CN210609665U - Vehicle power amplifier mute circuit - Google Patents
Vehicle power amplifier mute circuit Download PDFInfo
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- CN210609665U CN210609665U CN201921929976.1U CN201921929976U CN210609665U CN 210609665 U CN210609665 U CN 210609665U CN 201921929976 U CN201921929976 U CN 201921929976U CN 210609665 U CN210609665 U CN 210609665U
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Abstract
The utility model discloses a vehicle power amplifier mute circuit, which comprises an audio input circuit, a mute delay circuit, a mute control circuit and an audio amplifying circuit; the mute delay circuit comprises a voltage input end BL, a resistor R522A, a resistor R521, a triode Q508, a resistor R522, a photoelectric coupler IC501, a resistor R714 and a reference voltage end GO 1; the MUTE control circuit comprises a triode Q704, a triode Q705, a triode Q701, a capacitor C706, a resistor R709, a resistor R713 and a resistor R717 which are connected with a MUTE signal end MUTE; the resistance of the resistor R709 is larger than the resistance of the resistor R717. Utilize the utility model discloses a circuit has the time delay effect to the silence, reduces the impact of silence in-process.
Description
Technical Field
The utility model relates to a power amplifier silence circuit for vehicle.
Background
When the power amplifier works, no matter the power amplifier is started or started, if the power amplifier is not subjected to mute processing, noise can appear when the power amplifier is started or shut down, and therefore, in order to improve tone quality, a mute circuit is arranged on the power amplifier at present. The power amplifier mute means that the power amplifier is not enabled to work at the moment of starting up, and the power amplifier is enabled to output after being stabilized, most of the prior art sets mute when the power amplifier is started up, and does not set mute function when the power amplifier is shut down, so that low noise can appear when the power amplifier is shut down, and the effect of the power amplifier is not good.
A traditional mute circuit is realized by adopting a triode, and the mute of the triode easily causes mute impact.
Disclosure of Invention
The utility model aims at providing an automobile-used power amplifier silence circuit utilizes the utility model discloses a circuit has the time delay effect to the silence, reduces the impact of silence in-process.
In order to achieve the purpose, the power amplifier mute circuit for the vehicle comprises an audio input circuit, a mute delay circuit, a mute control circuit and an audio amplification circuit;
the output end of the audio input circuit is connected with the mute control circuit;
the mute delay circuit comprises a voltage input end BL, a resistor R522A, a resistor R521, a triode Q508, a resistor R522, a photoelectric coupler IC501, a resistor R714 and a reference voltage end GO 1; the voltage input end BL is connected with the base of the triode Q508 through a resistor R522A; the output end of the resistor R522A is connected with the ground through a resistor R521; the collector of the triode Q508 is connected with the output end of the photoelectric coupler IC501 through a resistor R522; the emitter of the triode Q508 is grounded; the positive electrode of the photoelectric coupler IC501 is connected with a reference voltage end GO1, the collector electrode of the photoelectric coupler IC501 is connected with a MUTE signal end MUTE through a resistor R714, and the emitter electrode of the photoelectric coupler IC501 is grounded;
the MUTE control circuit comprises a triode Q704, a triode Q705, a triode Q701, a capacitor C706, a resistor R709, a resistor R713 and a resistor R717 which are connected with a MUTE signal end MUTE;
the collector of the triode Q704 is connected with the emitter of the triode Q705 through a resistor R717, and the emitter of the triode Q704 is connected with a voltage input end VCR; the base electrode of the triode Q705 is connected with the collector electrode of the triode Q701, and the collector electrode of the triode Q705 is connected with the audio amplifying circuit; the collector of the triode Q701 is connected with the voltage input end VCR through a resistor R709, the base of the triode Q701 is connected with the output end of the audio input circuit, and the emitter of the triode Q701 is connected with the audio amplifying circuit; the capacitor C706 is connected between the MUTE signal terminal MUTE and the voltage input terminal VCR; the resistor R713 is connected between the MUTE signal end MUTE and the voltage input end VCR; the resistance of the resistor R709 is larger than the resistance of the resistor R717.
Further, the audio input circuit comprises an audio input terminal CH5, a resistor R701, a resistor R702, a comparator IC710A, a resistor R703, a capacitor C703, a resistor R709, a resistor R706, a capacitor C704, a resistor R707, and a resistor R708; the audio input end CH5 is connected to the positive electrode of the input end of the comparator IC710A through a resistor R701, the output end of the resistor R701 is grounded through a resistor R702, the negative electrode of the input end of the comparator IC710A is grounded through a resistor R703, meanwhile, a capacitor C703 and a resistor R709 which are mutually connected in parallel are connected between the negative electrode of the input end of the comparator IC710A and the output end of the comparator IC710, a resistor R706 and a resistor R708 are sequentially connected in series at the output end of the comparator IC710A, the output end of the resistor R708 is connected to the base electrode of the triode Q701, and a capacitor C704 and a resistor R707 which are mutually connected in parallel are.
Further, the resistance of the resistor R522A is 220k Ω, the resistance of the resistor R521 is 220k Ω, the resistance of the resistor R522 is 3.3k Ω, and the resistance of the resistor R714 is 47k Ω.
The working principle of the power amplifier mute circuit for the vehicle is as follows: at the moment of starting up, the voltage input end BL supplies power with voltage input end VCR and reference voltage end GO1 simultaneously, and after voltage input end BL supplies power, triode Q508 switches on, and optoelectronic coupler IC 501's positive pole and negative pole switch on, and optoelectronic coupler IC501 is luminous, and at this moment, optoelectronic coupler IC 501's collecting electrode and projecting pole do not switch on, and the voltage of MUTE signal end MUTE loads on triode Q704, and triode Q704 cuts off, and audio amplifier circuit does not output signal, is in the MUTE state. With the increase of the light emitting time of the photocoupler IC501, when the light emitting time reaches the on adjustment of the photocoupler IC501, the photocoupler IC501 is turned on, the MUTE signal terminal MUTE is grounded, at this time, the transistor Q704 is turned on, the transistor Q705 and the transistor Q701 are turned on, and the audio signal in the audio input circuit is amplified and output through the MUTE control circuit and the audio amplifying circuit.
Therefore, the mute delay is realized by disconnecting the coupler, and the impact in the mute process is reduced.
Drawings
Fig. 1 is a schematic diagram of a power amplifier mute circuit for a vehicle.
Fig. 2 is an enlarged view of R in fig. 1.
Fig. 3 is an enlarged view of S in fig. 1.
Fig. 4 is an enlarged view of T in fig. 1.
Fig. 5 is an enlarged view of U in fig. 1.
Fig. 6 is an enlarged view of V in fig. 1.
Fig. 7 is an enlarged view of P in fig. 1.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
In this embodiment, for the sake of clarity of the overall circuit schematic device and notation of fig. 1, the parts of the circuit diagram are enlarged in fig. 2-7, respectively. In fig. 2 to 7, a, b, c, d, e, f, g, h, i, j, k, m, n, o, p, and q are used to clearly connect the circuit portions.
As shown in fig. 1, the power amplifier mute circuit for a vehicle includes an audio input circuit 11, a mute delay circuit 12, a mute control circuit 13 and an audio amplification circuit 14.
As shown in fig. 1 and fig. 2, the audio input circuit 11 includes an audio input terminal CH5, a resistor R701, a resistor R702, a comparator IC710A, a resistor R703, a capacitor C703, a resistor R709, a resistor R706, a capacitor C704, a resistor R707, and a resistor R708; the audio input end CH5 is connected to the positive electrode of the input end of the comparator IC710A through a resistor R701, the output end of the resistor R701 is grounded through a resistor R702, the negative electrode of the input end of the comparator IC710A is grounded through a resistor R703, meanwhile, a capacitor C703 and a resistor R709 which are mutually connected in parallel are connected between the negative electrode of the input end of the comparator IC710A and the output end of the comparator IC710, a resistor R706 and a resistor R708 are sequentially connected in series at the output end of the comparator IC710A, the output end of the resistor R708 is connected to the base electrode of the triode Q701, and a capacitor C704 and a resistor R707 which are mutually connected in parallel are.
As shown in fig. 1 and fig. 3, the mute delay circuit 12 includes a voltage input end BL, a resistor R522A, a resistor R521, a transistor Q508, a resistor R522, a photocoupler IC501, a resistor R714, and a reference voltage end GO 1; the voltage input end BL is connected with the base of the triode Q508 through a resistor R522A; the output end of the resistor R522A is connected with the ground through a resistor R521; the collector of the triode Q508 is connected with the output end of the photoelectric coupler IC501 through a resistor R522; the emitter of the triode Q508 is grounded; the positive electrode of the photoelectric coupler IC501 is connected to a reference voltage terminal GO1, the collector of the photoelectric coupler IC501 is connected to a MUTE signal terminal MUTE through a resistor R714, and the emitter of the photoelectric coupler IC501 is grounded.
The resistance of the resistor R522A is 220k Ω, the resistance of the resistor R521 is 220k Ω, the resistance of the resistor R522 is 3.3k Ω, and the resistance of the resistor R714 is 47k Ω.
As shown in fig. 1 and 4, the MUTE control circuit includes a transistor Q704, a transistor Q705, a transistor Q701, a capacitor C706, a resistor R709, a resistor R713, and a resistor R717, which are connected to the MUTE signal terminal MUTE.
The collector of the triode Q704 is connected with the emitter of the triode Q705 through a resistor R717, and the emitter of the triode Q704 is connected with a voltage input end VCR; the base electrode of the triode Q705 is connected with the collector electrode of the triode Q701, and the collector electrode of the triode Q705 is connected with the audio amplifying circuit; the collector of the triode Q701 is connected with the voltage input end VCR through a resistor R709, the base of the triode Q701 is connected with the output end of the audio input circuit, and the emitter of the triode Q701 is connected with the audio amplifying circuit; the capacitor C706 is connected between the MUTE signal terminal MUTE and the voltage input terminal VCR; the resistor R713 is connected between the MUTE signal end MUTE and the voltage input end VCR; the resistance of the resistor R709 is larger than the resistance of the resistor R717.
As shown in fig. 5 to 7, the audio amplifier circuit includes: the collector of the transistor Q704 is connected to the emitter of the transistor Q712 via a resistor R722 and the resistor R717, the collector of the transistor Q712 is connected to the base of the transistor Q713 via a capacitor C709, and the collector of the transistor Q712 is connected to the inductor L701 via a resistor R723.
The emitter of the transistor Q713 is connected to the inductor L701, the emitter of the transistor Q713 is connected to the collector of the transistor Q709, the collector of the transistor Q713 is connected to the emitter of the transistor Q718 through the resistor R720, the emitter of the transistor Q709 is connected to the first amplifying circuit 111, and the output of the first amplifying circuit 111 is connected to the inductor L701.
The collector of the triode Q705 is connected with the output end of the audio through a resistor R718 and an inductor L701, and the collector of the triode Q705 is connected with the bases of the triode Q708 and the triode Q709; the collector of the transistor Q718 is connected to the voltage input terminal VCR, and the emitter of the transistor Q718 is connected to the resistor R720.
A resistor R712 is connected between the resistor R709 and the voltage input end VCR, the output end of the resistor R712 is connected to the base electrode of the triode Q706, meanwhile, the output end of the resistor R712 is connected to the collector electrode of the triode Q702, the collector electrode of the triode Q702 is connected with the base electrode of the triode Q712, the emitter electrode of the triode Q706 is connected with the emitter electrode of the triode Q705, the collector electrode of the triode Q706 is connected with the emitter electrode of the triode Q707, the emitter electrode of the triode Q702 is connected with the emitter electrode of the triode Q701, and the base electrode of the triode Q702 is connected with the ground; the base electrode of the triode Q703 is connected with a-VCC end through a capacitor C705 and a voltage stabilizing diode D702 which are mutually connected in parallel, the-VCC end is connected with the ground, the collector electrode of the triode Q703 is connected with the emitter electrode of the triode Q701, and the emitter electrode of the triode Q703 is grounded through a resistor R712A; the base of the triode Q707 is grounded through a resistor R716, the collector of the triode Q707 is grounded through a resistor R719, meanwhile, the collector of the triode Q707 is connected to the bases of the triode Q710 and the triode Q711, the collector of the triode Q710 is grounded, the emitter of the triode Q710 is connected to the second amplifying circuit through a resistor R721, the collector of the triode Q711 is grounded, and the emitter of the triode Q711 is connected to the second amplifying circuit 112.
The first amplifying circuit and the second amplifying circuit are conventional amplifying circuits as shown in fig. 7, and therefore, are not described in detail.
The working principle of the power amplifier mute circuit for the vehicle is as follows: at the moment of starting up, the voltage input end BL supplies power with voltage input end VCR and reference voltage end GO1 simultaneously, and after voltage input end BL supplies power, triode Q508 switches on, and optoelectronic coupler IC 501's positive pole and negative pole switch on, and optoelectronic coupler IC501 is luminous, and at this moment, optoelectronic coupler IC 501's collecting electrode and projecting pole do not switch on, and the voltage of MUTE signal end MUTE loads on triode Q704, and triode Q704 cuts off, and audio amplifier circuit does not output signal, is in the MUTE state. With the increase of the light emitting time of the photocoupler IC501, when the light emitting time reaches the on adjustment of the photocoupler IC501, the photocoupler IC501 is turned on, the MUTE signal terminal MUTE is grounded, at this time, the transistor Q704 is turned on, the transistor Q705 and the transistor Q701 are turned on, and the audio signal in the audio input circuit is amplified and output through the MUTE control circuit and the audio amplifying circuit. Therefore, the mute delay is realized by disconnecting the coupler, and the impact in the mute process is reduced.
Claims (3)
1. The utility model provides a power amplifier silence circuit for vehicle which characterized in that: the mute control circuit comprises an audio input circuit, a mute delay circuit, a mute control circuit and an audio amplifying circuit;
the output end of the audio input circuit is connected with the mute control circuit;
the mute delay circuit comprises a voltage input end BL, a resistor R522A, a resistor R521, a triode Q508, a resistor R522, a photoelectric coupler IC501, a resistor R714 and a reference voltage end GO 1; the voltage input end BL is connected with the base of the triode Q508 through a resistor R522A; the output end of the resistor R522A is connected with the ground through a resistor R521; the collector of the triode Q508 is connected with the output end of the photoelectric coupler IC501 through a resistor R522; the emitter of the triode Q508 is grounded; the positive electrode of the photoelectric coupler IC501 is connected with a reference voltage end GO1, the collector electrode of the photoelectric coupler IC501 is connected with a MUTE signal end MUTE through a resistor R714, and the emitter electrode of the photoelectric coupler IC501 is grounded;
the MUTE control circuit comprises a triode Q704, a triode Q705, a triode Q701, a capacitor C706, a resistor R709, a resistor R713 and a resistor R717 which are connected with a MUTE signal end MUTE;
the collector of the triode Q704 is connected with the emitter of the triode Q705 through a resistor R717, and the emitter of the triode Q704 is connected with a voltage input end VCR; the base electrode of the triode Q705 is connected with the collector electrode of the triode Q701, and the collector electrode of the triode Q705 is connected with the audio amplifying circuit; the collector of the triode Q701 is connected with the voltage input end VCR through a resistor R709, the base of the triode Q701 is connected with the output end of the audio input circuit, and the emitter of the triode Q701 is connected with the audio amplifying circuit; the capacitor C706 is connected between the MUTE signal terminal MUTE and the voltage input terminal VCR; the resistor R713 is connected between the MUTE signal end MUTE and the voltage input end VCR; the resistance of the resistor R709 is larger than the resistance of the resistor R717.
2. The muting circuit of the vehicular power amplifier according to claim 1, characterized in that: the audio input circuit comprises an audio input end CH5, a resistor R701, a resistor R702, a comparator IC710A, a resistor R703, a capacitor C703, a resistor R709, a resistor R706, a capacitor C704, a resistor R707 and a resistor R708; the audio input end CH5 is connected to the positive electrode of the input end of the comparator IC710A through a resistor R701, the output end of the resistor R701 is grounded through a resistor R702, the negative electrode of the input end of the comparator IC710A is grounded through a resistor R703, meanwhile, a capacitor C703 and a resistor R709 which are mutually connected in parallel are connected between the negative electrode of the input end of the comparator IC710A and the output end of the comparator IC710, a resistor R706 and a resistor R708 are sequentially connected in series at the output end of the comparator IC710A, the output end of the resistor R708 is connected to the base electrode of the triode Q701, and a capacitor C704 and a resistor R707 which are mutually connected in parallel are.
3. The muting circuit of the vehicular power amplifier according to claim 1, characterized in that: the resistance of the resistor R522A is 220k Ω, the resistance of the resistor R521 is 220k Ω, the resistance of the resistor R522 is 3.3k Ω, and the resistance of the resistor R714 is 47k Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921929976.1U CN210609665U (en) | 2019-11-08 | 2019-11-08 | Vehicle power amplifier mute circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921929976.1U CN210609665U (en) | 2019-11-08 | 2019-11-08 | Vehicle power amplifier mute circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210609665U true CN210609665U (en) | 2020-05-22 |
Family
ID=70686794
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921929976.1U Active CN210609665U (en) | 2019-11-08 | 2019-11-08 | Vehicle power amplifier mute circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210609665U (en) |
-
2019
- 2019-11-08 CN CN201921929976.1U patent/CN210609665U/en active Active
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