CN203968349U - A kind of playback set - Google Patents
A kind of playback set Download PDFInfo
- Publication number
- CN203968349U CN203968349U CN201420343876.1U CN201420343876U CN203968349U CN 203968349 U CN203968349 U CN 203968349U CN 201420343876 U CN201420343876 U CN 201420343876U CN 203968349 U CN203968349 U CN 203968349U
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- China
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- resistance
- time relay
- comparator
- coil
- diode
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- Expired - Fee Related
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Abstract
The utility model discloses a kind of playback set, belong to electroacoustic techniques field.This device comprises coil, diode, electric capacity, comparator, the time relay, audio chip, loud speaker, the first resistance, the second resistance and the 3rd resistance; One end of described coil and the anodic bonding of diode, the negative electrode of diode connects respectively one end of electric capacity and the in-phase end of comparator, one end access power supply of described the first resistance, the first resistance other end connects respectively one end of the second resistance and the end of oppisite phase of comparator, one end of described time relay coil is connected with the output of comparator, the other end access power supply of time relay coil, one end of described time relay normally-closed contact is connected with the audio input end of audio chip by the 3rd resistance, and the audio output of described audio chip connects loud speaker.The utility model can be responded near mobile phone signal, and automatically playback volume is turned down after sensing mobile phone signal, thereby reduces the impact on mobile phone caller.
Description
Technical field
The utility model relates to a kind of playback set, belongs to electroacoustic techniques field.
Background technology
In some public places, a lot of playback sets be can be provided with, music or program are used for playing, yet, when being positioned at the nearer people of playback set and need to playing mobile phone, will be subject to the impact that playback set spreads out of sound, thereby be difficult to carry out mobile phone communication, very inconvenient.
Utility model content
The utility model, for the problem in background technology, proposes a kind of playback set.
The utility model, for overcoming the above problems, adopts following technical scheme:
A playback set, comprises coil, diode, electric capacity, comparator, the time relay, audio chip, loud speaker, the first resistance, the second resistance and the 3rd resistance, one end of described coil and the anodic bonding of diode, the negative electrode of diode connects respectively one end of electric capacity and the in-phase end of comparator, one end access power supply of described the first resistance, the first resistance other end connects respectively one end of the second resistance and the end of oppisite phase of comparator, one end of described time relay coil is connected with the output of comparator, the other end access power supply of time relay coil, one end of described time relay normally-closed contact is connected with the audio input end of audio chip by the 3rd resistance, the audio output of described audio chip connects loud speaker, the other end of described coil, the other end of electric capacity, the equal ground connection of the other end of the other end of the second resistance and time relay normally-closed contact.
Preferably, the described time relay adopts the on-delay type time relay.
Preferably, described audio chip adopts TEA2025B.
Technique effect:
1, the utility model can be responded near mobile phone signal, and automatically playback volume is turned down after sensing mobile phone signal, thereby reduces the impact on mobile phone caller.
2, the utility model design is ingenious, with low cost, has good practical value.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the technical solution of the utility model is done in further detail and is introduced:
Circuit theory diagrams of the present utility model as shown in Figure 1, comprise coil L1, diode D1, capacitor C 1, comparator U1, time relay K1, audio chip U2, loud speaker LS1, the first resistance R 1, the second resistance R 2 and the 3rd resistance R 3, the anodic bonding of one end of described coil L1 and diode D1, the negative electrode of diode D1 connects respectively one end of capacitor C 1 and the in-phase end of comparator U1, one end access power supply of described the first resistance R 1, first resistance R 1 other end connects respectively one end of the second resistance R 2 and the end of oppisite phase of comparator U1, one end of described time relay K1 coil is connected with the output of comparator U1, the other end access power supply of time relay K1 coil, one end of described time relay K1 normally-closed contact is connected with the audio input end of audio chip U2 by the 3rd resistance R 3, the audio output of described audio chip U2 connects loud speaker LS1, the other end of described coil L1, the other end of capacitor C 1, the equal ground connection of the other end of the other end of the second resistance R 2 and time relay K1 normally-closed contact.
Described time relay K1 adopts the on-delay type time relay; Described comparator adopts the LM339 of PHILIPS company.
Described audio chip U2 adopts the TEA2025B of ST company, for pass to loud speaker after audio input signal is amplified.
Operation principle of the present utility model is as follows, when there is no mobile phone signal near device, coil L1 does not produce induced signal, the voltage of the in-phase end of comparator U1 is less than backward end, now, the output of comparator U1 is 0V, the coil electricity of time relay K1 also starts timing, after time of advent relay K 1 setting delay time (as 1 second), the normally-closed contact of time relay K1 disconnects, audio input signal normally enters audio chip U2, and audio chip U2 control loudspeaker LS1 plays with common volume.When there is mobile phone signal near device, coil L1 can produce induced signal, induced signal is after diode D1, form a succession of pulse signal: when this pulse signal is during in high level, the voltage of the in-phase end of comparator U1 is greater than backward end, now, the output of comparator U1 is high level, and in moment, make the coil blackout of time relay K1, so, the normally-closed contact of time relay K1 returns to closure state, audio input signal is connected into ground by the 3rd resistance R 3, the lower voltage of audio input signal, now, audio chip U2 control loudspeaker LS1 is to play compared with amount of bass, when this pulse signal is during in low level, the voltage of the in-phase end of comparator U1 is less than backward end, now, the output of comparator U1 is low level, the coil electricity of time relay K1 also starts timing, yet, because pulse signal is very short in the low level time, therefore, the coil electrify time of time relay K1 is very short the setting delay time of relay K 1 (can the time of advent), and so, the normally-closed contact of time relay K1 just can not disconnect, the voltage of audio input signal can continue to be dragged down, thereby guarantees that mobile phone communication person converses.
Claims (3)
1. a playback set, is characterized in that: comprise coil (L1), diode (D1), electric capacity (C1), comparator (U1), the time relay (K1), audio chip (U2), loud speaker (LS1), the first resistance (R1), the second resistance (R2) and the 3rd resistance (R3), the anodic bonding of one end of described coil (L1) and diode (D1), the negative electrode of diode (D1) connects respectively one end of electric capacity (C1) and the in-phase end of comparator (U1), one end access power supply of described the first resistance (R1), the other end of the first resistance (R1) connects respectively one end of the second resistance (R2) and the end of oppisite phase of comparator (U1), one end of the described time relay (K1) coil is connected with the output of comparator (U1), the other end access power supply of the time relay (K1) coil, one end of the described time relay (K1) normally-closed contact is connected with the audio input end of audio chip (U2) by the 3rd resistance (R3), the audio output of described audio chip (U2) connects loud speaker (LS1), the other end of described coil (L1), the other end of electric capacity (C1), the equal ground connection of the other end of the other end of the second resistance (R2) and the time relay (K1) normally-closed contact.
2. a kind of playback set according to claim 1, is characterized in that: the described time relay (K1) adopts the on-delay type time relay.
3. a kind of playback set according to claim 1, is characterized in that: described audio chip (U2) adopts TEA2025B.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420343876.1U CN203968349U (en) | 2014-06-25 | 2014-06-25 | A kind of playback set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420343876.1U CN203968349U (en) | 2014-06-25 | 2014-06-25 | A kind of playback set |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203968349U true CN203968349U (en) | 2014-11-26 |
Family
ID=51928886
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420343876.1U Expired - Fee Related CN203968349U (en) | 2014-06-25 | 2014-06-25 | A kind of playback set |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203968349U (en) |
-
2014
- 2014-06-25 CN CN201420343876.1U patent/CN203968349U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20141126 Termination date: 20150625 |
|
| EXPY | Termination of patent right or utility model |