CN208316995U - A kind of inside and outside microphone switching circuit - Google Patents
A kind of inside and outside microphone switching circuit Download PDFInfo
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- CN208316995U CN208316995U CN201821040795.9U CN201821040795U CN208316995U CN 208316995 U CN208316995 U CN 208316995U CN 201821040795 U CN201821040795 U CN 201821040795U CN 208316995 U CN208316995 U CN 208316995U
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Abstract
A kind of inside and outside microphone switching circuit, it is related to technical field of electronic equipment.It includes external microphone wind socket, microphone anode, microphone cathode, built-in microphone anode, built-in microphone cathode, control chip, external microphone wind socket is positive with microphone respectively, the connection of microphone cathode, built-in microphone anode is connect by switching switch with microphone anode, built-in microphone cathode is grounded after connecting with microphone cathode, control the 2 feet ground connection of chip, one end of 3 feet and first resistor that control chip connects, the other end of first resistor is connect with microphone anode, control chip 5 feet respectively with second resistance, it is grounded after capacitance connection, one end of 6 feet and 3rd resistor that control chip connects, the other end of 3rd resistor is connect with microphone anode.The mode that it improves the communication of conventional earphone voice increases the compatible design of external microphone wind other than the design of built-in microphone, makes communication more freely convenient, can be carried out secret language and chat.
Description
Technical field
The utility model relates to technical field of electronic equipment, and in particular to a kind of inside and outside microphone switching circuit.
Background technique
All only one built-in microphones such as traditional line control earphone, small earplug, headphone, traffic headset, are placed on line
On, about about 20-30 centimeters from the position of mouth, built-in microphone is inconvenient to adjust direction, because having one from mouth in use process
Set a distance, and allow user that must not have to hand in many occasions and hold line traffic control plate against microphone talk, voice is past when communication
It is inconvenient to use toward needing very loud or be placed near mouth with the device that an other hand holds line traffic control plate.
Utility model content
The purpose of this utility model is that in view of the drawbacks of the prior art and insufficient, a kind of inside and outside microphone is provided and is cut
Circuit is changed, it can solve only one built-in microphone of current earphone, so that linking up the inconvenient defect of call.
To achieve the above object, the utility model is using following technical scheme: it includes external microphone wind socket 1, wheat
Gram wind anode M+, microphone cathode G, built-in microphone anode M1, built-in microphone cathode M2, control chip U1, it is described external
Microphone jack 1 is connect with microphone anode M+, microphone cathode G respectively, and the built-in microphone anode M1 is opened by switching
It closes 2 to connect with microphone anode M+, built-in microphone cathode M2 is grounded after connecting with microphone cathode G, the control chip U1
2 feet ground connection, control chip U1 3 feet connect with one end of first resistor R7, the other end of the first resistor R7 and Mike
The M+ connection of wind anode, 5 feet of the control chip U1 are grounded after connecting respectively with second resistance R2, capacitor C2, the control core
6 feet of piece U1 are connect with one end of 3rd resistor R4, and the other end of the 3rd resistor R4 is connect with microphone anode M+.
Further, 1 foot of the control chip U1 connects with one end of the 4th resistance R5, volume decrease switches SW4 respectively
It connects, the other end of the 4th resistance R5 is connect with microphone anode M+, the other end ground connection of the volume decrease switches SW4.
Further, one end that 4 feet of the control chip U1 increase switch SW1 with the 5th resistance R6, volume respectively connects
It connects, the other end of the 5th resistance R6 is connect with microphone anode M+, and the volume increases the other end ground connection of switch SW1.
Further, it also includes control switch SW2, and the one end the control switch SW2 is connect with microphone anode M+, control
Make switch SW2 other end ground connection.
Further, the control chip U1 is the chip of SLH677 model.
After adopting the above technical scheme, the utility model has the beneficial effect that its structure is simple, design rationally, can be free
The inside and outside microphone of progress switching, the mode for improving voice communication increases other than the design of built-in microphone
The compatible design of external microphone wind can freely switch between built-in microphone and external microphone wind, allow and link up more certainly
By convenient, it can be carried out secret language and chat.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, before not making the creative labor property
It puts, is also possible to obtain other drawings based on these drawings.
Fig. 1 is the circuit diagram of the utility model.
Description of symbols: external microphone wind socket 1, switching switch 2.
Specific embodiment
Referring to shown in Fig. 1, present embodiment the technical solution adopted is that: it includes external microphone wind socket 1, Mike
Wind anode M+, microphone cathode G, built-in microphone anode M1, built-in microphone cathode M2, control chip U1, the external wheat
Gram wind socket 1 is connect with microphone anode M+, microphone cathode G respectively, and the built-in microphone anode M1 passes through switching switch 2
It being connect with microphone anode M+, built-in microphone cathode M2 is grounded after connecting with microphone cathode G, and the 2 of the control chip U1
3 feet of foot ground connection, control chip U1 are connect with one end of first resistor R7, and the other end and microphone of the first resistor R7 is just
Pole M+ connection, 5 feet of the control chip U1 are grounded after connecting respectively with second resistance R2, capacitor C2, the control chip U1
6 feet connect with one end of 3rd resistor R4, the other end of the 3rd resistor R4 is connect with microphone anode M+.
1 foot of the control chip U1 is connect with one end of the 4th resistance R5, volume decrease switches SW4 respectively, and described the
The other end of four resistance R5 is connect with microphone anode M+, the other end ground connection of the volume decrease switches SW4.
One end that 4 feet of the control chip U1 increase switch SW1 with the 5th resistance R6, volume respectively is connect, and described the
The other end of five resistance R6 is connect with microphone anode M+, and the volume increases the other end ground connection of switch SW1.
It also includes control switch SW2, and the one end the control switch SW2 is connect with microphone anode M+, control switch SW2
Other end ground connection.
The control chip U1 is the chip of SLH677 model.Automatically switch letter by the control chip of SLH677 model
Number, to realize the switching of built-in microphone and external microphone wind.
Working principle of the utility model is: the input of signal end has been compatible with two standards of national standard (OMTP) and American Standard (CTIA)
The input of signal source can connect mobile phone or the call of other communication equipments by controlling chip U1 automatic switching signal；When using outer
When microphone, it is inserted into the external microphone wind of 2.5mm or 3.5mm plug, is switched by 2.5mm or 3.5mm headphone plug base
Switch disconnects the signal of built-in microphone, and microphone anode M+ is connected to external microphone wind and (disconnects built-in microphone anode M1
Signal) to complete, microphone is inside and outside to set switching；When unpluging external microphone wind, signal free switching to built-in Mike
It is simple and convenient on wind.
The above is merely intended for describing the technical solutions of the present application, but not for limiting the present application, those of ordinary skill in the art couple
The other modifications or equivalent replacement that the technical solution of the utility model is made, without departing from technical solutions of the utility model
Spirit and scope should all cover in the scope of the claims of the utility model.
Claims (5)
1. a kind of inside and outside microphone switching circuit, it is characterised in that: it includes external microphone wind socket (1), microphone anode
M+, microphone cathode G, built-in microphone anode M1, built-in microphone cathode M2, control chip U1, the external microphone wind are inserted
Seat (1) connect respectively with microphone anode M+, microphone cathode G, the built-in microphone anode M1 by switching switch (2) and
The M+ connection of microphone anode, built-in microphone cathode M2 are grounded after connecting with microphone cathode G, 2 feet of the control chip U1
3 feet of ground connection, control chip U1 are connect with one end of first resistor R7, the other end and the microphone anode of the first resistor R7
M+ connection, 5 feet of the control chip U1 are grounded after connecting respectively with second resistance R2, capacitor C2, and the 6 of the control chip U1
Foot is connect with one end of 3rd resistor R4, and the other end of the 3rd resistor R4 is connect with microphone anode M+.
2. a kind of inside and outside microphone switching circuit according to claim 1, it is characterised in that: the control chip U1
1 foot connect respectively with one end of the 4th resistance R5, volume decrease switches SW4, the other end of the 4th resistance R5 and Mike
The M+ connection of wind anode, the other end ground connection of the volume decrease switches SW4.
3. a kind of inside and outside microphone switching circuit according to claim 1, it is characterised in that: the control chip U1
4 feet respectively with the 5th resistance R6, volume increase switch SW1 one end connect, the other end of the 5th resistance R6 and Mike
The M+ connection of wind anode, the volume increase the other end ground connection of switch SW1.
4. a kind of inside and outside microphone switching circuit according to claim 1, it is characterised in that: it also includes that control is opened
SW2 is closed, the one end the control switch SW2 is connect with microphone anode M+, control switch SW2 other end ground connection.
5. a kind of inside and outside microphone switching circuit according to claim 1, it is characterised in that: the control chip U1
For the chip of SLH677 model.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821040795.9U CN208316995U (en) | 2018-07-02 | 2018-07-02 | A kind of inside and outside microphone switching circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821040795.9U CN208316995U (en) | 2018-07-02 | 2018-07-02 | A kind of inside and outside microphone switching circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208316995U true CN208316995U (en) | 2019-01-01 |
Family
ID=64717417
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821040795.9U Active CN208316995U (en) | 2018-07-02 | 2018-07-02 | A kind of inside and outside microphone switching circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208316995U (en) |
-
2018
- 2018-07-02 CN CN201821040795.9U patent/CN208316995U/en active Active
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| GR01 | Patent grant |