CN209435412U - A kind of audio signal source automatic switchover output circuit - Google Patents
A kind of audio signal source automatic switchover output circuit Download PDFInfo
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- CN209435412U CN209435412U CN201920545095.3U CN201920545095U CN209435412U CN 209435412 U CN209435412 U CN 209435412U CN 201920545095 U CN201920545095 U CN 201920545095U CN 209435412 U CN209435412 U CN 209435412U
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Abstract
The utility model discloses a kind of audio signal sources to automatically switch output circuit, including the first input circuit with background music input interface, the second input circuit with microphone signal input interface and the switching output circuit for automatically selecting between the first input circuit and the second input circuit output；Power supply VCC is respectively the first input circuit, the second input circuit, switching output circuit power supply；The input terminal of switching output circuit is connect with the output end of the first input circuit, the second input circuit respectively；The output end for switching output circuit is used for connecting sound equipment playback equipment；First input circuit, the second input circuit of the utility model can be respectively as background musics, the input terminal of microphone signal, sound background music automatically when realizing microphone without input by switching output circuit, background music is automatically stopped when microphone has input, meets the use demand of people；Circuit structure is simplified, and installation is easy to make, has preferable promotion prospect.
Description
Technical field
The utility model relates to automatically switch output to Audio conversion technical field more particularly to a kind of audio signal source
Circuit.
Background technique
Background music is needed to replace sounding with microphone mostly in occasions such as broadcast system, stage scenes, this plays that and stops, both
It can be realized the warm field effect of background music, and the home court for not influencing microphone uses, but lack the prior art at present and come in fact
Existing this function, to needing occasion to be used to bring inconvenience, therefore, the prior art is defective, needs to improve.
Utility model content
The utility model provides a kind of audio signal source automatic switchover output circuit, the above problem of solution.
To solve the above problems, the technical scheme that the utility model is provided is as follows:
A kind of audio signal source automatic switchover output circuit, including the first input electricity with background music input interface
It road, the second input circuit with microphone signal input interface and is selected automatically between the first input circuit and the second input circuit
Select the switching output circuit of output；Power supply VCC is respectively the first input circuit, the second input circuit, switching output circuit power supply；
The input terminal of switching output circuit is connect with the output end of the first input circuit, the second input circuit respectively；Switch output circuit
Output end be used for connecting sound equipment playback equipment.
Beneficial effect compared with the existing technology is, using the above scheme, first input circuit of the utility model, second
Input circuit can realize microphone without input respectively as background music, the input terminal of microphone signal by switching output circuit
Shi Zidong sounds background music, and background music is automatically stopped when microphone has input, meets the use demand of people；Circuit structure
It simplifies, installation is easy to make, has preferable promotion prospect.
Detailed description of the invention
Illustrate embodiment or technical solution in the prior art in order to clearer, it below will be to embodiment or the prior art
The required attached drawing used is briefly described in description, it is clear that, the accompanying drawings in the following description is only the one of utility model
A little embodiments for those of ordinary skill in the art without creative efforts, can also be according to these
Attached drawing obtains other attached drawings.
Fig. 1 is that a kind of audio signal source of the utility model automatically switches the circuit diagram of output circuit.
Specific embodiment
For the ease of understanding the utility model, in the following with reference to the drawings and specific embodiments, the utility model is carried out more detailed
Thin explanation.The preferred embodiment of the utility model is given in attached drawing.But the utility model can be with many different
Form is realized, however it is not limited to this specification described embodiment.On the contrary, purpose of providing these embodiments is makes to this
The understanding of the disclosure of utility model is more thorough and comprehensive.
It should be noted that it can directly on the other element when element is referred to as " being fixed on " another element
Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it, which can be, is directly connected to
To another element or it may be simultaneously present centering elements.Term used in this specification " fixation ", " integrated molding ",
For illustrative purposes only, the similar unit of structure is to identical label in the figure for "left", "right" and similar statement
Mark.
Unless otherwise defined, technical and scientific term all used in this specification and the skill for belonging to the utility model
The normally understood meaning of the technical staff in art field is identical.Art used in the description of the utility model in this specification
Language, which is only for the purpose of describing specific embodiments, is not intended to limitation the utility model.
As shown in Figure 1, one embodiment of the utility model is:
A kind of audio signal source automatic switchover output circuit, including the first input electricity with background music input interface
It road, the second input circuit with microphone signal input interface and is selected automatically between the first input circuit and the second input circuit
Select the switching output circuit of output；Power supply VCC is respectively the first input circuit, the second input circuit, switching output circuit power supply；
The input terminal of switching output circuit is connect with the output end of the first input circuit, the second input circuit respectively；Switch output circuit
Output end be used for connecting sound equipment playback equipment.
First input circuit includes resistance R1-R2, R5-R6, capacitor C1 and triode VT1；
Power supply VCC is connect with the collector of the first end of resistance R1, triode VT1 respectively；The of background music signal source
One end is connect with the first end of capacitor C1；The second end of capacitor C1 respectively with the second end of resistance R1, the first end of resistance R5, three
The base stage of pole pipe VT1 connects；The emitter of triode VT1 is connect with the first end of resistance R2, R6 respectively；Background music signal source
Second end, the second end of resistance R5-R6 is grounded；
Power supply VCC is DC12V DC power supply；Triode VT1 is 9014 type NPN transistors.
Second input circuit includes resistance R9-R18, capacitor C4-C6 and triode VT4-VT6；
The first end of resistance R1 is connect with the first end of the first end of resistance R15, R16, R18, capacitor C5 respectively；Resistance
The second end of R15 is connect with the collector of the second end of resistance R14, the base stage of triode VT4, triode VT5 respectively；Triode
The emitter of VT4 is connect with the first end of the first end of capacitor C4, resistance R10 respectively；The second end of capacitor C4 is with resistance R9's
First end connection；The first end of resistance R17 is connect with the second end of the second end of resistance R16, capacitor C5 respectively；Resistance R17's
Second end is connect with the emitter of triode VT6；The collector of triode VT6 respectively with the first end of resistance R12, triode
The base stage of VT5 connects；The emitter of triode VT5 is connect with the first end of resistance R11；The second end of resistance R18 respectively with electricity
Hold the first end of C6, the base stage of triode VT6, the connection of the first end of resistance R13；The of the second end of capacitor C6 and microphone signal
One end connection；The second end of microphone signal is grounded；The second end of resistance R9-R13 is grounded；
Triode VT6 is 9012 type PNP transistors；Triode VT4-VT5 is 9013 type NPN transistors.
Switching output circuit includes resistance R3-R4, R7-R8, capacitor C2-C3, C8, diode VD1, triode VT2-VT3
With potentiometer RP；
The second end of resistance R2 is connect with the first end of resistance R3-R4 respectively；The of the second end of resistance R3 and capacitor C2
One end connection；The second end of capacitor C2 is connect with the base stage of the first end of resistance R14, triode VT3 respectively；The first of resistance R1
End is connect with the collector of triode VT3-VT4 respectively；The second end of resistance R4 is connect with the collector of triode VT2；Three poles
The base stage of pipe VT2 is connect with the cathode of the first end of capacitor C3, diode VD1 respectively；The anode of diode VD1 is with resistance R8's
First end connection；The second end of resistance R8 is connect with the first end of resistance R9；The emitter of triode VT3 is respectively with resistance R7's
First end, the connection of the first end of capacitor C8；The second end of capacitor C8 is connect with the first end of potentiometer RP；The sliding of potentiometer RP
It holds and is connect with the first end of mixing output；Mix second end, the second end of resistance R7, the second end of capacitor C3, three poles of output
The emitter of pipe VT2 is grounded；
Capacitor C3 is for adjusting the switching delay time；Triode VT2-VT3 is 9013 type NPN transistors.
Resistance is common four chromatic circle resistance of 1/4W；Capacitor is the electrolytic capacitor of pressure-resistant 16V；Except VT6 is positive-negative-positive pipe
Outside 9012, remaining triode is NPN type 9014.
Working principle of the utility model is:
When no microphone signal, background music is by transporting to rear class recording circuit from RP centre cap after VT1, VT3 amplification.When
When having microphone signal, which is coupled to VD1 by C4 after being amplified by VT6, VT5, VT4 and carries out rectification one DC control electricity of generation
Pressure, the voltage are connected VT2, decay to background music level；And after microphone signal is then amplified by VT6, VT5, from VT5's
The pole C is mixed through background music of the R14 after decaying amplifies through VT3 again, exports from RP centre cap.After microphone signal disappears,
VT2 base bias disappears and ends, and restores background music.
Since the charge circuit time constant of C3 is smaller (VD1 is connected when charging), microphone signal has just started to make
Background music weakens, to protrude microphone signal.And C3 discharge loop time constant is larger (VD1 ends when electric discharge), so when words
After cylinder signal stops a period of time, background music just recovers, and when preventing speech from pausing, background music restores.Change C3 electricity
Capacity, the time of adjustable delay.
It should be noted that above-mentioned each technical characteristic continues to be combined with each other, the various embodiments not being enumerated above are formed,
It is accordingly to be regarded as the range of the utility model specification record；Also, it for those of ordinary skills, can be according to above stating
It is bright to be improved or converted, and all these modifications and variations all should belong to the protection model of the appended claims for the utility model
It encloses.
Claims (10)
1. a kind of audio signal source automatically switches output circuit, which is characterized in that including the with background music input interface
One input circuit, the second input circuit with microphone signal input interface and the first input circuit and the second input circuit it
Between automatically select the switching output circuit of output；Power supply VCC is respectively the first input circuit, the second input circuit, switching output
Circuit power supply；The input terminal of switching output circuit is connect with the output end of the first input circuit, the second input circuit respectively；Switching
The output end of output circuit is used for connecting sound equipment playback equipment.
2. a kind of audio signal source according to claim 1 automatically switches output circuit, which is characterized in that the first input electricity
Road includes resistance R1-R2, R5-R6, capacitor C1 and triode VT1.
3. a kind of audio signal source according to claim 2 automatically switches output circuit, which is characterized in that power supply VCC points
It is not connect with the collector of the first end of resistance R1, triode VT1；The first end of background music signal source and the first of capacitor C1
End connection；The second end of capacitor C1 is connect with the base stage of the second end of resistance R1, the first end of resistance R5, triode VT1 respectively；
The emitter of triode VT1 is connect with the first end of resistance R2, R6 respectively；The second end of background music signal source, resistance R5-R6
Second end be grounded.
4. a kind of audio signal source automatic switchover output circuit according to claim 2 or 3, which is characterized in that power supply
VCC is DC12V DC power supply；Triode VT1 is 9014 type NPN transistors.
5. a kind of audio signal source according to claim 1 automatically switches output circuit, which is characterized in that the second input electricity
Road includes resistance R9-R18, capacitor C4-C6 and triode VT4-VT6.
6. a kind of audio signal source according to claim 5 automatically switches output circuit, which is characterized in that the of resistance R1
One end is connect with the first end of the first end of resistance R15, R16, R18, capacitor C5 respectively；The second end of resistance R15 respectively with electricity
Hinder the collector connection of the second end of R14, the base stage of triode VT4, triode VT5；The emitter of triode VT4 respectively with electricity
Hold first end, the connection of the first end of resistance R10 of C4；The second end of capacitor C4 is connect with the first end of resistance R9；Resistance R17's
First end is connect with the second end of the second end of resistance R16, capacitor C5 respectively；The second end of resistance R17 and the hair of triode VT6
Emitter-base bandgap grading connection；The collector of triode VT6 is connect with the base stage of the first end of resistance R12, triode VT5 respectively；Triode VT5
Emitter connect with the first end of resistance R11；The second end of resistance R18 respectively with the first end of capacitor C6, triode VT6
Base stage, the connection of the first end of resistance R13；The second end of capacitor C6 and the first end of microphone signal connect；The second of microphone signal
End ground connection；The second end of resistance R9-R13 is grounded.
7. a kind of audio signal source automatic switchover output circuit according to claim 5 or 6, which is characterized in that three poles
Pipe VT6 is 9012 type PNP transistors；Triode VT4-VT5 is 9013 type NPN transistors.
8. a kind of audio signal source according to claim 1 automatically switches output circuit, which is characterized in that switching output electricity
Road includes resistance R3-R4, R7-R8, capacitor C2-C3, C8, diode VD1, triode VT2-VT3 and potentiometer RP.
9. a kind of audio signal source according to claim 8 automatically switches output circuit, which is characterized in that the of resistance R2
Two ends are connect with the first end of resistance R3-R4 respectively；The second end of resistance R3 is connect with the first end of capacitor C2；The of capacitor C2
Two ends are connect with the base stage of the first end of resistance R14, triode VT3 respectively；The first end of resistance R1 respectively with triode VT3-
The collector of VT4 connects；The second end of resistance R4 is connect with the collector of triode VT2；The base stage of triode VT2 respectively with electricity
Hold the first end of C3, the cathode connection of diode VD1；The anode of diode VD1 is connect with the first end of resistance R8；Resistance R8's
Second end is connect with the first end of resistance R9；The emitter of triode VT3 respectively with the first end of resistance R7, capacitor C8 first
End connection；The second end of capacitor C8 is connect with the first end of potentiometer RP；The sliding end of potentiometer RP with mix output first
End connection；Mix output second end, the second end of resistance R7, the second end of capacitor C3, triode VT2 emitter connect
Ground.
10. a kind of audio signal source automatic switchover output circuit according to claim 8 or 9, which is characterized in that capacitor
C3 is for adjusting the switching delay time；Triode VT2-VT3 is 9013 type NPN transistors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920545095.3U CN209435412U (en) | 2019-04-22 | 2019-04-22 | A kind of audio signal source automatic switchover output circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920545095.3U CN209435412U (en) | 2019-04-22 | 2019-04-22 | A kind of audio signal source automatic switchover output circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209435412U true CN209435412U (en) | 2019-09-24 |
Family
ID=67979427
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920545095.3U Expired - Fee Related CN209435412U (en) | 2019-04-22 | 2019-04-22 | A kind of audio signal source automatic switchover output circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209435412U (en) |
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2019
- 2019-04-22 CN CN201920545095.3U patent/CN209435412U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
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| 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: 20190924 Termination date: 20200422 |