CN204859493U - Adopt head circuit of discrete component equipment - Google Patents
Adopt head circuit of discrete component equipment Download PDFInfo
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- CN204859493U CN204859493U CN201520458977.8U CN201520458977U CN204859493U CN 204859493 U CN204859493 U CN 204859493U CN 201520458977 U CN201520458977 U CN 201520458977U CN 204859493 U CN204859493 U CN 204859493U
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Abstract
The utility model discloses an adopt head circuit of discrete component equipment, including the audio input circuit of connecting in order, earphone socket, headphone plug and earphone, wherein, the audio input circuit includes the audio input interface, and is first to the 5th resistance, first to third electric capacity, first to third transistor, controlling resistor and power. The utility model discloses an electromagnetic interference resistance head circuit board through position and the direction that rationally sets up the inductance, has reduced the electromagnetic interference of the alternating magnetic field of inductance production to loudspeaker magnet to the noise of loudspeaker has effectively been reduced, the utility model discloses an earphone through position and the direction that rationally sets up the inductance, has effectively reduced the noise of loudspeaker, has improved the quality of earphone, the utility model discloses an electromagnetic interference resistance method has reduced the noise of loudspeaker, has improved the quality of earphone.
Description
Technical field
The utility model discloses a kind of head circuit adopting discrete component to assemble, relate to voicefrequency circuit design field.
Background technology
Along with constantly popularizing of mobile terminal, the requirement of user to mobile terminal function is more and more higher.To listen to mobile phone, the mp3 of music by earphone, they use 3.5/2.5mm standard syllogic or four-section type headset socket mostly, and domestic formulated and start to perform make this earphone interface become China unified standard.Use earphone to listen to music or other programs, the detection of earphone just becomes particularly important.
In prior art, the method of headset detection is mostly used on the left channel signals line of earphone or right-channel signals line and draws the interrupt interface of signal to controller, and holding wire adds pull-up resistor R on left channel signals line or R channel, for right-channel signals line, when earphone does not insert, right-channel signals line remains high level; When earphone inserts, right-channel signals line is conducting to ground, and the voltage of right-channel signals line just pulled down to low level, thus generation interrupt signal is detected by MCU.
The shortcoming that above-mentioned detection method exists is exactly due to increasing a DC component in the audio signal of earphone, causes tonequality to decline; And the pull-up resistor be connected on sound channel signal line can cause a small amount of electric leakage, no matter whether there is earphone to insert the stand-by time that all can shorten mobile terminal.How can improve the tonequality of earphone, eliminate the electric leakage situation under earphone insert state, saving the electricity consumption under long-time use earphone state, is one of direction of ear phone technology area research.
Inductance, as a kind of electromagnetic conversion device, is normally placed in head circuit for supporting buck conversion chip or for power filter.Because the electric current on inductance has obvious fluctuation, therefore alternating magnetic field can be induced around.Due to the spatial limitation of earphone case, be arranged on head circuit plate in earphone case and loudspeaker can not from far.When the magnet on the inductance distance loudspeaker on head circuit plate is nearer, the alternating magnetic field produced in inductance will be radiated on magnet, causes interference, can produce audible noise after loudspeaker are disturbed, reduces headphone quality.
Summary of the invention
Technical problem to be solved in the utility model is: for the defect of prior art, provides a kind of head circuit adopting discrete component to assemble, and rationally arranges position and the direction of inductance, reduces the alternating magnetic field of inductance generation to the electromagnetic interference of loudspeaker magnet.
The utility model is for solving the problems of the technologies described above by the following technical solutions:
A kind of head circuit adopting discrete component to assemble, comprise the audio input circuit connected in turn, receiver J-Horner, headset plug and earphone, wherein, described audio input circuit comprises audio input interface, the first to the 5th resistance, first to the 3rd electric capacity, the first to third transistor, adjustable resistance and power supply;
One end of described audio input interface is connected with one end of the first resistance, one end of the second electric capacity respectively, and the other end of audio input interface is connected and ground connection with the emitter of the first transistor, the emitter of transistor seconds, the emitter of third transistor, the negative pole of power supply respectively, the other end of the first resistance respectively with one end of the first electric capacity, one end of adjustable resistance, one end of 3rd resistance is connected, the other end of the second electric capacity respectively with one end of the second resistance, the base stage of the first transistor is connected, the collector electrode of the first transistor respectively with the other end of the second resistance, the other end of adjustable resistance is connected, the adjustable end of adjustable resistance after the 3rd electric capacity respectively with one end of the 4th resistance, the base stage of transistor seconds is connected, the other end of the 4th resistance respectively with one end of the 5th resistance, the collector electrode of transistor seconds, the base stage of third transistor is connected, the collector electrode of third transistor is connected with one end of receiver J-Horner, the other end of the 3rd resistance is connected with the other end of the 5th resistance, the positive pole of power supply, the other end of receiver J-Horner respectively.
As further preferred version of the present utility model, the described first to the 5th resistance is metal film resistor or the carbon film resistor of 1/8W.
As further preferred version of the present utility model, described adjustable resistance is mini zone carbon composition film potentiometer.
As further preferred version of the present utility model, described first electric capacity is microminiature aluminium electrolytic capacitor.
As further preferred version of the present utility model, second, third electric capacity described is monolithic capacitor.
As further preferred version of the present utility model, first, second transistor described is S9014 type silicon NPN transistor.
As further preferred version of the present utility model, described third transistor is S8050 type silicon NPN transistor.
As further preferred version of the present utility model, described receiver J-Horner is the dual-channel headphone jack of φ 3.5mm.
As further preferred version of the present utility model, described power supply is dry cell or rechargeable battery.
The utility model adopts above technical scheme compared with prior art, there is following technique effect: anti-electromagnetic interference head circuit plate of the present utility model, by rationally arranging position and the direction of inductance, reduce the alternating magnetic field of inductance generation to the electromagnetic interference of loudspeaker magnet, thus effectively reduce the noise of loudspeaker; Earphone of the present utility model, by rationally arranging position and the direction of inductance, effectively reducing the noise of loudspeaker, improve the quality of earphone; Anti-electromagnetic interference method of the present utility model reduces the noise of loudspeaker, improves the quality of earphone.
Accompanying drawing explanation
Fig. 1 is circuit structure connection diagram of the present utility model,
Wherein: R1 to R5 is respectively the first to the 5th resistance, C1 to C3 is respectively the first to the 3rd electric capacity, and V1 to V3 is respectively the first to third transistor, and RP is adjustable resistance, and BM is audio input interface, and XS is receiver J-Horner, and XP is headset plug, and BE is earphone.
Embodiment
Be described below in detail execution mode of the present utility model, the example of described execution mode is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the execution mode be described with reference to the drawings, only for explaining the utility model, and can not being interpreted as restriction of the present utility model.
Below in conjunction with accompanying drawing, the technical solution of the utility model is described in further detail:
Circuit structure connection diagram of the present utility model as shown in Figure 1, the head circuit of described employing discrete component assembling, comprise the audio input circuit connected in turn, receiver J-Horner, headset plug and earphone, wherein, described audio input circuit comprises audio input interface, first to the 5th resistance, the first to the 3rd electric capacity, the first to third transistor, adjustable resistance and power supply;
One end of described audio input interface is connected with one end of the first resistance, one end of the second electric capacity respectively, and the other end of audio input interface is connected and ground connection with the emitter of the first transistor, the emitter of transistor seconds, the emitter of third transistor, the negative pole of power supply respectively, the other end of the first resistance respectively with one end of the first electric capacity, one end of adjustable resistance, one end of 3rd resistance is connected, the other end of the second electric capacity respectively with one end of the second resistance, the base stage of the first transistor is connected, the collector electrode of the first transistor respectively with the other end of the second resistance, the other end of adjustable resistance is connected, the adjustable end of adjustable resistance after the 3rd electric capacity respectively with one end of the 4th resistance, the base stage of transistor seconds is connected, the other end of the 4th resistance respectively with one end of the 5th resistance, the collector electrode of transistor seconds, the base stage of third transistor is connected, the collector electrode of third transistor is connected with one end of receiver J-Horner, the other end of the 3rd resistance is connected with the other end of the 5th resistance, the positive pole of power supply, the other end of receiver J-Horner respectively.
In a specific embodiment of the present utility model, the described first to the 5th resistance is metal film resistor or the carbon film resistor of 1/8W; Described adjustable resistance is mini zone carbon composition film potentiometer; Described first electric capacity is microminiature aluminium electrolytic capacitor; Second, third electric capacity described is monolithic capacitor; First, second transistor described is S9014 type silicon NPN transistor; Described third transistor is S8050 type silicon NPN transistor; Described receiver J-Horner is the dual-channel headphone jack of φ 3.5mm; Described power supply is dry cell or rechargeable battery.
Power circuit is made up of battery GB, current-limiting resistor R3 and prime filtering capacitor Cl.Pickup amplifying circuit is made up of microphone BM, capacitor C2, resistor Rl, R2, potentiometer RP and transistor Vl, V2.Amplification output circuit is made up of capacitor C3, resistor R4, R5, transistor V2, V3, socket XS, plug XP and earphone BE.Battery GB provides 1.5V working power for complete machine.After BM converts the voice signal picked up to the signal of telecommunication, then amplify through Vl, V2 two-stage audio frequency and after V3 power amplification, restore sound by earphone BE.The resistance of adjustment RP, can change the size of volume.
Rl-R5 selects metal film resistor or the carbon film resistor of 1/8W.RP selects microminiature carbon composition film potentiometer.Cl selects microminiature aluminium electrolytic capacitor; C2 and C3 all selects monolithic capacitor.Vl and V2 all selects S9014 type silicon NPN transistor; V3 selects S8050 type silicon NPN transistor.BM selects micro high sensitivity electret microphone.XS selects the dual-channel headphone jack of φ 3.5mm.BE selects finished product 30 Ω dual-channel headphone.GB selects No. 7 batteries.
By reference to the accompanying drawings execution mode of the present utility model is explained in detail above, 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 make a variety of changes under the prerequisite not departing from the utility model aim.The above, it is only preferred embodiment of the present utility model, not any pro forma restriction is done to the utility model, although the utility model discloses as above with preferred embodiment, but and be not used to limit the utility model, any those skilled in the art, do not departing within the scope of technical solutions of the utility model, make a little change when the technology contents of above-mentioned announcement can be utilized or be modified to the Equivalent embodiments of equivalent variations, in every case be do not depart from technical solutions of the utility model content, according to technical spirit of the present utility model, within spirit of the present utility model and principle, to any simple amendment that above embodiment is done, equivalent replacement and improvement etc., within the protection range all still belonging to technical solutions of the utility model.
Claims (9)
1. the head circuit adopting discrete component to assemble, it is characterized in that: comprise the audio input circuit connected in turn, receiver J-Horner, headset plug and earphone, wherein, described audio input circuit comprises audio input interface, the first to the 5th resistance, first to the 3rd electric capacity, the first to third transistor, adjustable resistance and power supply;
One end of described audio input interface is connected with one end of the first resistance, one end of the second electric capacity respectively, and the other end of audio input interface is connected and ground connection with the emitter of the first transistor, the emitter of transistor seconds, the emitter of third transistor, the negative pole of power supply respectively, the other end of the first resistance respectively with one end of the first electric capacity, one end of adjustable resistance, one end of 3rd resistance is connected, the other end of the second electric capacity respectively with one end of the second resistance, the base stage of the first transistor is connected, the collector electrode of the first transistor respectively with the other end of the second resistance, the other end of adjustable resistance is connected, the adjustable end of adjustable resistance after the 3rd electric capacity respectively with one end of the 4th resistance, the base stage of transistor seconds is connected, the other end of the 4th resistance respectively with one end of the 5th resistance, the collector electrode of transistor seconds, the base stage of third transistor is connected, the collector electrode of third transistor is connected with one end of receiver J-Horner, the other end of the 3rd resistance is connected with the other end of the 5th resistance, the positive pole of power supply, the other end of receiver J-Horner respectively.
2. a kind of head circuit adopting discrete component to assemble as claimed in claim 1, is characterized in that: the described first to the 5th resistance is metal film resistor or the carbon film resistor of 1/8W.
3. a kind of head circuit adopting discrete component to assemble as claimed in claim 1, is characterized in that: described adjustable resistance is mini zone carbon composition film potentiometer.
4. a kind of head circuit adopting discrete component to assemble as claimed in claim 1, is characterized in that: described first electric capacity is microminiature aluminium electrolytic capacitor.
5. a kind of head circuit adopting discrete component to assemble as claimed in claim 1, is characterized in that: second, third electric capacity described is monolithic capacitor.
6. a kind of head circuit adopting discrete component to assemble as claimed in claim 1, is characterized in that: first, second transistor described is S9014 type silicon NPN transistor.
7. a kind of head circuit adopting discrete component to assemble as claimed in claim 1, is characterized in that: described third transistor is S8050 type silicon NPN transistor.
8. a kind of head circuit adopting discrete component to assemble as claimed in claim 1, is characterized in that: described receiver J-Horner is the dual-channel headphone jack of φ 3.5mm.
9. a kind of head circuit adopting discrete component to assemble as claimed in claim 1, is characterized in that: described power supply is dry cell or rechargeable battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520458977.8U CN204859493U (en) | 2015-06-30 | 2015-06-30 | Adopt head circuit of discrete component equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520458977.8U CN204859493U (en) | 2015-06-30 | 2015-06-30 | Adopt head circuit of discrete component equipment |
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| Publication Number | Publication Date |
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| CN204859493U true CN204859493U (en) | 2015-12-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520458977.8U Expired - Fee Related CN204859493U (en) | 2015-06-30 | 2015-06-30 | Adopt head circuit of discrete component equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104980847A (en) * | 2015-06-30 | 2015-10-14 | 傅明尧 | Earphone circuit assembled by discrete components |
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2015
- 2015-06-30 CN CN201520458977.8U patent/CN204859493U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104980847A (en) * | 2015-06-30 | 2015-10-14 | 傅明尧 | Earphone circuit assembled by discrete components |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151209 Termination date: 20170630 |
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| CF01 | Termination of patent right due to non-payment of annual fee |