CN215345045U - Squelch circuit with standby playback source function - Google Patents
Squelch circuit with standby playback source function Download PDFInfo
- Publication number
- CN215345045U CN215345045U CN202121184425.4U CN202121184425U CN215345045U CN 215345045 U CN215345045 U CN 215345045U CN 202121184425 U CN202121184425 U CN 202121184425U CN 215345045 U CN215345045 U CN 215345045U
- Authority
- CN
- China
- Prior art keywords
- source
- relay
- voltage
- triode
- sound
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000003990 capacitor Substances 0.000 claims description 14
- 238000004519 manufacturing process Methods 0.000 abstract description 15
- 238000001914 filtration Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
Images
Landscapes
- Amplifiers (AREA)
Abstract
The utility model discloses a squelch circuit with a standby playback source function, which comprises a sound production unit, a relay, a standby playback power signal output source and a signal sound source, the triode, electric capacity and rectifier diode, the input of sound production unit is connected with the movable contact of relay, the normally open contact of relay is connected with the output that is equipped with the power signal output source of putting, the normally closed contact of relay is connected with the output of signal sound source, the first feed end of relay respectively with rectifier diode's negative pole, the one end of electric capacity is connected, the other end ground connection of electric capacity, rectifier diode's positive pole is used for being connected with first voltage source, the second feed end of relay is connected with the collecting electrode of triode, the projecting pole ground connection of triode, the base of triode is used for being connected with the second voltage source, the voltage that first voltage source provided the triode is greater than the voltage that the second voltage source provided to the triode base. The utility model can well reduce or inhibit noise when the circuit is switched on and switched off, and has simple circuit and low cost.
Description
Technical Field
The utility model relates to the technical field of squelch circuits, in particular to a squelch circuit with a standby playback source function.
Background
When a sound generating device such as a general speaker, a sound box, or a stereo is turned on or off, noise such as current noise is often accompanied with the sound, and therefore, the sound generating device often suppresses or reduces the accompanying noise when turned on or off according to a muting circuit. However, the existing squelch circuit is often complex in design and includes many electronic components, resulting in high cost, complex circuit and difficult maintenance. Meanwhile, the existing muting circuit often only has a muting function, so that when a signal sound source is turned off, the sound production unit is often in a silent state due to no sound source input, and noise is amplified. Therefore, a low-cost and simplified squelch circuit is needed to play back the backup audio source.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects of the prior art, the utility model provides a squelch circuit with a standby sound source function, which can solve the problems of noise reduction and standby sound source when a sound production unit is started and stopped.
The technical scheme for realizing the purpose of the utility model is as follows: a squelch circuit with standby power supply function comprises a sound generating unit, a relay JK1, a standby power signal output source, a signal sound source, a triode Q1, a capacitor C1 and a rectifier diode D1, wherein the input end of the sound generating unit is connected with a movable contact of the relay JK1, a normally open contact of the relay JK1 is connected with the output end of the standby power signal output source, a normally closed contact of the relay JK1 is connected with the output end of the signal sound source,
the first power supply end of the relay JK1 is respectively connected with the cathode of the rectifier diode D1 and one end of the capacitor C1, the other end of the capacitor C1 is grounded, the anode of the rectifier diode D1 is used for being connected with a first voltage source,
the second power supply end of the relay JK1 is connected with the collector of a triode Q1, the emitter of the triode Q1 is grounded, the base of the triode Q1 is used for being connected with a second voltage source,
the first voltage source provides a voltage to transistor Q1 that is greater than the voltage provided by the second voltage source to the base of transistor Q1.
Furthermore, a normally open contact of the relay JK1 is connected with an audio transformer in series and then is connected with an output end of a standby power signal output source.
Furthermore, a normally closed contact of the relay JK1 is connected with an active power amplifier in series and then is connected with an output end of a signal sound source.
Further, the first voltage source is an internal voltage source or an external voltage source.
Furthermore, a second voltage source is connected in series with a resistor R1 and the base of a triode Q1, and the resistor R1 is a current-limiting protection resistor.
Further, still include bluetooth module, bluetooth module is connected with active power amplifier's input, and bluetooth module is used for inputting the sound source to sound production unit.
Further, the bluetooth module is connected to the base of transistor Q1, and the bluetooth module is used to replace the second voltage source and provide the enable voltage to transistor Q1.
Further, the transistor Q1 is an NPN transistor.
The utility model has the beneficial effects that: the utility model can well reduce or inhibit noise when the circuit is switched on and switched off, and can provide the standby sound source for playing.
Drawings
Fig. 1 is a schematic diagram of the circuit structure of the present invention.
Detailed Description
The utility model is further described with reference to the accompanying drawings and the specific embodiments.
As shown in fig. 1, a squelch circuit with a standby power source function includes a sound generating unit, a relay JK1, an audio transformer, a standby power signal output source, an active power amplifier, a signal sound source, a bluetooth module, a resistor R1, a triode Q1, a capacitor C1, a rectifier diode D1 and a voltage source. The sound production unit can be a loudspeaker, a sound box or other equipment capable of playing sound, the input end of the sound production unit is connected with the movable contact of the relay JK1, the normally open contact of the relay JK1 is connected with the output end of the audio transformer, and the normally closed contact of the relay JK1 is connected with the output end of the active power amplifier.
The input end of the audio transformer is connected with the output end of the standby amplifier power signal output source, the standby amplifier power signal output source provides a standby amplifier sound source for the sound production unit when being used for closing the signal sound source output sound source, and the audio transformer is used for adjusting the voltage of the standby amplifier sound source so as to meet the requirement that the sound production unit plays the working voltage of the standby amplifier sound source.
The input of active power amplifier is connected with the output of signal sound source, bluetooth module's output respectively, and the signal sound source is used for the required sound source of broadcast sound to the sound production unit input, and the active power amplifier is used for carrying out the input after the power amplifier for the sound source of signal sound source output and gives the sound production unit.
Preferably, the voltage source may adopt an external voltage source or an internal voltage source, that is, may or may not need a self-contained voltage source. When an external voltage source is used, the external voltage source is connected to the anode of the diode D1, and when an internal voltage source is used, the internal voltage source is fixedly connected to and integrated with the diode D1. The bluetooth module may also provide the enable voltage to the transistor Q1 via the resistor R1, or may alternatively provide the enable voltage to the transistor Q1 from an onboard voltage source or an external voltage source. The voltage source provides a higher voltage to the collector of transistor Q1 than the bluetooth model provides an enable voltage to the base of transistor Q1.
A first power supply terminal of the relay JK1 is connected to a negative electrode of the rectifier diode D1 and one terminal of the capacitor C1, respectively, the other terminal of the capacitor C1 is grounded, and the capacitance value of the capacitor C1 is preferably 47 μ F. The anode of the rectifying diode D1 is connected to a voltage source. The voltage source is preferably 17 vac.
The second supply end of relay JK1 is connected with triode Q1's collecting electrode, triode Q1's projecting pole ground connection, and base series resistance R1 of triode Q1 back is connected with bluetooth module's IO output.
Pins 1-5 of the relay JK1 are respectively a first power supply end, a second power supply end, a movable contact, a normally open contact and a normally closed contact.
The working principle is as follows: when the voltage source starts to supply power (namely, the sounding unit is started), the circuit outputs direct-current voltage after passing through a rectifying and filtering circuit formed by a rectifying diode D1 and a capacitor C1, and the direct-current voltage supplies power to the relay JK1 through the first power supply end. Meanwhile, the power supply of the Bluetooth module is also used for normally supplying power outwards, and after the Bluetooth module meets the working condition, the IO pin of the Bluetooth module provides enabling voltage to the triode Q1 through the resistor R1, so that the triode Q1 is conducted. The movable contact and the normally closed contact of the relay JK1 are changed into the closed state from the original open state due to the conduction of the triode Q1, and the movable contact and the normally open contact of the relay JK1 are changed into the open state from the original closed state. That is, the movable contact (pin No. 3) and the normally closed contact (pin No. 5) of the relay JK1 are switched on from the partition, and the movable contact and the normally open contact (pin No. 4) are switched off from the conduction. Thereby make signal source or bluetooth module through relay JK1 to sound production unit input sound source behind the active power amplifier, sound production unit broadcast sound source, sound production unit can normally sound. Wherein, signal sound source and bluetooth module all can be through active power amplifier to sound production unit input sound source. When the voltage source stops supplying power (namely, the sounding unit is closed), the relay JK1 is powered off, so that the movable contact (pin No. 3) and the normally closed contact (pin No. 5) of the relay JK1 become disconnected, the movable contact and the normally open contact (pin No. 4) become connected, the signal sound source stops inputting the sound source to the sounding unit, the standby power signal output source provides the sound source instead, namely, in the process of closing the sounding unit, the standby sound source is provided by a backup, and the sounding unit realizes the standby sound source. It should be noted that the sound source provided by the auxiliary power signal output source may be the same as or different from the sound source provided by the signal sound source.
The resistor R1 plays a role in current limiting protection, namely a current limiting protection resistor, the triode Q1 is an NPN type triode, and the capacitor C1 plays a role in filtering and delaying. The capacitor C1 is determined by its capacity to discharge for a time, which affects the voltage provided to the relay JK 1. Assuming that during the power-down (i.e. turning off the power transmission to the outside) of the voltage source, the relay JK1 would still be in on-state operation at an extreme time without the action of the capacitor C1, so that the noise source would be transmitted to the sound generating unit through the relay JK1 to cause pop noise.
The embodiments disclosed in this description are only an exemplification of the single-sided characteristics of the utility model, and the scope of protection of the utility model is not limited to these embodiments, and any other functionally equivalent embodiments fall within the scope of protection of the utility model. Various other changes and modifications to the above-described embodiments and concepts may occur to those skilled in the art, and all such changes and modifications are intended to be included within the scope of the present invention as defined in the appended claims.
Claims (8)
1. A squelch circuit with standby power supply function is characterized in that the squelch circuit comprises a sound generating unit, a relay JK1, a standby power signal output source, a signal sound source, a triode Q1, a capacitor C1 and a rectifier diode D1, wherein the input end of the sound generating unit is connected with a movable contact of the relay JK1, a normally open contact of the relay JK1 is connected with the output end of the standby power signal output source, a normally closed contact of the relay JK1 is connected with the output end of the signal sound source,
the first power supply end of the relay JK1 is respectively connected with the cathode of the rectifier diode D1 and one end of the capacitor C1, the other end of the capacitor C1 is grounded, the anode of the rectifier diode D1 is used for being connected with a first voltage source,
the second power supply end of the relay JK1 is connected with the collector of a triode Q1, the emitter of the triode Q1 is grounded, the base of the triode Q1 is used for being connected with a second voltage source,
the first voltage source provides a voltage to transistor Q1 that is greater than the voltage provided by the second voltage source to the base of transistor Q1.
2. The muting circuit with the function of the standby power source according to claim 1, characterized in that the normally open contact of the relay JK1 is connected in series with the audio transformer and then connected with the output terminal of the standby power signal output source.
3. The muting circuit with the function of the backup sound source according to claim 1, characterized in that the normally closed contact of the relay JK1 is connected in series with the active power amplifier and then connected with the output of the signal sound source.
4. The muting circuit with a standby source function according to claim 1, characterized in that the first voltage source is an internal voltage source or an external voltage source.
5. The muting circuit with the function of a backup sound source according to claim 1, characterized in that the second voltage source is connected in series with a resistor R1 and the base of a transistor Q1 is connected, the resistor R1 being a current limiting protection resistor.
6. The muting circuit with the function of backing up a sound source according to claim 1, further comprising a bluetooth module, wherein the bluetooth module is connected to the input terminal of the active power amplifier, and the bluetooth module is used to input a sound source to the sound unit.
7. The muting circuit with standby source function according to claim 6, characterized in that the bluetooth module is connected to the base of transistor Q1, and is arranged to replace the second voltage source for providing an enabling voltage to transistor Q1.
8. The muting circuit with the function of a backup source according to claim 1, characterized in that the transistor Q1 is an NPN-type transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121184425.4U CN215345045U (en) | 2021-05-28 | 2021-05-28 | Squelch circuit with standby playback source function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121184425.4U CN215345045U (en) | 2021-05-28 | 2021-05-28 | Squelch circuit with standby playback source function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215345045U true CN215345045U (en) | 2021-12-28 |
Family
ID=79549185
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121184425.4U Active CN215345045U (en) | 2021-05-28 | 2021-05-28 | Squelch circuit with standby playback source function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215345045U (en) |
-
2021
- 2021-05-28 CN CN202121184425.4U patent/CN215345045U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2091145B1 (en) | Pop noise suppression apparatus and audio output system utilizing the same | |
| GB1452564A (en) | Hearing aid control circuit | |
| CN106878872B (en) | Peripheral circuit for eliminating noise signal | |
| CN100546186C (en) | Mute circuit for open and close | |
| CN103974171A (en) | Plosive cancelling circuit | |
| CN203933898U (en) | A kind of VGA CARD is eliminated circuit and active noise reduction earphone | |
| JP2012023726A (en) | Mute control circuit and electronic device having the same | |
| CN215345045U (en) | Squelch circuit with standby playback source function | |
| CN103458342A (en) | Circuit eliminating shutdown POP sound of audio power amplifier | |
| CN113434112B (en) | Audio product on-off and loudspeaker mute protector and control method | |
| CN203435137U (en) | Circuit for eliminating shutdown POP sound of audio power amplifier | |
| CN201403188Y (en) | POP noise suppression circuit | |
| CN101335500A (en) | Method and circuit for eliminating breaking sound of audio circuit | |
| CN211321491U (en) | Circuit for eliminating power-down noise of audio equipment | |
| CN203104756U (en) | Mute circuit during turning on and off | |
| CN203912161U (en) | Noise eliminating circuit | |
| CN214014505U (en) | Circuit for eliminating POP sound of audio equipment | |
| CN215420725U (en) | Automatic shutdown circuit of sound system | |
| CN217486641U (en) | Power-on and power-off delay mute circuit and audio playing device | |
| CN217088135U (en) | Digital power amplifier sound box instant power-off automatic compensation control circuit | |
| CN218162828U (en) | Mute circuit | |
| CN221043202U (en) | Audio circuit and Bluetooth sound box | |
| CN221240474U (en) | Shutdown mute circuit of power amplifier integrated circuit | |
| CN215734805U (en) | Intelligent control audio signal amplifier | |
| CN219305014U (en) | Low-power audio amplification chip suppression circuit architecture |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: No. 56 Nanli East Road, Shiqi Town, Panyu District, Guangzhou City, Guangdong Province, 510000 Patentee after: Guangdong Baolun Electronics Co.,Ltd. Address before: No.19 Chuangyuan Road, Zhongcun street, Panyu District, Guangzhou, Guangdong 510000 Patentee before: GUANGZHOU ITC ELECTRONIC TECHNOLOGY Co.,Ltd. |
|
| CP03 | Change of name, title or address |