CN215420723U

CN215420723U - Input and operational amplifier circuit of professional active sound box

Info

Publication number: CN215420723U
Application number: CN202120990924.6U
Authority: CN
Inventors: 祁世龙
Original assignee: Iag Group Co ltd
Current assignee: IAG Group Ltd
Priority date: 2021-05-10
Filing date: 2021-05-10
Publication date: 2022-01-04
Anticipated expiration: 2031-05-10

Abstract

The utility model provides an input and operational amplifier circuit of a professional active sound box, and belongs to the field of sound box circuits. The utility model comprises an input unit, a first-stage amplification unit, a second-stage amplification unit, an adjustment unit and a selection switching unit which are sequentially arranged according to the flow direction of an audio signal, wherein the second-stage amplification unit comprises two paths, the output ends of the second-stage amplification unit are respectively connected with the adjustment unit, and the selection switching unit is respectively connected with the two paths of adjustment units and is used for selecting the audio signal to be input from one of the two paths. The utility model has the beneficial effects that: the requirements of different sound source signal connection modes are met, various use scenes are met, and the use is more convenient.

Description

Input and operational amplifier circuit of professional active sound box

Technical Field

The present invention relates to a speaker circuit, and more particularly, to an input and operational amplifier circuit for a professional active speaker.

Background

A speaker refers to a device that can convert an audio signal into sound. The popular way is that the audio signal processing circuit is arranged in a main box body or a bass box body of the sound box, and the sound is emitted back by the sound box after the audio signal is amplified, so that the sound of the sound box is increased. In the audio signal processing circuit, it is an important loop to amplify the input signal, in the prior art, various interfaces are generally input to the same amplifying circuit, and adjustment is performed at the same time, so that the precision cannot meet the requirement, and the audio signal processing circuit cannot be applied to a professional sound box with high precision requirement.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems in the prior art, the utility model provides an input and operational amplifier circuit of a professional active sound box.

The utility model comprises an input unit, a first-stage amplification unit, a second-stage amplification unit, an adjustment unit and a selection switching unit which are sequentially arranged according to the flow direction of an audio signal, wherein the second-stage amplification unit comprises two paths, the output ends of the second-stage amplification unit are respectively connected with the adjustment unit, and the selection switching unit is respectively connected with the two paths of adjustment units and is used for selecting the audio signal to be input from one of the two paths.

The utility model is further improved, two paths of the second-stage amplification unit are respectively a LINE channel for linear amplification and an MIC channel for microphone amplification, and an audio source output socket is further arranged at the output end of the LINE channel.

The utility model is further improved, the input unit comprises an RTS/XLR socket, the output end of the RTS/XLR socket is connected with the input end of the first-stage amplification unit, and the output end of the first-stage amplification unit is respectively connected with the input ends of the LINE channel and the MIC channel.

The utility model is further improved, the input unit also comprises an RCA input socket, and the audio signal input by the RCA is amplified by the first-stage amplification unit and then input to the LINE channel.

The utility model is further improved, the input unit also comprises a USB interface and a Bluetooth wireless input interface, and sound sources received by the USB interface and the Bluetooth wireless input interface are amplified by the first-stage amplification unit and then input into the LINE channel.

The utility model is further improved, the USB interface and the Bluetooth wireless input interface are integrated into a Bluetooth module, the Bluetooth module comprises a Bluetooth chip U103, a pin 9 and a pin 10 of the Bluetooth chip U103 are respectively connected with a pin 3 and a pin 4 of a USB interface JK102, a signal received by the USB interface JK102 is input to a first-stage amplification unit through the Bluetooth chip, a pin 1 of the Bluetooth chip U103 is connected with a Bluetooth antenna, and

pins

25 and 26 of the Bluetooth antenna U103 are output pins and are respectively connected with the input end of the first-stage amplification unit.

The utility model is further improved, and the first-stage amplifying unit is formed by connecting more than 1 amplifying circuits in series.

In a further improvement of the present invention, the adjusting units are volume potentiometers VR101 and VR102, wherein the volume potentiometer VR101 is connected in series to the output end of the LINE channel, and the volume potentiometer VR102 is connected in series to the output end of the MIC channel.

In a further improvement of the present invention, the selection switch unit is a switch SW1, a LINE switch end of the switch SW1 is connected to the adjustment end of the volume potentiometer VR101 through a resistor, an MIC switch end of the switch SW1 is connected to the adjustment end of the volume potentiometer VR102 through a resistor, and a normal connection end of the switch SW1 is connected to the post-stage circuit.

Compared with the prior art, the utility model has the beneficial effects that: the input signal connected with the input circuit has various interface forms, so that the requirements of different sound source signal connection modes are met; different interface sound sources can separately carry out the second grade and enlarge, and the magnification is different, satisfies the required precision to, different second grade enlargies the branch road and all is equipped with regulating circuit, separately adjusts audio signal, satisfies various use scenes, and it is more convenient to use.

Drawings

FIG. 1 is a block diagram of the present invention;

FIG. 2 is a schematic diagram of an input unit and a first stage amplifying unit according to an embodiment of the present invention;

fig. 3 is a schematic circuit diagram of the second stage amplifying unit, the adjusting unit and the selection switching unit.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

As shown in fig. 1, the present invention includes an input unit, a first-stage amplification unit, a second-stage amplification unit, an adjustment unit, and a selection switching unit, which are sequentially arranged according to the flow direction of an audio signal, wherein the second-stage amplification unit has two paths, the output ends of the second-stage amplification unit are respectively connected to the adjustment unit, and the selection switching unit is respectively connected to the two paths of adjustment units, and is configured to select an audio source signal to be input from one of the two paths.

Two paths of the second-stage amplification unit of the embodiment are respectively a LINE channel for linear amplification and an MIC channel for microphone amplification, and an audio source output socket is further arranged at the output end of the LINE channel. The amplification factor of the operational amplifier in the LINE channel and the MIC channel to the audio frequency is different, wherein the amplification factor in the MIC channel is larger, so that the tone quality of the received microphone sound is more outstanding, the design is more humanized, and the precision requirement of professional sound equipment is met. In addition, different second grade amplification branches all are equipped with regulating circuit, separately adjust respective audio signal, satisfy various use scenes, and it is more convenient to use.

The input signals connected with the input circuit of the embodiment have various interface forms, so that the requirements of different sound source signal connection modes are met, the input signals of all the input interfaces can be respectively connected with one path of first-stage amplification unit, and a plurality of input sound sources can be classified into one path and then are uniformly connected with the first-stage amplification unit. The first-stage amplification unit can amplify one operational amplifier module or amplify a plurality of operational amplifier modules in series.

Specifically, the input unit comprises sockets JK101 and JK201 for TRS/XLR mixed audio input, a socket RCAJK-1 for RCA (lotus socket, called AV terminal, also called AV interface) input, a USB input interface and an upright Bluetooth input module ATS-2815.

The first-stage amplification unit and the second-stage amplification unit comprise an operational amplifier U201A, an operational amplifier U201B, an operational amplifier U101A, an operational amplifier U101B, an operational amplifier U208A, an operational amplifier U208B, an operational amplifier U105A, an operational amplifier U105B, an operational amplifier U202A, an operational amplifier U202B and a peripheral resistance-capacitance device thereof, the adjusting unit comprises volume potentiometers VR101 and VR102 and peripheral devices thereof, and the selection switching unit is a selection switch SW 1.

The working principle of the embodiment is as follows:

TRS/XLR balanced signals input by JK101 and JK201 sockets are subjected to differential amplification by operational amplifiers U101A and U201A, then are combined together to be connected with a pin 6 of an operational amplifier U201B, are subjected to reverse amplification by the operational amplifier U201B, are output to a capacitor C213 through a pin 7 of the U201B, are output in two paths, one path is subjected to amplification by R275 and the operational amplifier U105A, and the operational amplifier U105B is amplified, passes through a volume potentiometer VR101 to a selective switch LINE switching end, is output to a rear amplitude limiting circuit through a LINE channel, and the other path is amplified by an operational amplifier U202A and the operational amplifier U202B amplifying circuit, passes through a volume potentiometer VR102 to an MIC switching end of the selective switch, and is output to the rear amplitude limiting circuit through an MIC channel.

The RCAJK-1 socket is RCA input, is amplified by an operational amplifier U101B, an operational amplifier U105A and an operational amplifier U105 amplifying circuit, passes through a volume potentiometer VR101 to a LINE switching end of a selection switch SW1, and is output to a subsequent amplitude limiting circuit. Signals received by the USB input and the Bluetooth are amplified to appropriate signals through a Bluetooth input module ATS-2815, an operational amplifier U208B, an operational amplifier U208A, an operational amplifier U105A, an operational amplifier U105 and a capacitor resistor capacitor at the periphery of the operational amplifier U105, pass through a volume potentiometer VR101, then reach a LINE switching end of a selection switch SWI, and are output to a subsequent amplitude limiting circuit.

The USB interface of this embodiment may be separately configured for the bluetooth module, or may be configured as another sound source interface, and when the USB interface is used as a microphone sound source, the LINE channel is uniformly routed, and when the USB interface is used as another music or audio input other than the microphone sound source, the USB interface is divided into two paths, which are respectively routed through the LINE channel and the MIC channel, or certainly, the MIC channel may be directly routed.

As another embodiment of the present invention, the signal switching module in this embodiment may also be a key switch capable of connecting two input ends simultaneously, at this time, the sound source of the MIC channel is a main audio, and the audio of the LINE channel may be an auxiliary sound source, for example, as a background sound, and the like, and the two channels may independently adjust the volume, thereby meeting various scene requirements.

The above-described embodiments are intended to be illustrative, and not restrictive, of the utility model, and all changes that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims

1. The utility model provides an input and operational amplifier circuit of active audio amplifier of specialty which characterized in that: the audio amplifier comprises an input unit, a first-stage amplification unit, a second-stage amplification unit, an adjusting unit and a selection switching unit which are sequentially arranged according to the flow direction of an audio signal, wherein the second-stage amplification unit comprises two paths, the output ends of the second-stage amplification unit are respectively connected with the adjusting unit, and the selection switching unit is respectively connected with the two paths of adjusting units and is used for selecting the audio signal to be input from one of the two paths.

2. The input and operational amplifier circuit of a professional active speaker as claimed in claim 1, wherein: two paths of the second-stage amplification unit are respectively a LINE channel for linear amplification and an MIC channel for microphone amplification, and an audio source output socket is further arranged at the output end of the LINE channel.

3. The input and operational amplifier circuit of a professional active speaker as claimed in claim 2, wherein: the input unit comprises an RTS/XLR socket, the output end of the RTS/XLR socket is connected with the input end of the first-stage amplification unit, and the output end of the first-stage amplification unit is connected with the input ends of the LINE channel and the MIC channel respectively.

4. The input and operational amplifier circuit of professional active speaker as claimed in claim 3, wherein: the input unit further comprises an RCA input socket, and the audio signals input by the RCA are amplified by the first-stage amplification unit and then input to the LINE channel.

5. The input and operational amplifier circuit of professional active speaker as claimed in claim 3, wherein: the input unit further comprises a USB interface and a Bluetooth wireless input interface, and sound sources received by the USB interface and the Bluetooth wireless input interface are amplified by the first-stage amplification unit and then input into the LINE channel.

6. The input and operational amplifier circuit of professional active speaker as claimed in claim 5, wherein: the Bluetooth module is characterized in that the USB interface and the Bluetooth wireless input interface are integrally arranged, the Bluetooth module comprises a Bluetooth chip U103, a pin 9 and a pin 10 of the Bluetooth chip U103 are respectively connected with a pin 3 and a pin 4 of a USB interface JK102, a signal received by the USB interface JK102 is input into a first-stage amplification unit through the Bluetooth chip, a pin 1 of the Bluetooth chip U103 is connected with a Bluetooth antenna, and pins 25 and 26 of the Bluetooth antenna U103 are output pins and are respectively connected with the input end of the first-stage amplification unit.

7. The input and operational amplifier circuit of professional active speaker as claimed in claim 6, wherein: the first-stage amplification unit is formed by connecting more than 1 amplification circuits in series.

8. The input and operational amplifier circuit of a professional active speaker as claimed in any one of claims 2-7, wherein: the adjusting units are volume potentiometers VR101 and VR102, wherein the volume potentiometers VR101 are connected in series at the output end of the LINE channel, and the volume potentiometers VR102 are connected in series at the output end of the MIC channel.

9. The input and operational amplifier circuit of a professional active speaker as claimed in claim 8, wherein: the selection switching unit is a switching switch SW1, a LINE switching end of the switching switch SW1 is connected with a regulating end of a volume potentiometer VR101 through a resistor, an MIC switching end of the switching switch SW1 is connected with a regulating end of a volume potentiometer VR102 through a resistor, and a normally-connected end of the switching switch SW1 is connected with a rear-stage circuit.