A kind of complementary type digital variable gain amplifier | |
| WO2015139352A1 (en) | Current analog audio amplifier | |
| CN207166749U (en) | A kind of audio gain circuit | |
| CN102118668B (en) | Loudspeaker system and loudspeaker driving circuit | |
| CN105656473B (en) | A kind of drive circuit of the high amplitude of oscillation of high-speed suitable for silicon light modulators | |
| CN207354224U (en) | Power amplification circuit for speaker of voice box | |
| CN201365228Y (en) | Pure post power amplifier with high fidelity, high linearity and broad frequency band | |
| CN109728787A (en) | A kind of power amplifier | |
| CN107396242A (en) | A kind of audio gain circuit | |
| CN103259492A (en) | Video driver output amplifier circuit | |
| CN207720393U (en) | A kind of amplifier IC and electron tube mixed audio output circuit | |
| CN209608617U (en) | A kind of power amplifier | |
| CN208061666U (en) | A kind of voltage follow low distortion audio frequency broadcast system | |
| CN101557200B (en) | Power amplifier capable of regulating noise | |
| CN108010543B (en) | Voltage following low-distortion audio playing system | |
| CN205178994U (en) | Operational amplifier dynamic power circuit | |
| CN205039785U (en) | Portable instrument's power amplification circuit | |
| CN203151435U (en) | Audio input control and power amplification circuit | |
| CN205039780U (en) | Take dual power supply's dual track audio power amplifier circuit | |
| CN104283515A (en) | Power amplification circuit | |
| CN107888177A (en) | IC interior offset correction circuit | |
| CN104104345A (en) | Low-noise microphone input amplifier | |
| CN207625276U (en) | A kind of Voltag driving circuit and electronic equipment | |
| CN212970073U (en) | High-fidelity low-cost analog hearing aid circuit | |
| CN206251224U (en) | Amplifier circuit for sound frequency signal and television set |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |