CN207589130U - A kind of earphone power amplifier - Google Patents
A kind of earphone power amplifier Download PDFInfo
- Publication number
- CN207589130U CN207589130U CN201721892197.XU CN201721892197U CN207589130U CN 207589130 U CN207589130 U CN 207589130U CN 201721892197 U CN201721892197 U CN 201721892197U CN 207589130 U CN207589130 U CN 207589130U
- Authority
- CN
- China
- Prior art keywords
- comparator
- power amplifier
- earphone
- switch part
- range sensor
- 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.)
- Expired - Fee Related
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Abstract
The utility model discloses a kind of earphone power amplifiers, its key points of the technical solution are that including audio input interface and the range sensor being arranged on earphone, audio input interface is connected with power amplifier chips, power amplifier chips are connected with audio output interface, tuning potentiometer is connected between audio input interface and power amplifier chips, range sensor is connected with first comparator, first comparator is connected with first switch part, first switch part is in parallel with tuning potentiometer, the output valve of range sensor and preset value are compared the on or off to control first switch part by first comparator；When user covers earphone, range sensor detects the close of the palm of user, the output valve of range sensor is more than the preset value of first comparator, first comparator control first switch part conducting, by the short circuit of tuning potentiometer, so as to increase the volume of earphone broadcasting, user is enabled not hear the content in earphone more clearly.
Description
Technical field
The utility model is related to a kind of power amplifier, more specifically, it relates to a kind of earphone power amplifier.
Background technology
With popularizing for mobile phone, the music of mobile phone is also become better and better, and earphone is also no longer single ear type, is worn
The earphone of formula also increasingly receives everybody favor.
Earphone is during use, and when site environment is more noisy, user would generally cover earphone with more clearly
The content of earphone broadcasting is not heard, but there are still situations about not heard due to earpiece volume tune obtains smaller.
Utility model content
The purpose of this utility model is to provide a kind of earphone power amplifier, in the case that environment is more noisy at the scene,
User tunes up volume when covering earphone, the advantages of user is enabled not hear the content in earphone more clearly.
The above-mentioned technical purpose of the utility model technical scheme is that：A kind of earphone power amplifier electricity
Road, including audio input interface and the range sensor being arranged on earphone, the audio input interface is connected with power amplifier chips,
The power amplifier chips are connected with audio output interface, and tuning current potential is connected between the audio input interface and power amplifier chips
Device, the range sensor are connected with first comparator, and the first comparator is connected with first switch part, the first switch
Part is in parallel with tuning potentiometer, and the output valve of range sensor and preset value are compared to control the by the first comparator
The on or off of one switch member.
By using above-mentioned technical proposal, the resistance value being connected to by adjusting tuning potentiometer in circuit can adjust earphone and broadcast
The volume put, when covering earphone in user not hear the content of earphone broadcasting, range sensor detects the palm of user
It is close, the output valve of range sensor is more than the preset value of first comparator, first comparator control first switch part conducting,
By the short circuit of tuning potentiometer, so as to increase the volume of earphone broadcasting, user is enabled not hear the content in earphone more clearly, it is convenient
It is practical.
Preferably, the range sensor is connected with the second comparator, and second comparator is connected with second switch part,
The second switch part is in parallel with tuning potentiometer after connecting with a resistance, and second comparator is by the output of range sensor
Value is compared the on or off to control second switch part with preset value, and the preset value of the second comparator compares less than first
The preset value of device.
By using above-mentioned technical proposal, when user is not intended to volume tune to obtain too big, by palm and range sensor
The distance between control be located between first comparator and the preset value of the second comparator in the output valve for making range sensor, the
Two switch members are connected, and resistance is in parallel with tuning potentiometer so that total resistance decrease at this so that the volume increase that earphone plays
It is high.
Preferably, the quantity of second comparator is more than 1, the quantity of second switch part and the quantity one of the second comparator
It causes, each second switch part is in parallel with tuning potentiometer after connecting with a resistance, and the preset value of each second comparator is in rank
Ladder type is set.
By using above-mentioned technical proposal so that the control of the distance between palm and range sensor makes range sensor
Output valve be located between the preset value of the second different comparator of first comparator so that the resistance of different number and tuning electricity
Position device is in parallel, and resistance in parallel is more, and total resistance value at this is smaller, realizes and the multistage of volume is adjusted.
Preferably, it is consistent with the resistance value of the resistance of each second switch part series connection.
By using above-mentioned technical proposal so that the adjusting of volume is more smooth.
Preferably, the output terminal of the range sensor is connected with amplifying circuit.
By using above-mentioned technical proposal, the output for sensor of adjusting the distance is amplified, and improves accuracy of detection.
Preferably, the power amplifier chips are connected with power interface, and change piezoelectricity is connected between power interface and power amplifier chips
Road.
It by using above-mentioned technical proposal, is powered for power amplifier chips, improves the stability of power amplifier chips work.
Preferably, the power amplifier chips are TPA3110D2 chips, and the power interface is USB power connector.
By using above-mentioned technical proposal, USB power connector is convenient for users to carrying out power amplifier chips using mobile power
Power supply.
Preferably, the transforming circuit is connected with filter circuit.
By using above-mentioned technical proposal, the electric energy after transformation is filtered, improves power supply quality.
Preferably, the transforming circuit is connected with voltage stabilizing chip.
By using above-mentioned technical proposal, voltage stabilizing is carried out to the electric energy after transformation, improves power supply quality.
In conclusion the utility model has the advantages that：Environment is more noisy at the scene, and earphone broadcasting
When volume adjustment obtains smaller, user can be close toward earphone by hand, and adjustment the distance between palm and earphone can be to broadcast sound volumes
It is adjusted, user is enabled not hear the content in earphone more clearly, it is convenient and practical.
Description of the drawings
Fig. 1 is the functional block diagram of the present embodiment；
Fig. 2 is the peripheral circuit connection diagram of power amplifier chips in the present embodiment；
Fig. 3 is the circuit connecting relation schematic diagram of range sensor in the present embodiment.
Reference numeral：1st, audio input interface；2nd, range sensor；3rd, power amplifier chips；4th, audio output interface；5th, tuning
Potentiometer；6th, first comparator；7th, first switch part；8th, the second comparator；9th, second switch part；10th, amplifying circuit；11st, become
Volt circuit；12nd, USB power connector；13rd, filter circuit；14th, voltage stabilizing chip.
Specific embodiment
The utility model is described in further detail below in conjunction with attached drawing.
Specific examples below is only the explanation to the utility model, is not the limitation to the utility model, this
Field technology personnel can as needed make the present embodiment the modification of no creative contribution after this specification is read,
But as long as it is all protected in the right of following utility model by Patent Law.
A kind of earphone power amplifier, as depicted in figs. 1 and 2, including audio input interface 1, audio input interface 1 is connected with
Tuning potentiometer 5, audio input interface 1 are connected with power amplifier chips 3, and power amplifier chips 3 are connected with audio output interface 4, wherein work(
Chip 3 is put as TPA3110D2 chips, the peripheral circuit of TPA3110D2 chips is the prior art, and this will not be repeated here, power amplifier core
Piece 3 is connected with audio output interface 4, and earphone is played out with connection audio output interface 4, audio input interface 1 and power amplifier core
It is connected between piece 3 by tuning potentiometer 5, the resistance value being connected to by adjusting tuning potentiometer 5 in circuit can adjust earphone
The volume of broadcasting.
USB power connector 12 is further included, USB power connector 12 is connected with transforming circuit 11, and transforming circuit 11 is connected with filter
Wave circuit 13, filter circuit 13 are connected with voltage stabilizing chip 14, and voltage stabilizing chip 14 connects the feeder ear of power amplifier chips 3, and USB power source connects
For mouth 12 convenient for users to being powered using mobile power to power amplifier chips 3, transforming circuit 11 includes CS5171 chips, CS5171
The 5V supply voltages accessed through USB power connector 12 are upgraded to the voltage of 15V by chip, and filter circuit 13 is the electricity with power sources in parallel
Hold, filter circuit 13 is filtered the power supply after boosting, improves power supply quality, voltage stabilizing chip 14 is using linear voltage stabilization
78M12 cake cores provide steadily 12V power supplys for power amplifier chips 3, improve power supply quality.
With reference to Fig. 1 and Fig. 3, the range sensor 2 for being separately positioned on earphone both sides is further included, range sensor 2 is connected with
Amplifying circuit 10, the adjust the distance output of sensor 2 of amplifying circuit 10 are amplified, and improve accuracy of detection.
The output terminal of amplifying circuit 10 is connected with the electrode input end of first comparator 6, the anti-phase input of first comparator 6
End is connected with the movable end of potentiometer, and two fixing ends of potentiometer connect power supply and ground connection respectively, and power supply is by potentiometer
First comparator 6 provides preset value, the output valve of range sensor 2 after the amplification of amplifying circuit 10 in first comparator 6 into
Row compares, and when the output of range sensor 2 is more than the preset value of first comparator 6, first comparator 6 exports opening for high level
OFF signal.
The output terminal of first comparator 6 is connected with the base stage of first switch part 7, and first switch part 7 is three poles of NPN type
Pipe, the collector and emitter of first switch part 7 are connected across tuning potentiometer 5, cover earphone in user and broadcast with not hearing earphone
During the content put, range sensor 2 detects the close of the palm of user, and the output valve of range sensor 2 is more than the first ratio
Compared with the preset value of device 6, first comparator 6 controls first switch part 7 to be connected, and 5 short circuit of tuning potentiometer is broadcast so as to increase earphone
The volume put enables user not hear the content in earphone more clearly, convenient and practical.
The output terminal of amplifying circuit 10 connects the electrode input end there are two the second comparator 8, each second comparator 8
Negative input is connected with the movable end of potentiometer, and two fixing ends of potentiometer connect power supply and ground connection respectively, and power supply passes through
Potentiometer provides preset value for the second comparator 8.
The output valve of range sensor 2 is compared after the amplification of amplifying circuit 10 in the second comparator 8, is passed in distance
When the output of sensor 2 is more than the preset value of the second comparator 8, the switching signal of the second comparator 8 output high level, each second
The preset value of comparator 8 is than the preset value of first comparator 6.
The output terminal of each second comparator 8 is connected with the base stage of second switch part 9, and second switch part 9 is the three of NPN type
Pole pipe, the collector and emitter of each second switch part 9 are connected across tuning potentiometer 5, and volume tune is not intended in user
When obtaining too big, by the control of the distance between palm and range sensor 2 compared with the output valve for making range sensor 2 is located at first
Between the preset value of 6 and second comparator 8 of device, second switch part 9 is connected, and resistance is in parallel with tuning potentiometer 5 so that at this
Total resistance decrease so that the volume raising that earphone plays.
The preset value of each second comparator 8 is set in staged so that the control of the distance between palm and range sensor 2
System is between the output valve for making range sensor 2 is located at the preset value of the second different comparator 8 of first comparator 6 so that no
Resistance with quantity is in parallel with tuning potentiometer 5, and resistance in parallel is more, and total resistance value at this is smaller, realizes to the more of volume
Grade is adjusted, and consistent with the resistance value of the resistance of each second switch part 9 series connection so that the adjusting of volume is more smooth.
Specifically used process：Environment is more noisy at the scene, and the volume adjustment that earphone plays is when obtaining smaller, user
Can be close toward earphone by hand, adjustment the distance between palm and earphone can be adjusted broadcast sound volume, and user is enabled to become apparent from
The content in earphone is not heard on ground, and convenient and practical adjusting is more smooth.
Claims (9)
1. a kind of earphone power amplifier, it is characterized in that：Including audio input interface (1) and the range sensor being arranged on earphone
(2), the audio input interface (1) is connected with power amplifier chips (3), and the power amplifier chips (3) are connected with audio output interface
(4), tuning potentiometer (5), the range sensor (2) are connected between the audio input interface (1) and power amplifier chips (3)
Be connected with first comparator (6), the first comparator (6) is connected with first switch part (7), the first switch part (7) with
Tuning potentiometer (5) is in parallel, the first comparator (6) by the output valve of range sensor (2) and preset value be compared with
Control the on or off of first switch part (7).
2. a kind of earphone power amplifier according to claim 1, it is characterized in that：The range sensor (2) is connected with
Two comparators (8), second comparator (8) are connected with second switch part (9), the second switch part (9) and a resistance string
In parallel with tuning potentiometer (5) after connection, second comparator (8) carries out the output valve of range sensor (2) and preset value
Compare the on or off to control second switch part (9), the preset value of the second comparator (8) is less than first comparator (6)
Preset value.
3. a kind of earphone power amplifier according to claim 2, it is characterized in that：The quantity of second comparator (8) is big
In 1, the quantity of second switch part (9) is consistent with the quantity of the second comparator (8), each second switch part (9) with a resistance
In parallel with tuning potentiometer (5) after series connection, the preset value of each second comparator (8) is set in staged.
4. a kind of earphone power amplifier according to claim 3, it is characterized in that：It is gone here and there with each second switch part (9)
The resistance value of the resistance of connection is consistent.
5. a kind of earphone power amplifier according to claim 1, it is characterized in that：The output terminal of the range sensor (2)
It is connected with amplifying circuit (10).
6. a kind of earphone power amplifier according to claim 1, it is characterized in that：The power amplifier chips (3) are connected with power supply
Transforming circuit (11) is connected between interface, power interface and power amplifier chips (3).
7. a kind of earphone power amplifier according to claim 6, it is characterized in that：The power amplifier chips (3) are TPA3110D2
Chip, the power interface are USB power connector (12).
8. a kind of earphone power amplifier according to claim 7, it is characterized in that：The transforming circuit (11) is connected with filtering
Circuit (13).
9. a kind of earphone power amplifier according to claim 7, it is characterized in that：The transforming circuit (11) is connected with voltage stabilizing
Chip (14).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721892197.XU CN207589130U (en) | 2017-12-28 | 2017-12-28 | A kind of earphone power amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721892197.XU CN207589130U (en) | 2017-12-28 | 2017-12-28 | A kind of earphone power amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207589130U true CN207589130U (en) | 2018-07-06 |
Family
ID=62740413
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721892197.XU Expired - Fee Related CN207589130U (en) | 2017-12-28 | 2017-12-28 | A kind of earphone power amplifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207589130U (en) |
-
2017
- 2017-12-28 CN CN201721892197.XU patent/CN207589130U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180706 Termination date: 20201228 |