CN213485156U - Circuit for eliminating crackle of analog audio interface - Google Patents
Circuit for eliminating crackle of analog audio interface Download PDFInfo
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- CN213485156U CN213485156U CN202120882270.5U CN202120882270U CN213485156U CN 213485156 U CN213485156 U CN 213485156U CN 202120882270 U CN202120882270 U CN 202120882270U CN 213485156 U CN213485156 U CN 213485156U
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Abstract
The utility model discloses a circuit for eliminating the popping sound of an analog audio interface, which belongs to the technical field of audio interfaces and comprises an audio socket, a detection circuit module and a power amplifier control circuit module which are connected in sequence, wherein the output end of the power amplifier control circuit module is connected with the power amplifier module; the audio socket is an audio socket with a switch, and the working state of the switch in the audio socket is switched according to the plugging and unplugging of the audio line plug; the detection circuit module is used for determining whether an audio line plug is connected according to the working state of a switch in the audio socket; the power amplifier control circuit module is used for controlling the working state of the power amplifier module according to the plugging and unplugging action of the audio line plug. The switch is arranged in the audio socket, the working state of the switch is acquired through the detection circuit module, and whether an audio line plug is inserted or not is determined, so that the power amplifier control module enables the power amplifier module to start working when the audio line plug is inserted, and the problem of noise generated by hot plugging of the sound simulation interface is solved.
Description
Technical Field
The utility model relates to an audio interface technical field especially relates to a circuit of eliminating simulation audio interface crackle.
Background
In current sound products, an analog audio input interface is basically reserved, such as the most common 3.5mm earphone jack. At the stereo set under the power on state, during user's plug audio line, because the contact unreliable of audio line and audio socket is connected, can produce noise signal, through the inside enlargement of audio amplifier, play through the speaker at last, can produce mixed and disorderly noise or produce the plosive, influence user experience very much, can damage the speaker even when serious. In order to solve the technical problem, in the prior art, the volume of the sound box is manually adjusted to be minimum when the audio cable is plugged in and out, or the power supply of the sound box is firstly turned off and then the audio cable is plugged in, but the problem is seriously dependent on the operation habit of a user and is not fundamentally solved.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the unable fundamentally of prior art and solve the noise problem that stereo set analog interface hot plug produced, provide a circuit of eliminating the crackle of analog audio interface.
The purpose of the utility model is realized through the following technical scheme: a circuit for eliminating the popping generated by an analog audio interface comprises an audio socket, a detection circuit module and a power amplifier control circuit module which are connected in sequence, wherein the output end of the power amplifier control circuit module is connected with the power amplifier module; the audio socket is an audio socket with a switch, and the working state of the switch in the audio socket is switched according to the plugging and unplugging of the audio line plug; the detection circuit module is used for determining whether an audio line plug is connected according to the working state of a switch in the audio socket; the power amplifier control circuit module is used for controlling the working state of the power amplifier module according to the plugging and unplugging action of the audio line plug.
As an option, the audio jack includes two contacts, two switches; when the audio line plug is inserted into the audio socket, the audio line plug is respectively in contact connection with the two contacts and the two switches.
As an option, the detection circuit module is specifically an RC charging and discharging circuit submodule.
As an option, the RC charging and discharging circuit submodule includes two RC charging and discharging electronic circuits corresponding to the two switches one to one, the RC charging and discharging electronic circuits include a resistor and a capacitor connected to two ends of the switch, the other end of the resistor is connected to the power supply, and the other end of the capacitor is grounded.
As an option, the RC charging and discharging circuit submodule comprises two paths of RC charging and discharging electronic circuits which are in one-to-one correspondence with the two switches, each RC charging and discharging electronic circuit comprises a resistor and a capacitor which are connected in series, the other end of the resistor is connected to a power supply, and the other end of the capacitor is grounded; one end of a switch in the audio socket is connected between one path of resistor and the capacitor, and the other end of the switch is grounded.
As an option, the power amplifier control circuit module is specifically a power amplifier control circuit module composed of a switch device, or a power amplifier control circuit module composed of a switch device and a control device.
As an option, the power amplifier control circuit module comprises two triodes respectively connected with an RC charging and discharging electronic circuit, a base electrode of the triode is connected with a voltage regulator tube, a cathode of the voltage regulator tube is connected with the RC charging and discharging electronic circuit, an emitting electrode of the triode is grounded, a collector electrode of the triode is connected with a power supply through a pull-up resistor, a diode is connected between the collector electrode of the triode and the pull-up resistor, a cathode of the diode is connected with an enabling end of the power amplifier module, and a grounding resistor is connected between a parallel connection point of cathodes of the two diodes and the enabling end of.
As an option, the power amplifier control circuit module comprises two triodes respectively connected with the RC charging and discharging electronic circuit, bases of the triodes are sequentially connected to the RC charging and discharging electronic circuit through a first resistor and a first diode, emitters of the triodes are grounded, collectors of the triodes are connected with a second diode, an anode of the second diode is connected to an enabling end of the power amplifier module, a second resistor is connected between a junction of an anode of the second diode and the enabling end of the power amplifier module, and the other end of the second resistor is connected with a power supply.
As an option, the power amplifier control circuit module comprises a control device and a triode which are sequentially connected, the input end of the control device is connected with an RC (resistor-capacitor) charging and discharging electronic circuit, the output end of the control device is connected to the base electrode of the triode through a sixth resistor, a seventh resistor is connected between the sixth resistor and the base electrode of the triode, the other end of the seventh resistor is connected to the emitter electrode of the triode, the emitter electrode of the triode is grounded, the collector electrode of the triode is connected with the enabling end of the power amplifier module, a fifth resistor is connected between the collector electrode of the triode and the enabling end of the power amplifier module.
As an option, the circuit for eliminating the popping generated by the analog audio interface further comprises a surge suppression circuit module, and when the audio line plug is inserted into the audio socket, the audio line plug is connected with the surge suppression circuit module.
It should be further noted that the technical features corresponding to the above options can be combined with each other or replaced to form a new technical solution.
Compared with the prior art, the utility model discloses beneficial effect is:
(1) in an example, set up the switch in the audio frequency socket to obtain the operating condition of switch and then confirm whether there is audio line plug to insert through the detection circuitry module, so that power amplifier control module makes power amplifier module begin to work when audio line plug inserts, and then solve the noise problem that stereo set analog interface hot plugging produced, and can effectively protect the impact of power amplifier module of area electric plug, and the user need not to adjust the volume or close power operation when using, high durability and convenient use, user experience is good.
(2) In one example, the RC charging and discharging circuit submodule can detect the working state (open or closed) of a switch in the audio socket and eliminate the jitter generated when the audio line plug is in contact with the audio socket.
(3) In one example, a surge suppression circuit module is arranged for preventing surge signals generated when the audio signal line is connected from being transmitted to the rear-stage circuit to damage the rear-stage circuit.
Drawings
Fig. 1 is a system block diagram of embodiment 1 of the present invention;
fig. 2 is a schematic view of an audio jack according to embodiment 1 of the present invention;
fig. 3 is a schematic circuit diagram of embodiment 1 of the present invention;
fig. 4 is a schematic circuit diagram of embodiment 2 of the present invention;
fig. 5 is a schematic circuit diagram according to embodiment 3 of the present invention.
In the figure: a grounded housing 01, a first contact 021, a second contact 022.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like are the directions or positional relationships indicated on the basis of the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element indicated must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.
The utility model discloses an use the audio frequency socket of taking the switch as audio input interface, combine back level control circuit, the noise signal who produces when can effectively avoiding inserting the audio line plays out through the speaker, solves noise or plosive problem.
Example 1
As shown in fig. 1, in embodiment 1, a circuit for eliminating pop noise of an analog audio interface specifically includes an audio jack, a detection circuit module, and a power amplifier control circuit module, which are connected in sequence, wherein an output end of the power amplifier control circuit module is connected to the power amplifier module; the audio socket is an audio socket with a switch, and the working state of the switch in the audio socket is switched according to the plugging and unplugging of the audio line plug; the detection circuit module is used for determining whether an audio line plug is connected according to the working state of a switch in the audio socket; the power amplifier control circuit module is used for controlling the working state of the power amplifier module according to the plugging and unplugging action of the audio line plug. Specifically, the output end of the power amplifier module is connected with a loudspeaker for playing audio signals. The utility model discloses set up the switch in the audio socket, and obtain the operating condition (closure or disconnection) of switch and then confirm whether audio line plug inserts or extracts through the detection circuitry module, so that power amplifier control module makes the power amplifier module change into operating condition by the standby state when audio line plug inserts, and make the power amplifier module change into standby state by the operating condition when audio line plug extracts, and then effectively avoid the noise that the audio line plug inserted the audio socket in-process and produce noise or pop sound, with this impact of effective protection area electric mortiser to the power amplifier module, and need not to adjust the volume or close the power operation when the user uses, high durability and convenient use, user experience is good; meanwhile, when the audio line plug is not inserted into the audio socket, the power amplifier module is in a standby state, so that the loss can be effectively reduced, and no signal is transmitted into the loudspeaker, so that the loudspeaker cannot generate any bottom noise problem.
Further, as shown in fig. 2, the audio jack includes a grounding shell 01, a first contact 021, a second contact 022, a switch k1, and a switch k2, the grounding shell 01 is grounded via a wire, and the two contacts and the two switches respectively correspond to the two sound channels of the audio line plug. Specifically, the switch of the audio socket is related to the state of the audio line plug connected to the connecting contact, and may be a normally open state or a normally closed state, where the switch is normally open, when no audio line plug is connected to the contact, the switch is open, and when the audio line plug is connected to the contact, the switch is closed; when the audio line plug is inserted into the audio socket, the audio line plug is respectively in contact connection with the two contacts and the two switches, namely the switches in the audio socket are linked with the contact states, and the contact states can be determined through the on-off states of the switches; meanwhile, the switch is not electrically connected with the contact, so that the detection circuit can not introduce any noise influence on the audio signal circuit.
Furthermore, the detection circuit module is specifically an RC charge-discharge circuit submodule, and can detect the working state (open or closed) of a switch in the audio socket, and meanwhile, the RC charge-discharge circuit submodule is in a charging state, so that the jitter generated when the audio line plug is in contact with the audio socket is eliminated.
Furthermore, the RC charge-discharge circuit submodule comprises two RC charge-discharge electronic circuits in one-to-one correspondence with the two switches, each RC charge-discharge electronic circuit comprises a resistor and a capacitor, the resistors are connected to the two ends of each switch, the other ends of the resistors are connected to a power supply, and the other ends of the capacitors are grounded. As shown in fig. 3, after the audio line plug is plugged into the audio jack, the resistors R3 and R4 are connected to the capacitors C1 and C2 through the switches k1 and k2, respectively, and the other ends of the resistors R3 and R4 are connected to the power supply (high level), the capacitors C1 and C2 are both grounded, and when the audio line plug is plugged into the audio jack, the power supply charges the capacitors C1 and C2 through the resistors R3 and R4, thereby determining that the audio line plug is plugged into the audio jack.
Further, the power amplifier control circuit module is specifically a power amplifier control circuit module composed of a switch device, or a power amplifier control circuit module composed of a switch device and a control device. Specifically, the switching device may be a triode, a relay, or the like, and the on/off state of the triode is controlled by changing the voltages of the base electrode, the collector electrode, and the emitter electrode of the triode, so as to be applied as a switch; similarly, the relay signal trigger end level can be controlled by the control device to control the on-off state of the relay signal trigger end, so that the relay signal trigger end level can be used as a switch, the enable end of the power amplifier module is in an effective state or an invalid state, and the power amplifier module can be switched between the working state and the standby state.
Furthermore, the power amplifier control circuit module comprises two triodes respectively connected with the RC charge-discharge electronic circuit, a base electrode of the triode is connected with a voltage-stabilizing tube, a cathode of the voltage-stabilizing tube is connected with the RC charge-discharge electronic circuit, an emitting electrode of the triode is grounded, a collector electrode of the triode is connected with a power supply through a pull-up resistor, a diode is connected between the collector electrode of the triode and the pull-up resistor, a cathode of the diode is connected with an enabling end of the power amplifier module, and a grounding resistor is connected between the junction of the cathodes of the two diodes and the enabling end. As shown in fig. 3, bases of the triodes Q1 and Q2 are connected between the switches k1 and k2 and the capacitors C1 and C2 through the voltage regulators D3 and D4, emitters of the triodes Q1 and Q2 are grounded, collectors of the triodes Q1 and Q2 are connected to the power supply through the resistors R5 and R6, diodes D5 and D6 are connected between the triodes Q1 and Q2 and the pull-up resistors R5 and R6, cathodes of the diodes D5 and D6 are connected to an enabling end of the power amplifier module, and a grounding resistor R7 is connected between a junction of cathodes of the diodes D5 and D6 and the enabling end of the power amplifier module.
Further, the circuit also comprises a surge suppression circuit module, and when the audio line plug is inserted into the audio socket, the audio line plug is connected with the surge suppression circuit module. Specifically, the surge suppression circuit module comprises two paths of resistors and two-way voltage-regulator tubes which are connected in series, the other ends of the resistors are connected with an inserted audio line plug, and the other ends of the two-way voltage-regulator tubes are grounded, as shown in fig. 3, the resistor R1 and the two-way voltage-regulator tube D1 form a surge suppression circuit of the sound channel 1, and the resistor R2 and the two-way voltage-regulator tube D2 form a surge suppression circuit of the sound channel 2, and are used for preventing surge signals generated when an audio signal line is connected from being transmitted to a rear-stage circuit and damaging the rear-stage. More specifically, the surge suppression circuit module is connected to the power amplifier module through the audio processing module, and the power amplifier module is connected to the loudspeaker.
For better understanding of the inventive concept of the present application, the operation principle of the circuit of the present embodiment will now be described:
in this embodiment, the low level of the power amplifier enable terminal is effective. Switches k1 and k2 in the audio socket are linked with socket contacts of the sound channel 1 and the sound channel 2 respectively, the initial state is normally open, and when an audio line plug is inserted into the audio socket, the switches k1 and k2 are closed; particularly, when the audio jack is notWhen an audio line plug is inserted (when the audio line plug is pulled out of an audio socket, the same applies), the switches k1 and k2 are not closed or one is not closed, the voltages of the capacitors C1 and C2 are not enough to drive the triodes Q1 and Q2 through the voltage regulators D3 and D4, one or two of the triodes Q1 and Q2 are not conducted, and the VCC enables the power amplification module through the resistors R5 and R6 and the diodes D5 and D6 (the power amplification module enables the terminals of the power amplifier module to be (the power amplifier module enables the audio line plug to be connected with the audio line plug) (
) The power amplifier is set high, and does not work in a standby state, so that noise cannot be generated; when the audio socket is inserted with the audio line plug, the switches k1 and k2 are closed, and the Vcc charges the capacitors C1 and C2 through the resistors R3 and R4 respectively, and in the process, contact jitter of the audio line plug and the audio socket is eliminated. When the contact is stable, the voltages of the capacitors C1 and C2 reach the switching-on conditions of the triodes Q1 and Q2 after passing through the voltage-stabilizing tubes D3 and D4, the triodes Q1 and Q2 are switched on, the diodes D5 and D6 are switched off after the triodes Q1 and Q2 are switched on, the grounding resistor R7 pulls down the enabling end of the power amplifier, the power amplifier is enabled to work, namely, the power amplifier module starts to work after the audio line plug is inserted into the audio socket, and therefore noise generated in the process of inserting the audio line plug into the audio socket is effectively avoided.
Example 2
The present embodiment has the same inventive concept as embodiment 1, and replaces the circuit forms of the RC charging and discharging circuit sub-module and the power amplifier control circuit module in embodiment 1 on the basis of embodiment 1.
Specifically, the RC charge-discharge circuit submodule comprises two RC charge-discharge electronic circuits which correspond to the two switches one by one, each RC charge-discharge electronic circuit comprises a resistor and a capacitor which are connected in series, the other end of each resistor is connected to a power supply, and the other end of each capacitor is grounded; one end of a switch in the audio socket is connected between one path of resistor and the capacitor, and the other end of the switch is grounded. As shown in fig. 4, the resistor R3 is connected in series with the capacitor C1, and then connected in parallel with the resistor R4 and the capacitor C2 connected in series, the other ends of the resistors R3 and R4 are connected to a power supply (high level), and the capacitors C1 and C2 are both grounded.
Specifically, the power amplifier control circuit module comprises two triodes respectively connected with the RC charge-discharge electronic circuit, the base electrodes of the triodes are sequentially connected to the RC charge-discharge electronic circuit through a first resistor and a first diode, the emitter electrodes of the triodes are grounded, the collector electrodes of the triodes are connected with a second diode, the anode of the second diode is connected to the enabling end of the power amplifier module, a second resistor is connected between the junction of the anode of the second diode and the enabling end of the power amplifier module, and the other end of the second resistor is connected with a power supply. As shown in fig. 4, bases of the triodes Q1 and Q2 are connected with the diodes D5 and D6 through resistors R5 and R6, the diodes D5 and D6 are respectively arranged between the resistor R3 and the capacitor C1, the resistor R4 and the capacitor C2, cathodes of the diodes are connected with bases of the triodes through resistors, emitters of the triodes Q1 and Q2 are grounded, collectors of the triodes Q1 and Q2 are connected with the diodes D7 and D8, anodes of the diodes D7 and D8 are connected to an enabling end of the power amplification module, a resistor R7 is connected between a junction of anodes of the diodes D7 and D8 and the enabling end of the power amplification module, and the other end of the resistor R7 is connected to a power supply.
For better understanding of the inventive concept of the present application, the operation principle of the circuit of the present embodiment will now be described:
in this embodiment, the high level of the power amplifier enable terminal is active. Switches k1 and k2 in the audio socket are linked with socket contacts of the sound channel 1 and the sound channel 2 respectively, the initial state is normally open, and when an audio line plug is inserted into the audio socket, the switches k1 and k2 are closed; specifically, when no audio line plug is inserted into the audio jack, the switches k1 and k2 are turned off, the VCC charges the capacitors C1 and C2 through the resistors R3 and R4, the triodes Q1 and Q2 are driven to be turned on through the diodes D5, D6, the resistors R5 and R6, the enabling end of the power amplifier module is grounded, and the power amplifier module stops working (is in a standby state) without generating noise; when an audio line plug is inserted into the audio socket, the connection points of the switches k1 and k2, namely the closed resistors R3 and R4 and the diodes D5 and D6 are set to be low, the capacitors C1 and C2 discharge through the resistors R5 and R6 and the bases of the triodes Q1 and Q2, the triodes Q1 and Q2 are turned off after discharging is finished, the power amplifier enabling end is set to be high through the resistor R7 by VCC, enabling operation is achieved, namely the power amplifier module starts to operate after the audio line plug is inserted into the audio socket, and therefore noise generated in the process of inserting the audio line plug into the audio socket is effectively avoided.
Example 3
The present embodiment has the same inventive concept as embodiment 1, and replaces the circuit form of the power amplifier control circuit module in embodiment 1 on the basis of embodiment 1.
Specifically, as shown in fig. 5, the power amplifier control circuit module includes a control device (MCU) and a transistor sequentially connected, and an input end of the control device is connected to the RC charging and discharging electronic circuit, that is, two input ends (I/O) of the control device are respectively connected between a switch k1 and a capacitor C1, and between a switch k2 and a capacitor C2; the output end of the control device is connected to the base of a triode Q1 through a sixth resistor R6, a seventh resistor R7 is connected between the base of the triode Q1 and the sixth resistor R6, the other end of the seventh resistor R7 is connected to the emitter of a triode Q1, the emitter of the triode Q1 is grounded, the collector of the triode Q1 is connected with the enabling end of a power amplification module, a fifth resistor R5 is connected between the collector of the triode Q1 and the enabling end of the power amplification module, and the other end of the fifth resistor R5 is connected with a power supply VCC2And the MCU can be used for detecting the voltages on the capacitors C1 and C2 so as to judge the closing states of the switches k1 and k2, thereby controlling the working state of the triode and further controlling the working state of the power amplifier module.
The above detailed description is the detailed description of the present invention, and it can not be considered that the detailed description of the present invention is limited to these descriptions, and to the ordinary skilled person in the art to which the present invention belongs, without departing from the concept of the present invention, a plurality of simple deductions and replacements can be made, which should be regarded as belonging to the protection scope of the present invention.
Claims (10)
1. A circuit for eliminating the popping sound of an analog audio interface is characterized in that: the audio socket, the detection circuit module and the power amplifier control circuit module are connected in sequence, and the output end of the power amplifier control circuit module is connected with the power amplifier module;
the audio socket is an audio socket with a switch, and the working state of the switch in the audio socket is switched according to the plugging and unplugging of the audio line plug; the detection circuit module is used for determining whether an audio line plug is connected according to the working state of a switch in the audio socket; the power amplifier control circuit module is used for controlling the working state of the power amplifier module according to the plugging and unplugging action of the audio line plug.
2. The circuit for canceling pop at an analog audio interface of claim 1, wherein: the audio socket comprises two contacts and two switches; when the audio line plug is inserted into the audio socket, the audio line plug is respectively in contact connection with the two contacts and the two switches.
3. The circuit for canceling pop at an analog audio interface of claim 2, wherein: the detection circuit module is specifically an RC charge-discharge circuit submodule.
4. The circuit for canceling pop at an analog audio interface of claim 3, wherein: the RC charge-discharge circuit submodule comprises two RC charge-discharge electronic circuits which correspond to the two switches one by one, the RC charge-discharge electronic circuits comprise resistors and capacitors connected to the two ends of the switches, the other ends of the resistors are connected to a power supply, and the other ends of the capacitors are grounded.
5. The circuit for canceling pop at an analog audio interface of claim 3, wherein: the RC charge-discharge circuit submodule comprises two RC charge-discharge electronic circuits which correspond to the two switches one by one, each RC charge-discharge electronic circuit comprises a resistor and a capacitor which are connected in series, the other end of each resistor is connected to a power supply, and the other end of each capacitor is grounded; one end of a switch in the audio socket is connected between one path of resistor and the capacitor, and the other end of the switch is grounded.
6. The circuit for canceling pop at an analog audio interface of claim 1, wherein: the power amplifier control circuit module is specifically a power amplifier control circuit module composed of a switch device, or a power amplifier control circuit module composed of a switch device and a control device.
7. The circuit for canceling pop at an analog audio interface of claim 6, wherein: the power amplifier control circuit module comprises two triodes respectively connected with an RC charge-discharge electronic circuit, a triode base is connected with a voltage-stabilizing tube, a cathode of the voltage-stabilizing tube is connected with the RC charge-discharge electronic circuit, an emitting electrode of the triode is grounded, a collector electrode of the triode is connected with a power supply through a pull-up resistor, a diode is connected between the collector electrode of the triode and the pull-up resistor, a cathode of the diode is connected with an enabling end of the power amplifier module, and a grounding resistor is connected between a junction of two cathodes of the diode and the enabling end of the power.
8. The circuit for canceling pop at an analog audio interface of claim 6, wherein: the power amplifier control circuit module comprises two triodes respectively connected with the RC charge-discharge electronic circuit, the base electrodes of the triodes are sequentially connected to the RC charge-discharge electronic circuit through a first resistor and a first diode, the emitter electrodes of the triodes are grounded, the collector electrodes of the triodes are connected with a second diode, the anode of the second diode is connected to the enabling end of the power amplifier module, a second resistor is connected between the junction of the anode of the second diode and the enabling end of the power amplifier module, and the other end of the second resistor is connected with a power supply.
9. The circuit for canceling pop at an analog audio interface of claim 6, wherein: the power amplifier control circuit module comprises a connecting control device and a triode in sequence, the input end of the control device is connected with an RC (resistor-capacitor) charging and discharging electronic circuit, the output end of the control device is connected to a base electrode of the triode through a sixth resistor, a seventh resistor is connected between the sixth resistor and the base electrode of the triode, the other end of the seventh resistor is connected to an emitting electrode of the triode, the emitting electrode of the triode is grounded, a collector electrode of the triode is connected with an enabling end of the power amplifier module, a fifth resistor is connected between the collector electrode of the triode and the enabling end of the power amplifier module.
10. The circuit for canceling pop at an analog audio interface of claim 1, wherein: the audio line plug is connected with the surge suppression circuit module when the audio line plug is inserted into the audio socket.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120882270.5U CN213485156U (en) | 2021-04-27 | 2021-04-27 | Circuit for eliminating crackle of analog audio interface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120882270.5U CN213485156U (en) | 2021-04-27 | 2021-04-27 | Circuit for eliminating crackle of analog audio interface |
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| CN213485156U true CN213485156U (en) | 2021-06-18 |
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| CN202120882270.5U Active CN213485156U (en) | 2021-04-27 | 2021-04-27 | Circuit for eliminating crackle of analog audio interface |
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