CN203104756U - Mute circuit during turning on and off - Google Patents
Mute circuit during turning on and off Download PDFInfo
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- CN203104756U CN203104756U CN 201320079943 CN201320079943U CN203104756U CN 203104756 U CN203104756 U CN 203104756U CN 201320079943 CN201320079943 CN 201320079943 CN 201320079943 U CN201320079943 U CN 201320079943U CN 203104756 U CN203104756 U CN 203104756U
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- triode
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Abstract
The utility model relates to a mute circuit during turning on and off. The mute circuit comprises a direct-current power supply, a power amplifier chip, a PNP (positive-negative-positive) type triode, two energy storage capacitors and a reverse circuit, wherein the base electrode of the PNP type triode is earthed through the first energy storage capacitor on one hand, and is connected with the end of the direct-current power supply on the other hand; one path of an emitting electrode is earthed through the second energy storage capacitor, and the other path of the emitting electrode is connected with the cathode of a switching diode; the anode of the diode is connected with the end of the direct-current power supply; the emitting electrode is further earthed through a voltage stabilizing diode; and a collector electrode is connected with a voice frequency signal output control end of the equipment. The mute circuit adopts resistors and capacitors to form a charging circuit when turning on and off; and after turning off, the reverse diode and large capacitors are utilized for supplying power continuously, so that the mute circuit during the process of turning on and off is guaranteed to be timely, continuous and effective. The mute circuit is timely and effectively controlled by using low-cost sorting devices.
Description
Technical field
The utility model relates to the mute circuit technical field, especially a kind of mute circuit for open and close.
Background technology
In the use of automobile audio product, in automotive ignition, sometimes can finish owing to Sound Processor Unit modules A SP in the acoustic product circuit also fails initialization effectively and timely, having unusual noise string in the circuit goes out to enter power amplifier and then causes loudspeaker the POP sound can occur, equally in direct flame-out the pulling key of automobile, because the directly disconnected power down source of ASP module also has unusual noise string and goes out to enter power amplifier and then cause loudspeaker the POP sound can occur in the acoustics circuit in the circuit.
Present circuit mainly is by MCU sense switch machine state, IO by MCU comes the quiet control of power amplifier, control power amplifier when quiet exporting by the IO mouth of MCU, owing to hold bad to time control, sometimes also having the POP sound occurs, and circuit structure relative complex, cost height, reliability are low, and can not be applicable in all stereo sets.
The utility model content
In view of above-mentioned condition, be necessary to provide a kind of and go in all stereo sets, in the switching on and shutting down process, can effectively carry out quietly to stereo set, avoid occurring the circuit of POP sound.
A kind of mute circuit for open and close comprises DC power supply and power amplifier chip, a positive-negative-positive triode, two storage capacitors and a negater circuit; The base stage of this positive-negative-positive triode is on the one hand through the first storage capacitor ground connection, connect this dc power supply terminal on the other hand, emitter one tunnel is through the second storage capacitor ground connection, another road connects the negative electrode of a switching diode, the anode of this diode connects this dc power supply terminal, this emitter is also through a zener diode ground connection, and collector electrode is through the audio signal output control end of negater circuit connection device.
Be connected with the parallel branch of resistance and bleed off diode between the base stage of this dc power supply terminal and positive-negative-positive triode, the negative electrode of this bleed off diode connects this dc power supply terminal, and anode connects the base stage of this positive-negative-positive triode.
Be connected with current-limiting resistance between the emitter of this positive-negative-positive triode and second storage capacitor.
Be connected with a resistance between the base stage of this positive-negative-positive triode and first storage capacitor, this resistance and first storage capacitor are formed the RC delay circuit.
Include a NPN type triode in this negater circuit, the base stage of this NPN type triode connects the collector electrode of this positive-negative-positive triode, and the collection utmost point of this NPN type triode is through the second storage capacitor ground connection, and emitting stage connects the audio signal output control end of this equipment.
The emitter of this NPN type triode is connected with a positive-negative-positive triode, and the emitter of this NPN type triode links to each other with the emitter of this positive-negative-positive triode.
Above-mentioned mute circuit for open and close, it is simple in structure, components and parts conveniently are easy to get, cost is low, do not need the software control of MCU, and design and debugging are easily, need few workload, this circuit can be used for vehicle-carrying DVD media product, auto radio, CD machine of automobile, guarantee hoot device automotive ignition or flame-out in, avoid hoot device unusual noise to occur, influence the user experience of client product.
Description of drawings
Fig. 1 is the circuit theory diagrams of the utility model mute circuit for open and close embodiment.
Embodiment
Below in conjunction with drawings and Examples mute circuit for open and close of the present utility model is described in further detail.
See also Fig. 1, a kind of mute circuit for open and close of the utility model embodiment comprises DC power supply ON/OFF_DC and power amplifier chip, also comprises a positive-negative-positive triode Q1, two storage capacitors and a negater circuit; The base stage of this positive-negative-positive triode Q1 is on the one hand through the first storage capacitor C49 ground connection, connect this dc power supply terminal on the other hand, emitter one tunnel is through the second storage capacitor ground connection, another road connects the negative electrode of a switching diode D5, the anode of this diode D4 connects this dc power supply terminal, this emitter is also through a zener diode ground connection, and collector electrode is through the audio signal output control end of negater circuit connection device.
Be connected with the parallel branch of a resistance R 36 and bleed off diode D5 between the base stage of this DC power supply ON/OFF_DC end and positive-negative-positive triode Q1, the negative electrode of this bleed off diode D5 connects this DC power supply ON/OFF_DC end, and anode connects the base stage of this positive-negative-positive triode Q1.
Be connected with current-limiting resistance R41 between the emitter of this positive-negative-positive triode Q1 and the second storage capacitor C48.
Be connected with a resistance R 38 between the base stage of this positive-negative-positive triode Q1 and the first storage capacitor C49, this resistance R 38 and the first storage capacitor C49 form the RC delay circuit.
Include a NPN type triode Q2 in this negater circuit, the base stage of this NPN type triode Q2 connects the collector electrode of this positive-negative-positive triode Q1, the collection utmost point of this NPN type triode Q2 is through the second storage capacitor C48 ground connection, and emitting stage connects the audio signal output control end of this equipment.
The emitter of this NPN type triode Q2 is connected with a positive-negative-positive triode Q32, and the emitter of this NPN type triode Q2 links to each other with the emitter of this positive-negative-positive triode Q32.
Operation principle: during start, ON/OFF_DC gives the power supply of Q2 collector electrode through D4, simultaneously also to the power supply of Q1 emission collection, another road adds to the Q1 base stage through R36, to the C49 charging, presses index rising-Q1 with Vb1 conducting-Q2 conducting according to electric capacity charge characteristic Vb1 simultaneously, quiet driving triode carries out quiet Ve2 along with Q32 adds to, along with the C49 charging is finished, Q1 is transferred to by conducting and ending, and the turn-on muting process is finished.
During shutdown, the disappearance of ON/OFF_DC supply voltage, the C48 discharge, to the Q2 power supply, C49 is through the D5 discharge, and decline-Q1(PNP) conducting-Q2 ends Vb1, and Ve2 adds to quiet driving triode through Q32 and carries out quiet.Along with C48, C49 discharge is finished, and Q1 is become by conducting and ends, Q2, and Q32 also ends thereupon, and the shutdown mute circuit is finished.
Above-mentioned mute circuit for open and close, it is simple in structure, components and parts conveniently are easy to get, cost is low, do not need the software control of MCU, and design and debugging are easily, need few workload, this circuit can be used for vehicle-carrying DVD media product, auto radio, CD machine of automobile, guarantee hoot device automotive ignition or flame-out in, avoid hoot device unusual noise to occur, influence the user experience of client product.
The above, it only is preferred embodiment of the present utility model, be not that the utility model is done any pro forma restriction, though the utility model discloses as above with preferred embodiment, yet be not in order to limit the utility model, any those skilled in the art, in not breaking away from the technical solutions of the utility model scope, when the technology contents that can utilize above-mentioned announcement is made a little change or is modified to the equivalent embodiment of equivalent variations, in every case be not break away from the technical solutions of the utility model content, according to technical spirit of the present utility model to any simple modification that above embodiment did, equivalent variations and modification all still belong in the scope of technical solutions of the utility model.For example, the utility model not only solves the automobile audio product, also can be used in other equipment that contain the audio frequency amplification.
Claims (6)
1. a mute circuit for open and close comprises DC power supply and power amplifier chip, it is characterized in that: also comprise a positive-negative-positive triode, two storage capacitors and a negater circuit; The base stage of this positive-negative-positive triode is on the one hand through the first storage capacitor ground connection, connect this dc power supply terminal on the other hand, emitter one tunnel is through the second storage capacitor ground connection, another road connects the negative electrode of a switching diode, the anode of this diode connects this dc power supply terminal, this emitter is also through a zener diode ground connection, and collector electrode is through the audio signal output control end of negater circuit connection device.
2. mute circuit for open and close as claimed in claim 1, it is characterized in that: the parallel branch that is connected with resistance and bleed off diode between the base stage of this dc power supply terminal and positive-negative-positive triode, the negative electrode of this bleed off diode connects this dc power supply terminal, and anode connects the base stage of this positive-negative-positive triode.
3. mute circuit for open and close as claimed in claim 1 is characterized in that: be connected with current-limiting resistance between the emitter of this positive-negative-positive triode and second storage capacitor.
4. mute circuit for open and close as claimed in claim 1 is characterized in that: be connected with a resistance between the base stage of this positive-negative-positive triode and first storage capacitor, this resistance and first storage capacitor are formed the RC delay circuit.
5. as each described mute circuit for open and close in the claim 1 to 4, it is characterized in that: include a NPN type triode in this negater circuit, the base stage of this NPN type triode connects the collector electrode of this positive-negative-positive triode, the collection utmost point of this NPN type triode is through the second storage capacitor ground connection, and emitting stage connects the audio signal output control end of this equipment.
6. mute circuit for open and close as claimed in claim 5 is characterized in that: the emitter of this NPN type triode is connected with a positive-negative-positive triode, and the emitter of this NPN type triode links to each other with the emitter of this positive-negative-positive triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320079943 CN203104756U (en) | 2013-02-21 | 2013-02-21 | Mute circuit during turning on and off |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320079943 CN203104756U (en) | 2013-02-21 | 2013-02-21 | Mute circuit during turning on and off |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203104756U true CN203104756U (en) | 2013-07-31 |
Family
ID=48856125
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320079943 Expired - Fee Related CN203104756U (en) | 2013-02-21 | 2013-02-21 | Mute circuit during turning on and off |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203104756U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107580278A (en) * | 2017-10-17 | 2018-01-12 | 怀集县正华电器有限公司 | A kind of Stereo Switch machine protecting against shock sound and output short circuit protection circuit |
| EP3668111A4 (en) * | 2017-08-10 | 2021-04-28 | JRD Communication (Shenzhen) Ltd | Mute control circuit used upon power-on or power-of, control method, and audio device |
-
2013
- 2013-02-21 CN CN 201320079943 patent/CN203104756U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3668111A4 (en) * | 2017-08-10 | 2021-04-28 | JRD Communication (Shenzhen) Ltd | Mute control circuit used upon power-on or power-of, control method, and audio device |
| CN107580278A (en) * | 2017-10-17 | 2018-01-12 | 怀集县正华电器有限公司 | A kind of Stereo Switch machine protecting against shock sound and output short circuit protection circuit |
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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: 20130731 Termination date: 20180221 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |