CN207039876U - A kind of broadcast singal inputs automatic switch-over circuit - Google Patents
A kind of broadcast singal inputs automatic switch-over circuit Download PDFInfo
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- CN207039876U CN207039876U CN201720308975.XU CN201720308975U CN207039876U CN 207039876 U CN207039876 U CN 207039876U CN 201720308975 U CN201720308975 U CN 201720308975U CN 207039876 U CN207039876 U CN 207039876U
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Abstract
It the utility model is related to a kind of broadcast singal input automatic switch-over circuit, including broadcast signal input, local sound source input end, automatic switch-over circuit, audio output, the broadcast signal input is connected in parallel to resistance R1 and resistance R3, the other end of the resistance R3 is connected with audio output, the other end of the resistance R1 is connected with automatic switch-over circuit, and the local sound source input end is connected through electric capacity C1 and resistance R5 with audio output；Broadcast and local source of sound pass through same audio output, when there is broadcast singal input, automatically cut off local source of sound input, and broadcast is switched to export, it is automatic to play broadcast sounds, automatic switchback local source of sound after being discharged Deng broadcast, broadcast system is without individually matching somebody with somebody audio amplifier, it can be used using existing Wireless amplification audio amplifier, wiring flow is enormously simplify, so as to reduce the workload of staff, not only further saves resource, teacher's teaching is also convenient for simultaneously, and whole-process automatic realization is intervened without teacher.
Description
Technical field
A kind of teaching aid technical field is the utility model is related to, especially a kind of broadcast singal input is automatically switched electric
Road.
Background technology
With the development of educational undertaking, the enrollment scale of school constantly expands, and the number of students is continuously increased, teaching
Also improve therewith Deng hardware facility, still, its improvement is often very unbecoming with the development scale of school.One school should configure
Campus Broadcasting System, Linking All Classes teaching sound system is configured again, and two systems are independent operating, it is incompatible, use
It is extremely inconvenient, therefore, how to improve the management of teaching under existence conditions and quality has become the problem of people urgently pay close attention to.
With the dramatic change of Modern Teaching Mode, multimedia teaching becomes increasingly popular.Multimedia teaching refers to computer
Technology is core, uses aided education side of the medium techniques such as sound, image, magic lantern, animation, video display short-movie for Teaching Service
Formula, it is the integrated application to Multiform Teaching Medias such as electronic teaching, computer-assisted instructions.
Multimedia education system has turned into the essential presentation tool of information interchange.Teaching Technology of Multimedia enters class
Hall, just with its integration, controlling, diversification, variation, lively, colourful academic environment is provided for student.
It, which has, breaks through space-time, increase scope, expands the characteristics of capacity, adds the intuitive, iconicity, vividness of the content of courses；
Directly perceived, vivid, efficient teaching means is provided for teacher, is also the study of student, intelligence culture, Quality strengthening provided
Effect approach.
But multimedia education system can not be compatible with Campus Broadcasting System, it is impossible to provides eye exercises, rings a bell, promptly leads to
Know, listening, the access function such as campus radio station can not accomplish real Linking All Classes,
Existing many schools are also provided with broadcast system simultaneously by installing teaching Wireless amplification audio amplifier, and often covering system will
With independent audio amplifier, two systems exist simultaneously, the phenomenon of waste of resource be present, while also bring influence to product use, first
Two systems were installed in classroom simultaneously before this, influence it is attractive in appearance also cause to connect up in a mess, check extremely difficult during failure, installation is also time-consuming
Arduously, during use there is also influencing each other, for example classroom plays instructional video, and now broadcast system also plays simultaneously, knot
Fruit is in a mess, and teaching sound is not heard, and broadcast is not heard yet, the content of courses often now played with suspending manually, etc.
Broadcast discharge after start to impart knowledge to students again, brought to teachers ' teaching and for inconvenience.
The content of the invention
In view of the shortcomings of the prior art, the utility model provides a kind of broadcast singal input automatic switch-over circuit, wide when having
When broadcasting signal, local source of sound can be cut off, automatically switch input broadcast singal.
The technical solution of the utility model is：A kind of broadcast singal inputs automatic switch-over circuit, including broadcast singal input
End, local sound source input end, automatic switch-over circuit, audio output, the broadcast signal input are connected in parallel to resistance R1
With resistance R3, the other end of the resistance R3 is connected with audio output, the other end and automatic switch-over circuit of the resistance R1
Connection, the local sound source input end are connected through electric capacity C1 and resistance R5 with audio output, the local sound source input end warp
Electric capacity C1 is connected with automatic switch-over circuit；
The automatic switch-over circuit includes diode D1, D2, triode Q1, Q2, Q3, resistance R2, R7, R8, R9, electrolysis electricity
Hold C2, C3, the positive pole of the diode D1 is connected with resistance R1, the diode D1 negative poles through resistance R7 and electrochemical capacitor C2 and
Triode Q1 B poles (base stage) connection, described electrochemical capacitor C2 and resistance R7 are connected in parallel, resistance R7 one end and electrolysis electricity
The positive pole for holding C2 is connected, and the resistance R7 other end is grounded after being connected with electrochemical capacitor C2 negative pole；
E poles (emitter stage) ground connection of the triode Q1；The C poles (colelctor electrode) of the triode Q1 and triode Q2 B
Pole (base stage) is connected, and triode Q2 E poles ground connection, the C poles (colelctor electrode) of the triode Q2 are connected with resistance R2 one end, institute
State resistance R2 another termination+5V voltages, the positive pole of the C poles (colelctor electrode) of the triode Q2 also with diode D2 is connected, institute
The negative pole for stating diode D2 is connected with triode Q3 base stage, the grounded emitter of the triode Q3, the triode Q3's
Colelctor electrode is connected with electric capacity C1 one end,
One end also with resistance R8, R9 of the base stage of the triode Q2, electrochemical capacitor C3 positive pole are connected, the resistance R8
The 2nd pin connect+5V voltages, resistance R9 2 pin ground connection, the negative pole ground connection of the electrochemical capacitor C3.
The other end of the resistance R3 also between be connected to resistance R4, resistance R4 other end ground connection；
The other end of the resistance R1 is also associated with resistance R6, the resistance R6 other end ground connection；
The audio output is Wireless amplification audio amplifier.
Described local source of sound is mainly one in computer audio frequency or tape audio or VCD audios or DVD audios or microphone
Kind is several；
When there is broadcast singal input, broadcast singal is divided into two-way, wherein broadcast singal is through resistance R3 and resistance R4 all the way
Audio output is delivered to after partial pressure, is played out by Wireless amplification audio amplifier, another way broadcast singal divides through resistance R1 and R6
After pressure, DC voltage is obtained after diode D1 halfwave rectifier, now, triode Q1 conductings, because triode Q1 E poles connect
Ground, so the current potential of triode Q1 C poles is equal to 0V, triode Q2 E poles ground connection, due to triode Q2 B poles and triode
Q1 C is extremely connected, so the current potential of triode Q2 B poles is also equal to 0V, due to resistance R2 another termination+5V voltages, and three
Pole pipe Q3 E poles ground connection, so now Q3 is turned on, the current potential of triode Q3 C poles is 0V, and local sound source signal connects through electric capacity C1
Ground, so as to cut off local source of sound, so as to export broadcast singal；
When being inputted without broadcast singal, triode Q1 B poles no-voltage, triode Q1 is in cut-off state, resistance R8's
2nd pin is connected to+5V voltages, and now, resistance R8 and R9 is to be connected in series, triode Q2 conductings, and the current potential of triode Q2 C poles is
0V, because resistance R2 1 pin is extremely connected with triode Q2 C, diode D2 positive pole is also extremely connected with triode Q2 C, institute
Using now diode D2 A pin current potential as 0V, triode Q3 is in cut-off state, and local source of sound exports through electric capacity C1 and resistance R5
To audio output, played out by Wireless amplification audio amplifier.
The beneficial effects of the utility model are：Broadcast and local source of sound are believed by same audio output when there is broadcast
During number input, the input of local source of sound is automatically cut off, and switches to broadcast to export, broadcast sounds are played automatically, after waiting broadcast to discharge
Automatic switchback local source of sound, broadcast system can be used without individually matching somebody with somebody audio amplifier, using existing Wireless amplification audio amplifier, significantly simple
Change wiring flow, so as to reduce the workload of staff, not only further saved resource, while be also convenient for teacher's religion
Learn, whole-process automatic realization is intervened without teacher.
Brief description of the drawings
Fig. 1 is circuit diagram of the present utility model.
Embodiment
Specific embodiment of the present utility model is described further below in conjunction with the accompanying drawings：
As shown in figure 1, a kind of broadcast singal input automatic switch-over circuit, including broadcast signal input, local source of sound are defeated
Enter end, automatic switch-over circuit, audio output, the broadcast signal input is connected with resistance R1 and resistance R3, the resistance
The R3 other end is connected with audio output, and the other end of the resistance R1 is connected with automatic switch-over circuit, the local source of sound
Input is connected through electric capacity C1 and resistance R5 with audio output, and the local sound source input end is through electric capacity C1 and the electricity that automatically switches
Road connects；
The automatic switch-over circuit includes diode D1, D2, triode Q1, Q2, Q3, resistance R2, R7, R8, R9, electrolysis electricity
Hold C2, C3, the positive pole of the diode D1 is connected with resistance R1, the diode D1 negative poles through resistance R7 and electrochemical capacitor C2 and
Triode Q1 B poles (base stage) connection, described electrochemical capacitor C2 and resistance R7 are connected in parallel, resistance R7 one end and electrolysis electricity
The positive pole for holding C2 is connected, and the resistance R7 other end is grounded after being connected with electrochemical capacitor C2 negative pole；
E poles (emitter stage) ground connection of the triode Q1；The C poles (colelctor electrode) of the triode Q1 and triode Q2 B
Pole (base stage) is connected, and triode Q2 E poles ground connection, the C poles (colelctor electrode) of the triode Q2 are connected with resistance R2 one end, institute
State resistance R2 another termination+5V voltages, the positive pole of the C poles (colelctor electrode) of the triode Q2 also with diode D2 is connected, institute
The negative pole for stating diode D2 is connected with triode Q3 base stage, the grounded emitter of the triode Q3, the triode Q3's
Colelctor electrode is connected with electric capacity C1 one end,
The base stage of the triode Q2 is also connected with resistance R8, R9, electrochemical capacitor C3, and the 2nd pin of the resistance R8 meets+5V
Voltage, resistance R9 2 pin ground connection, the negative pole ground connection of the electrochemical capacitor C3；
The other end of the resistance R3 also between be connected to resistance R4, resistance R4 other end ground connection.
The other end of the resistance R1 is also associated with resistance R6, the resistance R6 other end ground connection.
The audio of the audio output output is mainly played out by Wireless amplification audio amplifier.
Described local source of sound refers mainly to one in computer audio frequency or tape audio or VCD audios or DVD audios or microphone
Kind is several；
When there is broadcast singal input, broadcast singal is divided into two-way, wherein broadcast singal is through resistance R3 and resistance R4 all the way
Audio output is delivered to after partial pressure, is played out by Wireless amplification audio amplifier, another way broadcast singal divides through resistance R1 and R6
After pressure, DC voltage is obtained after diode D1 halfwave rectifier, triode Q1 is turned on, because triode Q1 E poles are grounded, so
The current potential of triode Q1 C poles is equal to 0V, triode Q2 E poles ground connection, due to triode Q2 B poles and triode Q1 C poles
It is connected, so the current potential of triode Q2 B poles is also equal to 0V, due to resistance R2 another termination+5V voltages, triode Q3's
E poles are grounded, so now Q3 is turned on, the current potential of triode Q3 C poles is 0V, and local sound source signal is grounded through electric capacity C1, so as to
Local source of sound is cut off, so as to export broadcast singal；
When being inputted without broadcast singal, triode Q1 B poles no-voltage, triode Q1 is in cut-off state, resistance R8's
2nd pin is connected to+5V voltages, and now, resistance R8 and R9 is to be connected in series, triode Q2 conductings, and the current potential of triode Q2 C poles is
0V, because resistance R2 1 pin is extremely connected with triode Q2 C, diode D2 positive pole is also extremely connected with triode Q2 C, this
When, so diode D2 A pin current potential is 0V, triode Q3 is in cut-off state, and local source of sound is defeated through electric capacity C1 and resistance R5
Go out to audio output, played out by Wireless amplification audio amplifier.
Simply illustrate principle of the present utility model and most preferred embodiment described in above-described embodiment and specification, do not taking off
On the premise of the spirit and scope of the utility model, the utility model also has various changes and modifications, these changes and improvements
Both fall within claimed the scope of the utility model.
Claims (3)
1. a kind of broadcast singal inputs automatic switch-over circuit, including broadcast signal input, local sound source input end, automatic switchover
Circuit, audio output, the broadcast signal input are connected to resistance R1 and resistance R3, the other end of the resistance R3
It is connected with audio output, the other end of the resistance R1 is connected with automatic switch-over circuit, and the local sound source input end is through electricity
Hold C1 and resistance R5 to be connected with audio output, the local sound source input end is connected through electric capacity C1 with automatic switch-over circuit；
The automatic switch-over circuit includes diode D1, D2, triode Q1, Q2, Q3, resistance R2, R7, R8, R9, electrochemical capacitor
C2, C3, the positive pole of the diode D1 are connected with resistance R1, and the diode D1 negative poles are through resistance R7 and electrochemical capacitor C2 and three
Pole pipe Q1 B poles connection, described electrochemical capacitor C2 and resistance R7 are connected in parallel, and resistance R7 one end and electrochemical capacitor C2 are just
Extremely it is connected, the resistance R7 other end is grounded after being connected with electrochemical capacitor C2 negative pole；
The E poles ground connection of the triode Q1；The C poles of the triode Q1 are connected with triode Q2 B poles, triode Q2 E poles
Ground connection, the C poles of the triode Q2 are connected with resistance R2 one end, another termination+5V voltages of the resistance R2, three pole
Positive pole of the pipe Q2 C poles also with diode D2 is connected, and the negative pole of the diode D2 is connected with triode Q3 base stage, and described three
Pole pipe Q3 grounded emitter, the colelctor electrode of the triode Q3 are connected with electric capacity C1 one end,
One end also with resistance R8, R9 of the base stage of the triode Q2, electrochemical capacitor C3 positive pole are connected, and the of the resistance R8
2 pin connect+5V voltages, resistance R9 2 pin ground connection, the negative pole ground connection of the electrochemical capacitor C3.
A kind of 2. broadcast singal input automatic switch-over circuit according to claim 1, it is characterised in that：The resistance R3's
The one end of the other end also with resistance R4 is connected, the other end ground connection of the resistance R4.
A kind of 3. broadcast singal input automatic switch-over circuit according to claim 1, it is characterised in that：The resistance R1's
The other end is also associated with resistance R6, the resistance R6 other end ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720308975.XU CN207039876U (en) | 2017-03-28 | 2017-03-28 | A kind of broadcast singal inputs automatic switch-over circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720308975.XU CN207039876U (en) | 2017-03-28 | 2017-03-28 | A kind of broadcast singal inputs automatic switch-over circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207039876U true CN207039876U (en) | 2018-02-23 |
Family
ID=61473226
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720308975.XU Expired - Fee Related CN207039876U (en) | 2017-03-28 | 2017-03-28 | A kind of broadcast singal inputs automatic switch-over circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207039876U (en) |
-
2017
- 2017-03-28 CN CN201720308975.XU patent/CN207039876U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180223 Termination date: 20190328 |
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| CF01 | Termination of patent right due to non-payment of annual fee |