CN214591944U - A kind of audio audio limiting circuit - Google Patents
A kind of audio audio limiting circuit Download PDFInfo
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- CN214591944U CN214591944U CN202121004360.0U CN202121004360U CN214591944U CN 214591944 U CN214591944 U CN 214591944U CN 202121004360 U CN202121004360 U CN 202121004360U CN 214591944 U CN214591944 U CN 214591944U
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- 230000000670 limiting effect Effects 0.000 title claims abstract description 11
- 230000005236 sound signal Effects 0.000 claims abstract description 19
- 230000003321 amplification Effects 0.000 claims abstract description 4
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 4
- 239000003990 capacitor Substances 0.000 claims description 15
- 230000005669 field effect Effects 0.000 claims description 7
- 230000009931 harmful effect Effects 0.000 abstract description 2
- 238000010009 beating Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
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Abstract
The utility model relates to a stereo set technical field especially relates to an audio frequency amplitude limiting circuit of stereo set. It includes: a receiving end for the audio signal; an amplifying circuit for amplifying the audio signal; the comparison circuit comprises a comparator U2, and the inverting input end of the comparator U2 receives the output signal of the amplification circuit; the non-inverting input end of the comparator U2 is connected with a reference circuit and receives a reference voltage; the utility model discloses a comparison circuit judges the size of audio frequency, and rethread switch unit control audio output realizes the amplitude limit to the audio frequency, and the whole circuit is simple to implement conveniently, avoids appearing the sound and causes harmful effects greatly.
Description
Technical Field
The utility model relates to a stereo set technical field especially relates to an audio frequency amplitude limiting circuit of stereo set.
Background
With the development of society, square dances are more and more widely accepted by people, and when the square dances are in beating, the sound is generally very big, and the sound disturbs people, and many citizens have made noise complaints; generally, a sound user of square dance cannot actively turn down the volume, so that the sound is turned down during patrol, and the sound is turned up again after the patrol is finished; brings great trouble and trouble to supervision.
Disclosure of Invention
The utility model aims to provide an audio frequency amplitude limiting circuit of a sound box aiming at the defects of the prior art; the audio frequency of the sound can be limited, and the sound size is limited; prevent the sound from being too loud and causing bad influence.
The utility model discloses a realize through following technical scheme:
an audio clipping circuit for a sound, comprising:
a receiving end for the audio signal;
an amplifying circuit for amplifying the audio signal;
the comparison circuit comprises a comparator U2, and the inverting input end of the comparator U2 receives the output signal of the amplification circuit; the non-inverting input end of the comparator U2 is connected with a reference circuit and receives a reference voltage;
the switch unit comprises a control end, an input end and an output end, wherein the input end is connected with the receiving end; the output terminal is connected to ground, and the control terminal is connected to the output terminal of the comparator U2.
Further, the switching unit comprises a field effect transistor Q1, and the output end of the comparator U2 is connected with the gate of the field effect transistor Q1 through a resistor R6, a diode D1 and a resistor R1; the output end of the diode D1 is connected with a bias voltage circuit, the bias voltage circuit comprises a resistor R5 connected with a-15V power supply, a resistor R5 is connected with the output end of the diode D1 through a resistor R4, a resistor R4 is connected with a capacitor C3 in parallel, and one end of the resistor R5 is grounded through a capacitor C4.
Furthermore, the amplifying circuit comprises an operational amplifier U1, an inverting input end of an operational amplifier U1 is connected with a receiving end through a resistor R11, and a capacitor C6 and a resistor R10 which are connected in parallel are connected between the inverting input end of the operational amplifier U1 and an output end of the operational amplifier U1; the non-inverting input of the operational amplifier U1 is grounded.
Preferably, the output terminal of the resistor R11 is connected to ground through a capacitor C7.
Further, the reference circuit comprises a diode D2, a resistor R8 and a resistor R7 which are connected in series, the output end of the resistor 7 is connected with a-15V power supply, the output end of the resistor R8 is connected with the non-inverting input end of a comparator U2, and the resistor R7 or the resistor R8 is a rheostat.
The utility model has the advantages that: the utility model discloses a comparison circuit judges the size of audio frequency, and rethread switch unit control audio output realizes the amplitude limit to the audio frequency, and the whole circuit is simple to implement conveniently, avoids appearing the sound and causes harmful effects greatly.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
Detailed Description
The present invention will be further described with reference to fig. 1 and the following detailed description.
An audio clipping circuit for a sound, comprising:
a receiving end for the audio signal;
an amplifying circuit for amplifying the audio signal;
the comparison circuit comprises a comparator U2, and the inverting input end of the comparator U2 receives the output signal of the amplification circuit; the non-inverting input end of the comparator U2 is connected with a reference circuit and receives a reference voltage;
the switch unit comprises a control end, an input end and an output end, wherein the input end is connected with the receiving end; the output terminal is connected to ground, and the control terminal is connected to the output terminal of the comparator U2.
The technical scheme is applied to the audio signal input of the sound horn; when the audio signal is input, the amplifying circuit amplifies the audio signal, and the amplified audio signal is output to the audio loudspeaker; meanwhile, the voltage is output to the inverting input end of the comparator U2, the non-inverting input end of the comparator U2 receives a reference voltage, the reference voltage is compared with the amplified audio signal voltage, if the reference voltage is higher than the amplified audio signal voltage, a high level is output to the control end of the switch unit, the switch unit forms a passage, the receiving end is grounded, the output of the audio signal is short-circuited, and the audio signal cannot be received by the audio horn, so that the amplitude limiting effect is achieved.
Further, the switching unit comprises a field effect transistor Q1, and the output end of the comparator U2 is connected with the gate of the field effect transistor Q1 through a resistor R6, a diode D1 and a resistor R1; the output end of the diode D1 is connected with a bias voltage circuit, the bias voltage circuit comprises a resistor R5 connected with a-15V power supply, a resistor R5 is connected with the output end of the diode D1 through a resistor R4, a resistor R4 is connected with a capacitor C3 in parallel, and one end of the resistor R5 is grounded through a capacitor C4.
In the technical scheme, the field effect transistor Q2 is used as a switch unit, and a triode can be used as the switch unit. In practical application, when the fet Q1 is used as a switching tube, the current and voltage applied to the gate are proportional to the current and voltage flowing through the fet Q1, and the initial audio signal voltage is low, so that the output voltage of the comparator U2 needs to be reduced. The capacitor C3 and the capacitor C4 both have a filtering effect.
Furthermore, the amplifying circuit comprises an operational amplifier U1, an inverting input end of an operational amplifier U1 is connected with a receiving end through a resistor R11, and a capacitor C6 and a resistor R10 which are connected in parallel are connected between the inverting input end of the operational amplifier U1 and an output end of the operational amplifier U1; the non-inverting input of the operational amplifier U1 is grounded.
Preferably, the output terminal of the resistor R11 is connected to ground through a capacitor C7.
The amplifying circuit amplifies the audio signal; the capacitor C7 filters the audio signal.
Further, the reference circuit comprises a diode D2, a resistor R8 and a resistor R7 which are connected in series, the output end of the resistor 7 is connected with a-15V power supply, the output end of the resistor R8 is connected with the non-inverting input end of a comparator U2, and the resistor R7 or the resistor R8 is a rheostat.
Diode D2 may prevent reverse connection of the circuit; the resistor R7 and the resistor R8 which are connected in series form a voltage division circuit; the intermediate potential of which is the reference voltage. The resistor R7 or the resistor R8 is provided as a rheostat to change the adjustment reference voltage, thereby adjusting the audio clipping.
The above description is only for the preferred embodiment of the present invention, and for those skilled in the art, there are variations on the detailed description and the application scope according to the idea of the present invention, and the content of the description should not be construed as a limitation to the present invention.
Claims (5)
1. An audio frequency amplitude limiting circuit of stereo set which characterized in that: it includes:
a receiving end for the audio signal;
an amplifying circuit for amplifying the audio signal;
the comparison circuit comprises a comparator U2, and the inverting input end of the comparator U2 receives the output signal of the amplification circuit; the non-inverting input end of the comparator U2 is connected with a reference circuit and receives a reference voltage;
the switch unit comprises a control end, an input end and an output end, wherein the input end is connected with the receiving end; the output terminal is connected to ground, and the control terminal is connected to the output terminal of the comparator U2.
2. The audio limiting circuit for a sound of claim 1, wherein: the switching unit comprises a field effect transistor Q1, and the output end of the comparator U2 is connected with the grid electrode of the field effect transistor Q1 through a resistor R6, a diode D1 and a resistor R1; the output end of the diode D1 is connected with a bias voltage circuit, the bias voltage circuit comprises a resistor R5 connected with a-15V power supply, a resistor R5 is connected with the output end of the diode D1 through a resistor R4, a resistor R4 is connected with a capacitor C3 in parallel, and one end of the resistor R5 is grounded through a capacitor C4.
3. The audio limiting circuit for a sound of claim 2, wherein: the amplifying circuit comprises an operational amplifier U1, the inverting input end of an operational amplifier U1 is connected with a receiving end through a resistor R11, and a capacitor C6 and a resistor R10 which are connected in parallel are connected between the inverting input end of the operational amplifier U1 and the output end of the operational amplifier U1; the non-inverting input of the operational amplifier U1 is grounded.
4. The audio limiting circuit for a sound of claim 3, wherein: the output terminal of the resistor R11 is connected to ground through a capacitor C7.
5. The audio limiting circuit for a sound of claim 1, wherein: the reference circuit comprises a diode D2, a resistor R8 and a resistor R7 which are connected in series, the output end of a resistor 7 is connected with a-15V power supply, the output end of the resistor R8 is connected with the non-inverting input end of a comparator U2, and the resistor R7 or the resistor R8 is a rheostat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121004360.0U CN214591944U (en) | 2021-05-12 | 2021-05-12 | A kind of audio audio limiting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121004360.0U CN214591944U (en) | 2021-05-12 | 2021-05-12 | A kind of audio audio limiting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214591944U true CN214591944U (en) | 2021-11-02 |
Family
ID=78329349
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121004360.0U Active CN214591944U (en) | 2021-05-12 | 2021-05-12 | A kind of audio audio limiting circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214591944U (en) |
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2021
- 2021-05-12 CN CN202121004360.0U patent/CN214591944U/en active Active
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