CN219834379U - Circuit for eliminating startup and shutdown impact sound of audio equipment - Google Patents
Circuit for eliminating startup and shutdown impact sound of audio equipment Download PDFInfo
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- CN219834379U CN219834379U CN202320800477.2U CN202320800477U CN219834379U CN 219834379 U CN219834379 U CN 219834379U CN 202320800477 U CN202320800477 U CN 202320800477U CN 219834379 U CN219834379 U CN 219834379U
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- 239000003990 capacitor Substances 0.000 claims abstract description 34
- 238000001514 detection method Methods 0.000 claims abstract description 25
- 230000005669 field effect Effects 0.000 claims abstract description 25
- 238000010586 diagram Methods 0.000 description 3
- 230000006698 induction Effects 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
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- 101000677914 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) 40S ribosomal protein S5 Proteins 0.000 description 1
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Abstract
The utility model discloses a circuit for eliminating the startup and shutdown impact sound of audio equipment, which comprises a power-on delay circuit, a power-off detection circuit, a trigger circuit and a signal on-off circuit; the output end of the power-on delay circuit is connected with the input end of the trigger circuit, the output end of the power-off detection circuit is connected with the input end of the trigger circuit, and the output end of the trigger circuit is connected with the input end of the signal on-off circuit; the signal on-off circuit comprises a first resistor, a first diode, a first capacitor, a second resistor and a field effect transistor. In the embodiment, the switching on/off impact sound of the equipment is blocked by closing the field effect transistor. The circuit capable of eliminating the on-off impact sound of the audio equipment can be widely applied to the technical field of mute circuits.
Description
Technical Field
The utility model relates to the technical field of mute circuits, in particular to a circuit for eliminating the on-off impact sound of audio equipment.
Background
As society progresses, more and more places are available for audio amplification or audio equipment. When the audio equipment is started and shut down, because the power-on or power-off time sequences of the power supply ends of different chips are different, an impact signal can be generated between the front stage and the rear stage of the circuit, so that the startup and shutdown impact sound is generated. At present, a circuit for preventing the startup and shutdown impact sound generally comprises a relay and a plurality of components. The price of the relay is not low, the larger volume of the relay occupies more space, the induction voltage can be generated in a switch state, the induction voltage can influence a chip on a power bus, and an additional circuit is needed to limit the induction voltage. In designing audio products, the construction space and material costs are often increased by the use of relays. This is disadvantageous in terms of design flexibility and cost.
Disclosure of Invention
In view of the above, the embodiment of the utility model provides a circuit for eliminating the on-off impact sound of the audio equipment.
The embodiment of the utility model provides a circuit for eliminating the startup and shutdown impact sound of audio equipment, which comprises a power-on delay circuit, a power-off detection circuit, a trigger circuit and a signal on-off circuit; the output end of the power-on delay circuit is connected with the input end of the trigger circuit, the output end of the power-off detection circuit is connected with the input end of the trigger circuit, and the output end of the trigger circuit is connected with the input end of the signal on-off circuit; the signal on-off circuit comprises a first resistor, a first diode, a first capacitor, a second resistor and a field effect tube, wherein the output end of the trigger circuit is connected with the input end of the first resistor, the first resistor is connected with the first diode in parallel, the first output end of the first resistor is connected with the G electrode of the field effect tube, the second output end of the first resistor is connected with the input end of the first capacitor, the output end of the first capacitor is connected with the input end of the second resistor, the input end of the second resistor is connected with the D electrode of the field effect tube, and the S electrode of the field effect tube is connected with the loudspeaker.
Optionally, the power-on delay circuit comprises a third resistor, a fourth resistor and a second capacitor, wherein the third resistor is connected in series with the fourth resistor, and the fourth resistor is connected in parallel with the second capacitor.
Optionally, the power failure detection circuit includes a fifth resistor, a first triode and a second diode, the fifth resistor is connected in parallel with the second diode, an output end of the fifth resistor is connected with a B electrode of the first triode, an output end of the second diode is connected with an E electrode of the first triode, and a C electrode of the first triode is connected with an input end of the trigger circuit.
Optionally, the trigger circuit includes third diode, second triode, sixth resistance, seventh resistance, third diode and eighth resistance, the output of third diode is connected the B electrode of second triode, the E electrode of second triode is connected the input of eighth resistance, the C electrode of second triode is connected the input of sixth resistance, the output of sixth resistance is connected the B electrode of third diode, the one end of seventh resistance is connected the B electrode of third diode, the other end of seventh resistance is connected the E electrode of third diode, the C electrode of third diode is connected the input of signal break-make circuit.
Optionally, the signal on-off circuit further comprises a ninth resistor, one end of the ninth resistor is connected with the ground wire, and the other end of the ninth resistor is connected with the input end of the loudspeaker.
Optionally, the power failure detection circuit further includes a third capacitor, one end of the third capacitor is connected to a ground line, and the other end of the third capacitor is connected to the E electrode of the first triode.
Optionally, the power failure detection circuit further includes a tenth resistor, a third triode and an eleventh resistor, one end of the tenth resistor is connected with the C electrode of the third diode, the other end of the tenth resistor is connected with the B electrode of the third triode, and one end of the eleventh resistor is connected with the B electrode of the third triode. The other end of the eleventh resistor is connected with the E electrode of the third triode, and the C electrode of the third triode is connected with the input end of the trigger circuit.
The technical scheme in the embodiment of the utility model has the following advantages: according to the embodiment of the utility model, the power-on delay circuit delays the power-on signal, the power-off detection circuit detects the power-off state, and the trigger circuit sends the trigger signal to the signal on-off circuit to control the closing of the channel, so that the on-off impact sound of the equipment is blocked.
Drawings
FIG. 1 is a block diagram showing the overall structure of a circuit for eliminating the power on/off impact sound of an audio device according to the present utility model;
FIG. 2 is a block diagram of the overall structure of a signal on-off circuit for eliminating the on-off impact sound of an audio device according to the present utility model;
fig. 3 is a block diagram of the overall structure of the rest of the circuit for eliminating the on-off impact sound of the audio equipment according to the present utility model.
Detailed Description
The utility model is further explained and illustrated below with reference to the drawing and the specific embodiments of the present specification.
Referring to fig. 1 and 2, an embodiment of the present utility model provides a circuit for eliminating an on-off impact sound of an audio device, including a power-on delay circuit, a power-off detection circuit, a trigger circuit and a signal on-off circuit; the output end of the power-on delay circuit is connected with the input end of the trigger circuit, the output end of the power-off detection circuit is connected with the input end of the trigger circuit, and the output end of the trigger circuit is connected with the input end of the signal on-off circuit; the signal on-off circuit comprises a first resistor R601, a first diode D52, a first capacitor C533, a second resistor R595 and a field effect tube Q19, wherein the output end of the trigger circuit is connected with the input end of the first resistor, the first resistor is connected with the first diode in parallel, the first output end of the first resistor is connected with the G electrode of the field effect tube, the second output end of the first resistor is connected with the input end of the first capacitor, the output end of the first capacitor is connected with the input end of the second resistor, the input end of the second resistor is connected with the D electrode of the field effect tube, and the S electrode of the field effect tube is connected with the loudspeaker.
In the embodiment of the utility model, when the audio equipment is started and shut down, because the power-on or power-off time sequences of the power supply ends of different chips are different, impact signals can be generated between the front stage and the rear stage of the circuit. If no measures are taken, the impact signal is output to the subsequent stage for amplification, and finally becomes impact sound through a loudspeaker, namely a common POP sound, namely a switching impact sound. The circuit for eliminating the startup and shutdown impact sound of the audio equipment comprises a power-on delay circuit, a power-off detection circuit, a trigger circuit and a signal on-off circuit, wherein the power-on or power-off signal is blocked by a field effect transistor in the signal on-off circuit, the signal on-off circuit comprises a first resistor R601, a first diode D52, a first capacitor C533, a second resistor R595 and a field effect transistor Q19, the output end of the trigger circuit is connected with the input end of the first resistor, the first resistor is connected with the first diode in parallel, the first output end of the first resistor is connected with the G electrode of the field effect transistor, the second output end of the first resistor is connected with the input end of the first capacitor, the output end of the first capacitor is connected with the input end of the second resistor, the input end of the second resistor is connected with the D electrode of the field effect transistor, and the S electrode of the field effect transistor is connected with a loudspeaker; wherein, MUTE represents the trigger signal sent by the trigger circuit. When the startup impact signal arrives, the field effect transistor Q19 is in an off state, and the power-on impact signal is blocked by the field effect transistor Q19. The channel of the field effect transistor Q19 is closed before the shutdown signal is generated, the impact signal can not be sent outwards, and the circuit well blocks the startup and shutdown impact sound of the equipment.
Further as a preferred embodiment, the power-on delay circuit includes a third resistor, a fourth resistor, and a second capacitor, the third resistor is connected in series with the fourth resistor, and the fourth resistor is connected in parallel with the second capacitor.
Referring to fig. 3, the power-on delay circuit includes a third resistor R606, a fourth resistor RP19, and a second capacitor C559, the third resistor being connected in series with the fourth resistor, and the fourth resistor being connected in parallel with the second capacitor. One end of the second capacitor is connected with the ground GND, the other end of the second capacitor is connected with the third resistor, and one end of the third resistor is connected with the supply voltage VCC of the circuit, wherein the MUTE represents a trigger signal sent by the trigger circuit.
Further as a preferred embodiment, the power failure detection circuit includes a fifth resistor, a first triode and a second diode, the fifth resistor is connected in parallel with the second diode, an output end of the fifth resistor is connected with a B electrode of the first triode, an output end of the second diode is connected with an E electrode of the first triode, and a C electrode of the first triode is connected with an input end of the trigger circuit.
Referring to fig. 3, the power failure detection circuit includes a fifth resistor RP14, a first triode QP4, and a second diode D53, where the fifth resistor is connected in parallel with the second diode, an output end of the fifth resistor is connected to a B electrode of the first triode, an output end of the second diode is connected to an E electrode of the first triode, and a C electrode of the first triode is connected to an input end of the trigger circuit. One end of the fifth resistor is also connected with a power supply voltage VCC of the circuit.
Further as a preferred embodiment, the trigger circuit includes a third diode, a second triode, a sixth resistor, a seventh resistor, a third diode and an eighth resistor, wherein an output end of the third diode is connected with a B electrode of the second triode, an E electrode of the second triode is connected with an input end of the eighth resistor, a C electrode of the second triode is connected with an input end of the sixth resistor, an output end of the sixth resistor is connected with a B electrode of the third diode, one end of the seventh resistor is connected with a B electrode of the third diode, the other end of the seventh resistor is connected with an E electrode of the third diode, and a C electrode of the third diode is connected with an input end of the signal on-off circuit.
Referring to fig. 3, the trigger circuit includes a third diode DP11, a second triode QP5, a sixth resistor R598, a seventh resistor R592, a third diode QP3, and an eighth resistor R605, where an output end of the third diode is connected to a B electrode of the second triode, an E electrode of the second triode is connected to an input end of the eighth resistor, a C electrode of the second triode is connected to an input end of the sixth resistor, an output end of the sixth resistor is connected to a B electrode of the third diode, one end of the seventh resistor is connected to a B electrode of the third diode, another end of the seventh resistor is connected to an E electrode of the third diode, and a C electrode of the third diode is connected to an input end of the signal on-off circuit. One end of the seventh resistor is also connected with a power supply voltage VCC of the circuit.
Further as a preferred embodiment, the signal on-off circuit further includes a ninth resistor, one end of the ninth resistor is connected to the ground, and the other end of the ninth resistor is connected to an input end of the speaker.
Referring to fig. 2, the signal on-off circuit further includes a ninth resistor R594 having one end connected to the ground line and the other end connected to the input terminal of the speaker.
Further as a preferred embodiment, the power failure detection circuit further includes a third capacitor, one end of the third capacitor is connected to a ground line, and the other end of the third capacitor is connected to the E electrode of the first triode.
Referring to fig. 3, the power failure detection circuit further includes a third capacitor C558, one end of which is connected to the ground, and the other end of which is connected to the E electrode of the first triode, for filtering voltage.
Further as a preferred embodiment, the power failure detection circuit further includes a tenth resistor, a third triode, and an eleventh resistor, one end of the tenth resistor is connected to the C electrode of the third diode, the other end of the tenth resistor is connected to the B electrode of the third triode, and one end of the eleventh resistor is connected to the B electrode of the third triode. The other end of the eleventh resistor is connected with the E electrode of the third triode, and the C electrode of the third triode is connected with the input end of the trigger circuit.
Referring to fig. 3, the power failure detection circuit further includes a tenth resistor R607, a third triode QP6, and an eleventh resistor R608, one end of the tenth resistor is connected to the C electrode of the third diode, the other end of the tenth resistor is connected to the B electrode of the third triode, and one end of the eleventh resistor is connected to the B electrode of the third triode. The other end of the eleventh resistor is connected with the E electrode of the third triode, and the C electrode of the third triode is connected with the input end of the trigger circuit.
The operation principle of this embodiment is that the signal on-off circuit is in an off state after the device is powered on, and after a period of time, the power-on delay circuit sends a high level to the trigger circuit, at this time, the third diode QP3 of the trigger circuit is pulled down by the second triode QP5 because the base voltage, and the collector of the third diode QP3 sends a high level to the signal on-off circuit to control the conduction of the field effect transistor Q19. The fet Q19 is in an off state when the power-on surge signal arrives, so the surge signal is blocked by the fet Q19. The power VCC of the circuit will start to decrease after the device is powered down. At this time, the base voltage of the first triode QP4 in the power-down detection circuit is also reduced, and when the base voltage is lower than the emitter voltage by 0.6V, the collector output high level turns on the collector and the emitter of the third triode QP6, so that the trigger level of the trigger circuit is released to turn off the fet Q19. Because the power down detection circuit can quickly judge the power down state, the channel of the field effect transistor Q19 is closed before the shutdown signal is generated, and therefore the impact signal cannot be sent outwards. The circuit well blocks the on-off impact sound of the equipment.
In summary, compared with the prior art, the utility model has the following advantages: the utility model can be realized by using common triode, field effect transistor, resistor and capacitor. It is very advantageous in terms of both volume taken up, cost of construction, and flexibility of use. The circuit has the advantages of small occupied space, high use flexibility, low material cost, easiness in realization, simple circuit structure, stability, reliability and the like.
While the preferred embodiment of the present utility model has been described in detail, the present utility model is not limited to the above embodiments, and various equivalent modifications and substitutions can be made by those skilled in the art without departing from the spirit of the present utility model, and these equivalent modifications and substitutions are intended to be included in the scope of the present utility model as defined in the appended claims.
Claims (7)
1. A circuit for eliminating the startup and shutdown impact sound of an audio device is characterized in that: the power-on/power-off detection circuit comprises a power-on delay circuit, a power-off detection circuit, a trigger circuit and a signal on-off circuit; the output end of the power-on delay circuit is connected with the input end of the trigger circuit, the output end of the power-off detection circuit is connected with the input end of the trigger circuit, and the output end of the trigger circuit is connected with the input end of the signal on-off circuit; the signal on-off circuit comprises a first resistor, a first diode, a first capacitor, a second resistor and a field effect tube, wherein the output end of the trigger circuit is connected with the input end of the first resistor, the first resistor is connected with the first diode in parallel, the first output end of the first resistor is connected with the G electrode of the field effect tube, the second output end of the first resistor is connected with the input end of the first capacitor, the output end of the first capacitor is connected with the input end of the second resistor, the input end of the second resistor is connected with the D electrode of the field effect tube, and the S electrode of the field effect tube is connected with the loudspeaker.
2. A circuit for canceling an on-off impact sound of an audio device as claimed in claim 1, wherein: the power-on delay circuit comprises a third resistor, a fourth resistor and a second capacitor, wherein the third resistor is connected with the fourth resistor in series, and the fourth resistor is connected with the second capacitor in parallel.
3. A circuit for canceling an on-off impact sound of an audio device as claimed in claim 1, wherein: the power failure detection circuit comprises a fifth resistor, a first triode and a second diode, wherein the fifth resistor is connected with the second diode in parallel, the output end of the fifth resistor is connected with the B electrode of the first triode, the output end of the second diode is connected with the E electrode of the first triode, and the C electrode of the first triode is connected with the input end of the trigger circuit.
4. A circuit for canceling an on-off impact sound of an audio device as claimed in claim 1, wherein: the trigger circuit comprises a third diode, a second triode, a sixth resistor, a seventh resistor, a third diode and an eighth resistor, wherein the output end of the third diode is connected with the B electrode of the second triode, the E electrode of the second triode is connected with the input end of the eighth resistor, the C electrode of the second triode is connected with the input end of the sixth resistor, the output end of the sixth resistor is connected with the B electrode of the third diode, one end of the seventh resistor is connected with the B electrode of the third diode, the other end of the seventh resistor is connected with the E electrode of the third diode, and the C electrode of the third diode is connected with the input end of the signal on-off circuit.
5. A circuit for canceling an on-off impact sound of an audio device as claimed in claim 1, wherein: the signal on-off circuit further comprises a ninth resistor, one end of the ninth resistor is connected with the ground wire, and the other end of the ninth resistor is connected with the input end of the loudspeaker.
6. A circuit for canceling an on-off impact sound of an audio device as claimed in claim 1, wherein: the power failure detection circuit further comprises a third capacitor, one end of the third capacitor is connected with a ground wire, and the other end of the third capacitor is connected with an E electrode of the first triode.
7. A circuit for canceling an on-off impact sound of an audio device as claimed in claim 1, wherein: the power failure detection circuit further comprises a tenth resistor, a third triode and an eleventh resistor, one end of the tenth resistor is connected with a C electrode of the third diode, the other end of the tenth resistor is connected with a B electrode of the third triode, and one end of the eleventh resistor is connected with the B electrode of the third triode; the other end of the eleventh resistor is connected with the E electrode of the third triode, and the C electrode of the third triode is connected with the input end of the trigger circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320800477.2U CN219834379U (en) | 2023-04-11 | 2023-04-11 | Circuit for eliminating startup and shutdown impact sound of audio equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320800477.2U CN219834379U (en) | 2023-04-11 | 2023-04-11 | Circuit for eliminating startup and shutdown impact sound of audio equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219834379U true CN219834379U (en) | 2023-10-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320800477.2U Active CN219834379U (en) | 2023-04-11 | 2023-04-11 | Circuit for eliminating startup and shutdown impact sound of audio equipment |
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| Country | Link |
|---|---|
| CN (1) | CN219834379U (en) |
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2023
- 2023-04-11 CN CN202320800477.2U patent/CN219834379U/en active Active
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