CN218071779U

CN218071779U - Drive circuit device for main board of sound box

Info

Publication number: CN218071779U
Application number: CN202221801317.1U
Authority: CN
Inventors: 陈建生
Original assignee: Shenzhen Mingqian Rv Technology Co ltd
Current assignee: Shenzhen Mingqian Rv Technology Co ltd
Priority date: 2022-07-12
Filing date: 2022-07-12
Publication date: 2022-12-16
Anticipated expiration: 2032-07-12

Abstract

The utility model relates to a drive circuit device for audio amplifier mainboard, include: the DC9-18V power supply circuit is used for power supply access and stabilizing the 9-18Vdc voltage into the voltage required by the operation of the sound box main board; the optical fiber input circuit is used for transmitting digital audio to the sound box main board through an optical fiber line by external equipment; the coaxial input circuit is used for transmitting digital audio to the sound box main board through a coaxial line by external equipment; the USB/TF input circuit is used for reading the audio frequency of the U disk or the TF card and transmitting the audio frequency to the sound box main board; AUX input circuit: the external equipment is used for transmitting the analog audio to the sound box main board through an audio line; the device comprises a key, an indicator light and an infrared remote control input circuit; audio output amplifier circuit: for amplification and output of audio sounds. The utility model has the advantages that: the problems of large volume, space occupation, high manufacturing cost and the like of the traditional sound box are solved; the power supply is changed into DC wide voltage power supply, can support 9-18V DC power supply voltage to work, effectively adapts to power supply environments such as vehicles, yachts, solar systems and the like, and widens the application field.

Description

Drive circuit device for main board of sound box

Technical Field

The utility model relates to a drive circuit device for audio amplifier mainboard belongs to the electron field.

Background

The sound box is the most used and most used music playing output mode at present, and compared with the audio output of equipment such as a television, a mobile phone, a notebook computer and the like, the sound box can output a sound source better, and the expression of the sound quality is better than the audio output effect of the equipment such as the television, the mobile phone, the notebook computer and the like.

In practical applications, it is found that the traditional sound box needs to be arranged at least a certain distance behind the traditional sound box. Some cubicles do not have that much distance. Then the loudspeaker box pendulum is closer to the wall, and interference is easy to occur. The traditional sound box has the advantages of large size, occupation, requirement on placement, simple appearance and high manufacturing cost. The traditional sound box has single power supply, the requirement is necessarily AC power supply, the requirement on voltage limitation is met, and the traditional sound box has certain limitation on use.

SUMMERY OF THE UTILITY MODEL

For overcoming the defects of the prior art, the utility model provides a drive circuit device for loudspeaker box mainboard, the technical scheme of the utility model is that:

a drive circuit device for a main board of a sound box comprises:

the DC9-18V power supply circuit is used for power supply access and stabilizing the 9-18Vdc voltage into the voltage required by the operation of the sound box main board;

the optical fiber input circuit is used for transmitting digital audio to the sound box main board by external equipment through an optical fiber line;

the coaxial input circuit is used for transmitting digital audio to the sound box main board by external equipment through a coaxial line;

the USB/TF input circuit is used for reading the audio frequency of the U disk or the TF card and transmitting the audio frequency to the sound box main board;

AUX input circuit: the external equipment is used for transmitting the analog audio to the sound box main board through an audio line;

the key, the indicator light and the infrared remote control input circuit are used for controlling and operating the sound box main board;

audio output amplifier circuit: the audio amplifier is used for amplifying and outputting audio sound and driving a loudspeaker to work.

The DC9-18V power supply circuit comprises a main control chip U5, a main control chip U6, a diode D1, a polar capacitor C50, a polar capacitor C51, a capacitor C35, a capacitor C52, a capacitor C49, a capacitor C48, a capacitor C47, a resistor R26, a resistor R27, an inductor L4 and an inductor L5, wherein an external DC power supply is accessed through a CN1 socket and is connected with the main control chip U5 and the main control chip U6 through a connecting wire for power supply voltage reduction, the anode of the diode D1 is grounded, the cathode of the diode D1 is accessed between the anode and the cathode of the external power supply DC, a polar capacitor C51, a capacitor C52, a capacitor R26 are arranged on a circuit between the external power supply DC and a fifth pin of the main control chip U5, the polar capacitor C51, the capacitor C52 and the capacitor C48 are arranged in parallel, the anode of the polar capacitor C51 and one end of the capacitor C52 and one end of the capacitor C48 are accessed to a circuit between the external power supply DC and the main control chip U5, and the cathode of the polar capacitor C52 and the other end of the capacitor C52 and the capacitor C48 are grounded; the resistor R26 is connected in series between the fourth pin and the fifth pin of the main control chip U5, one end of the resistor R1 is connected with the fourth pin of the main control chip U5, and the other end of the resistor R1 is connected with the VCC _ EN pin of the main control chip U1; one end of the capacitor C35 is connected to the first pin of the main control chip U5, the other end of the capacitor C is connected between the sixth pin of the main control chip U5 and one end of the inductor L4, the other end of the inductor L4 is connected to one end of the inductor L5, and the other end of the inductor L5 forms a 5v voltage output end; a resistor R27, a capacitor C47, a capacitor C49 and a polar capacitor C50 are arranged in parallel on a line between the inductor L4 and the inductor L5, the other end of the resistor R27 is connected with a third pin of the main control chip U5, one end of the resistor R32 and the other end of the capacitor C47, and the negative electrode of the polar capacitor C50 is connected with the other end of the capacitor C49 and then grounded; one end of the resistor R32 is connected to a third pin of the main control chip U5, and the other end of the resistor R is grounded; the positive pole of polar capacitor C51 form 12V voltage output terminal, the positive pole of polar capacitor C50 form VCC5V voltage output terminal.

A polar capacitor C69, a capacitor C70, a capacitor C71 and a resistor R33 are arranged on a line between the external power supply DC and the fifth pin of the main control chip U6, the polar capacitor C69, the capacitor C70 and the capacitor C71 are arranged in parallel, the anode of the polar capacitor C69 and one end of the capacitor C70 and one end of the capacitor C71 are connected to the line between the external power supply DC and the main control chip U6, and the cathode of the polar capacitor C69, the other end of the capacitor C70 and the other end of the capacitor C71 are connected and then grounded; one end of the resistor R33 is connected to the fifth pin of the main control chip U6, the other end of the resistor R is connected to the fourth pin of the main control chip U6, one end of the inductor L9 is connected to the sixth pin of the main control chip U6 and one end of the inductor L9, and the other end of the inductor L9 is connected to the first pin of the main control chip U6; the other end of the inductor L9 is connected to one end of the resistor R34, one end of the capacitor C72, one end of the capacitor C73, the positive electrode of the polarity capacitor C74, and one end of the inductor L10, the other end of the resistor R34 is connected to the third pin of the main control chip U6 and one end of the resistor R35, and the other end of the resistor R35 is grounded; the other end of the capacitor C72 is connected to a third pin of the main control chip U6; the other end of the capacitor C73 and the negative electrode of the polar capacitor C74 are connected and then grounded; the other end of the inductor L10 is connected with one end of a capacitor C75, one end of a capacitor C76, a first pin and a third pin of a main control chip U7, one end of an inductor L11 is connected to a fifth pin of the main control chip U7, one end of a capacitor C77 and one end of a capacitor C78, the other ends of the capacitor C77 and the capacitor C78 are connected with one end of a capacitor C79 and then grounded, and the other end of the capacitor C79 is connected to a fourth pin of the main control chip U7; the other end of the inductor L11 forms a 3.3V voltage output terminal, the anode of the polar capacitor C74 forms a 5V voltage output terminal, and the anode of the polar capacitor C69 forms a 12V voltage output terminal.

The optical fiber input circuit comprises an optical fiber input socket CON2, a capacitor C20, a capacitor C21, a capacitor C23, a capacitor C24 and a main control chip U3, wherein a third pin of the optical fiber input socket CON2 is connected to a first pin of the main control chip U3, a resistor R18 is connected between a fourth pin of the main control chip U3 and a twenty-fifth pin of the main control chip U1, and digital audio optical signals are converted into electric signals to be transmitted to the main control chip U1; a resistor R13, a capacitor C24, a capacitor C23 and a capacitor C25 are sequentially connected in series on a circuit between the third pin of the optical fiber input socket CON2 and the first pin of the main control chip U3, one end of the resistor R15 is grounded, and the other end of the resistor R15 is connected into the third pin of the optical fiber input socket CON2 and one end of the resistor R13; the capacitor C20 and the capacitor C21 are arranged in parallel, one end of the capacitor C20 and one end of the capacitor C21 are connected to the second pin of the optical fiber input socket CON2 and then grounded, and the other end of the capacitor C20 and the other end of the capacitor C21 are connected to the first pin of the optical fiber input socket CON2 and form a 3.3V voltage output end; one end of the capacitor C22 is connected to a fifth pin of the main control chip U3 to form a 3.3V voltage output end, one end of the resistor R16 is connected between the capacitor C23 and the capacitor C25, and the other end of the resistor R20 is connected to one end of the resistor R and then grounded; one end of the resistor R20 is connected with one end of the capacitor C27, one end of the resistor R17 and a third pin of the main control chip U3, and the other end of the capacitor C27 and the other end of the resistor R17 are connected between the capacitor C25 and the first pin of the main control chip U3; the capacitor C29 is connected between the twenty-fifth pin of the main control chip U1 and the resistor R18.

The coaxial input circuit comprises a coaxial input socket CON1 and a main control chip U2, a first pin of the coaxial input socket CON1 and a first pin of the main control chip U2, and a fourth pin of the main control chip U2 is connected to a twenty-sixth pin of the main control chip U1 to transmit a digital audio electric signal to the main control chip U1; a resistor R7, a capacitor C16, a capacitor C14 and a capacitor C15 are sequentially connected in series on a circuit between a first pin of the coaxial input socket CON1 and a first pin of the main control chip U2, one end of the resistor R8 is connected between the coaxial input socket CON1 and the resistor R7, and the other end is grounded; one end of a resistor R9 is connected between a capacitor C14 and a capacitor C15, the other end of the resistor R9 is connected with one end of a resistor R12 and then grounded, the other end of the resistor R12 is connected with one end of a capacitor C18, one end of a resistor R10 and a third pin of a main control chip U2, the other end of the capacitor C18 and the other end of the resistor R10 are connected between the capacitor C15 and a first pin of the main control chip U2, one end of a capacitor C13 is connected with a fifth pin of the main control chip U2 to form a 3.3V voltage output end, and the other end of the capacitor C13 is grounded; a resistor R11 is connected between the main control chip U2 and the main control chip U1, one end of a capacitor C19 is connected between the resistor R11 and the main control chip U1, and the other end is grounded.

The USB/TF input circuit is characterized in that a first pin of a USB socket of the USB/TF input circuit is a 5V voltage output end, a second pin of the USB is connected with a twenty-third pin of the main control chip U1, and a third pin of the USB is connected with a twenty-fourth pin of the main control chip U1 and used for reading audio files of the USB flash disk.

The USB/TF input circuit is provided with a TF card socket, a fourth pin of the TF card socket is a 3.3V voltage output end, a third pin of the TF card socket is connected with a forty-eighth pin of the main control chip U1, a fifth pin of the TF card socket is connected with a forty-seventh pin of the main control chip U1, and a seventh pin of the TF card socket is connected with a first pin of the main control chip U1.

The AUX input circuit is provided with an input socket, a third pin of the input socket is connected with a forty-fourth pin of the main control chip U1, and a fourth pin of the input socket is connected with a forty-third pin of the main control chip U1 and used for simulating left and right sound channels of audio and transmitting the audio to the main control chip U1.

The power button, the P/P button, the NEXT button and the PREV button are arranged in the button, the indicator light and the infrared remote control input circuit, the power button is connected with a nineteenth pin of the main control chip U1, the P/P button is connected with a twentieth pin of the main control chip U1, the NEXT button is connected with a twenty-first pin of the main control chip U21, and the PREV button is connected with a twenty-second pin of the main control chip U1 and used for controlling the on-off, mode switching, volume adding and reducing and up-down curve adjustment of the main control chip U1 through the buttons; the infrared receiving head is arranged in the key, the indicator light and the infrared remote control input circuit, a third pin of the infrared receiving head is a 3.3V voltage output end, and a first pin is connected with an eighteenth pin of the main control chip U1 and used for receiving an infrared signal of the infrared remote controller, converting the infrared signal into an electric signal and transmitting the electric signal to the main control chip U1 so as to realize the work of controlling a product by the remote controller; the key, the indicator lamp and the indicator lamp of the infrared remote control input circuit are of a common-anode LED, a first pin of the common-anode LED is a 3.3V voltage output end, a second pin of the common-anode LED is connected with a twenty-ninth pin of the main control chip U1, and a third pin of the common-anode LED is connected with a thirtieth pin of the main control chip U1, so that color display of different states is achieved.

The audio output amplifying circuit comprises an audio amplifying driver U4, wherein a sixteenth pin and a ninth pin of the audio amplifying driver U4 are connected with CN1 to supply DC power for input, a fifteenth pin of the audio amplifying driver U4 is connected with a fortieth pin of a main control chip U1, an eleventh pin is connected with a thirty ninth pin of the main control chip U1, audio processed by the main control chip U1 is transmitted to the audio amplifying driver U4 through left and right channels, a CON3 socket is connected with a first pin, a second pin, a third pin and a fourth pin of the audio amplifying driver U4 for inserting a right channel loudspeaker, a fifth pin, a sixth pin, a seventh pin and an eighth pin of the main control chip U4 are used for connecting the CON4 socket for inserting a left channel loudspeaker, and a tenth pin of the audio amplifying driver U4 is connected with a fifteenth pin and a forty sixth pin of the main control chip U1 for controlling the mute and mode of the audio amplifying driver U4; the audio amplification driver U4 is used for amplifying the audio signal transmitted by the main control chip U1 and driving the speaker to make a sound.

The utility model has the advantages that: the problems of large volume, space occupation, high manufacturing cost and the like of the traditional sound box are solved; the bar-shaped sound box has novel appearance, cool appearance, small volume and small occupied space, is easy to match with equipment such as a television, a mobile phone, a notebook computer and the like, and is harmonious and attractive; easy to connect and has a plurality of connection modes. In addition, the invention optimizes the requirement of a working power supply, changes the requirement into DC wide voltage power supply, can support the DC power supply voltage of 9-18V to work, effectively adapts to the power supply environments of vehicles, yachts, solar energy systems and the like, widens the application field and breaks the household limitation.

Drawings

Fig. 1 is a schematic view of the main structure of the present invention.

Fig. 2 is a schematic diagram of the DC9-18V power supply circuit in fig. 1.

Fig. 3 is a schematic diagram of the structure of the optical fiber input circuit in fig. 1.

Fig. 4 is a schematic diagram of the coaxial input circuit in fig. 1.

FIG. 5 is a schematic diagram of a USB input circuit of the USB/TF input circuit of FIG. 1.

FIG. 6 is a schematic diagram of a TF input circuit of the USB/TF input circuit of FIG. 1.

Fig. 7 is a schematic diagram of the AUX input circuit of fig. 1.

Fig. 8 is a schematic structural diagram of the key, the indicator light and the infrared remote control input circuit in fig. 1.

Fig. 9 is a schematic diagram of the audio output amplifying circuit of fig. 1.

Detailed Description

The invention will be further described with reference to specific embodiments, the advantages and features of the invention will become more apparent as the description proceeds. These examples are merely illustrative and do not limit the scope of the invention in any way. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention, and that such changes and modifications are intended to be included within the scope of the invention.

Referring to fig. 1 to 9, the utility model relates to a drive circuit device for loudspeaker box mainboard, include: the DC9-18V power supply circuit is used for power access and stabilizing the 9-18Vdc voltage into the voltage required by the operation of the sound box main board; the optical fiber input circuit is used for transmitting digital audio to the sound box main board by external equipment through an optical fiber line; the coaxial input circuit is used for transmitting digital audio to the sound box main board through a coaxial line by external equipment; the USB/TF input circuit is used for reading the audio frequency of the U disk or the TF card and transmitting the audio frequency to the sound box main board; AUX input circuit: the external equipment is used for transmitting the analog audio to the sound box main board through an audio line; the key, the indicator light and the infrared remote control input circuit are used for controlling and operating the sound box main board; audio output amplifier circuit: the audio amplifier is used for amplifying and outputting audio sound and driving a loudspeaker to work.

A polar capacitor C69, a capacitor C70, a capacitor C71 and a resistor R33 are arranged on a line between the external power supply DC and the fifth pin of the main control chip U6, the polar capacitor C69, the capacitor C70 and the capacitor C71 are arranged in parallel, the anode of the polar capacitor C69 and one end of the capacitor C70 and one end of the capacitor C71 are connected to the line between the external power supply DC and the main control chip U6, and the cathode of the polar capacitor C69, the other end of the capacitor C70 and the other end of the capacitor C71 are connected and then grounded; one end of the resistor R33 is connected to the fifth pin of the main control chip U6, the other end of the resistor R is connected to the fourth pin of the main control chip U6, one end of the inductor L9 is connected to the sixth pin of the main control chip U6 and one end of the inductor L9, and the other end of the inductor L9 is connected to the first pin of the main control chip U6; the other end of the inductor L9 is connected to one end of a resistor R34, one end of a capacitor C72, one end of a capacitor C73, the positive electrode of a polarity capacitor C74 and one end of an inductor L10, the other end of the resistor R34 is connected to a third pin of the main control chip U6 and one end of a resistor R35, and the other end of the resistor R35 is grounded; the other end of the capacitor C72 is connected to a third pin of the main control chip U6; the other end of the capacitor C73 and the negative electrode of the polarity capacitor C74 are connected and then grounded; the other end of the inductor L10 is connected with one end of a capacitor C75, one end of a capacitor C76, a first pin and a third pin of a main control chip U7, one end of an inductor L11 is connected to a fifth pin of the main control chip U7, one end of a capacitor C77 and one end of a capacitor C78, the other ends of the capacitor C77 and the capacitor C78 are connected with one end of a capacitor C79 and then grounded, and the other end of the capacitor C79 is connected to a fourth pin of the main control chip U7; the other end of the inductor L11 forms a 3.3V voltage output terminal, the anode of the polar capacitor C74 forms a 5V voltage output terminal, and the anode of the polar capacitor C69 forms a 12V voltage output terminal.

The coaxial input circuit comprises a coaxial input socket CON1 and a main control chip U2, a first pin of the coaxial input socket CON1 and a first pin of the main control chip U2, and a fourth pin of the main control chip U2 is connected to a twenty-sixth pin of the main control chip U1 to transmit a digital audio electric signal to the main control chip U1; a resistor R7, a capacitor C16, a capacitor C14 and a capacitor C15 are sequentially connected in series on a line between a first pin of the coaxial input socket CON1 and a first pin of the main control chip U2, one end of the resistor R8 is connected between the coaxial input socket CON1 and the resistor R7, and the other end of the resistor R8 is grounded; one end of a resistor R9 is connected between a capacitor C14 and a capacitor C15, the other end of the resistor R9 is connected with one end of a resistor R12 and then grounded, the other end of the resistor R12 is connected with one end of a capacitor C18, one end of a resistor R10 and a third pin of a main control chip U2, the other end of the capacitor C18 and the other end of the resistor R10 are connected between the capacitor C15 and a first pin of the main control chip U2, one end of a capacitor C13 is connected with a fifth pin of the main control chip U2 to form a 3.3V voltage output end, and the other end of the capacitor C13 is grounded; a resistor R11 is connected between the main control chip U2 and the main control chip U1, one end of a capacitor C19 is connected between the resistor R11 and the main control chip U1, and the other end is grounded.

The first pin of the USB socket of the USB/TF input circuit is a 5V voltage output end, the second pin of the USB is connected with the twenty-third pin of the main control chip U1, and the third pin of the USB is connected with the twenty-fourth pin of the main control chip U1 and used for reading the audio file of the USB flash disk.

A TF card socket is arranged in a TF input circuit of the USB/TF input circuit, a fourth pin of the TF card socket is a 3.3V voltage output end, a third pin of the TF card socket is connected with a forty-eighth pin of the main control chip U1, a fifth pin of the TF card socket is connected with a forty-seventh pin of the main control chip U1, and a seventh pin of the TF card socket is connected with a first pin of the main control chip U1.

The power key, the P/P key, the NEXT key and the PREV key are arranged in the key, the indicator light and the infrared remote control input circuit, the power key is connected with a nineteenth pin of the main control chip U1, the P/P key is connected with a twentieth pin of the main control chip U1, the NEXT key is connected with a twenty-first pin of the main control chip U21, and the PREV key is connected with a twenty-second pin of the main control chip U1 and is used for controlling the on-off, mode switching, volume up-down and up-down curve adjustment of the main control chip U1 through the keys; the infrared receiving head I R is arranged in the key, the indicator light and the infrared remote control input circuit, a third pin of the infrared receiving head is a 3.3V voltage output end, and a first pin is connected with an eighteenth pin of the main control chip U1 and used for receiving an infrared signal of the infrared remote controller, converting the infrared signal into an electric signal and transmitting the electric signal to the main control chip U1 so as to realize the work of controlling a product by the remote controller; the key, the indicator lamp and the indicator lamp of the infrared remote control input circuit are all-positive LED light-emitting diodes, the first pin of each all-positive LED light-emitting diode is a 3.3V voltage output end, the second pin of each all-positive LED light-emitting diode is connected with the twenty-ninth pin of the main control chip U1, and the third pin of each all-positive LED light-emitting diode is connected with the thirty-ninth pin of the main control chip U1, so that color display in different states is realized.

The audio output amplifying circuit comprises an audio amplifying driver U4, wherein a sixteenth pin and a ninth pin of the audio amplifying driver U4 are connected with CN1 to supply DC power for input, a fifteenth pin of the audio amplifying driver U4 is connected with a fortieth pin of a main control chip U1, an eleventh pin is connected with a thirty ninth pin of the main control chip U1, audio processed by the main control chip U1 is transmitted to the audio amplifying driver U4 through left and right channels, a CON3 socket is connected with a first pin, a second pin, a third pin and a fourth pin of the audio amplifying driver U4 for inserting a right channel loudspeaker, a fifth pin, a sixth pin, a seventh pin and an eighth pin of the main control chip U4 are used for connecting the CON4 socket for inserting a left channel loudspeaker, and a tenth pin of the audio amplifying driver U4 is connected with a fifteenth pin and a forty sixth pin of the main control chip U1 for controlling the mute and mode of the audio amplifying driver U4; the audio amplification driver U4 is used for amplifying the audio signal transmitted by the main control chip U1 and driving the loudspeaker to make a sound.

The D1 diode of the DC9-18V power supply circuit is connected between the DC positive electrode and the DC negative electrode, the positive electrode and the negative electrode are connected with abnormal protection when the DC power supply is input, an external DC power supply is connected through a CN1 socket, the main control chip U5 and the main control chip U6 are connected through a connecting wire for voltage reduction of the power supply, the stable voltage is 5V to provide a stable 5V working power supply for the main control chip U1 and the USB, the stable voltage is 3.3V to provide a working voltage required by 3.3V for the U1, the SD1 and the LED, I R, U2 and U3, and the product can normally work at any input voltage of 9-18V without damage.

The optical fiber input circuit converts digital audio optical signals into electric signals and transmits the electric signals to the main control chip U1; the coaxial input circuit transmits the digital audio electric signal to the main control chip U1;

the USB input circuit of the USB/TF input circuit is used for reading the audio file of the U disk; the TF input circuit of the USB/TF input circuit is used for reading an audio file of the TF card; the AUX input circuit is used for simulating left and right sound channels of audio and transmitting the audio to the U1; the key, the indicator light and the infrared remote control input circuit are used for controlling the on-off, mode switching, volume increasing and decreasing and up-down curve adjustment of the main control chip U1 through the key; the infrared remote control input circuit is used for receiving an infrared signal of the infrared remote controller, converting the infrared signal into an electric signal and transmitting the electric signal to the U1 so as to realize the work of a product controlled by the remote controller; the indicator light LED1 is a common-anode LED to realize color display of different states; the audio output amplifying circuit is used for being inserted into a left channel loudspeaker to drive the loudspeaker to emit sound.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims

1. The utility model provides a drive circuit device for audio amplifier mainboard which characterized in that includes:

the optical fiber input circuit is used for transmitting digital audio to the sound box main board through an optical fiber line by external equipment;

the coaxial input circuit is used for transmitting digital audio to the sound box main board through a coaxial line by external equipment;

the AUX input circuit is used for transmitting analog audio to the sound box main board through an audio line by external equipment;

and the audio output amplifying circuit is used for amplifying and outputting audio sound and driving the loudspeaker to work.

2. The driving circuit device for the main board of the sound box according to claim 1, wherein the DC9-18V power supply circuit comprises a main control chip U5, a main control chip U6, a diode D1, a polarity capacitor C50, a polarity capacitor C51, a capacitor C35, a capacitor C52, a capacitor C49, a capacitor C48, a capacitor C47, a resistor R26, a resistor R27, an inductor L4 and an inductor L5, an external DC power supply is connected through a CN1 socket, the main control chip U5 and the main control chip U6 are connected through a wire for power voltage reduction, an anode of the diode D1 is grounded, a cathode of the diode D1 is connected between an anode and a cathode of the external power supply DC, a circuit between the external power supply DC and a fifth pin of the main control chip U5 is provided with a polarity capacitor C51, a capacitor C52, a capacitor C48 and a resistor R26, the polarity capacitor C51, a capacitor C52 and a capacitor C48 are connected in parallel, an anode of the polarity capacitor C51, one end of the capacitor C52 and one end of the capacitor C48 are connected to a circuit between the external power supply and the main control chip U5, and the other end of the capacitor C51 and the capacitor C52 are both grounded; the resistor R26 is connected in series between the fourth pin and the fifth pin of the main control chip U5, one end of the resistor R1 is connected with the fourth pin of the main control chip U5, and the other end of the resistor R1 is connected to the VCC _ EN pin of the main control chip U1; one end of the capacitor C35 is connected to the first pin of the main control chip U5, the other end of the capacitor C is connected between the sixth pin of the main control chip U5 and one end of the inductor L4, the other end of the inductor L4 is connected to one end of the inductor L5, and the other end of the inductor L5 forms a 5v voltage output end; a resistor R27, a capacitor C47, a capacitor C49 and a polar capacitor C50 are arranged in parallel on a line between the inductor L4 and the inductor L5, the other end of the resistor R27 is connected with a third pin of the main control chip U5, one end of the resistor R32 and the other end of the capacitor C47, and the negative electrode of the polar capacitor C50 is connected with the other end of the capacitor C49 and then grounded; one end of the resistor R32 is connected to a third pin of the main control chip U5, and the other end of the resistor R is grounded; the positive pole of polar capacitor C51 form 12V voltage output terminal, the positive pole of polar capacitor C50 form VCC5V voltage output terminal.

3. The driving circuit device for the main board of the sound box according to claim 2, wherein a polar capacitor C69, a capacitor C70, a capacitor C71 and a resistor R33 are arranged on a line between the external power supply DC and the fifth pin of the main control chip U6, the polar capacitor C69, the capacitor C70 and the capacitor C71 are arranged in parallel, the positive electrode of the polar capacitor C69 and one end of the capacitor C70 and one end of the capacitor C71 are connected to the line between the external power supply DC and the main control chip U6, and the negative electrode of the polar capacitor C69, the other end of the capacitor C70 and the other end of the capacitor C71 are connected and then grounded; one end of the resistor R33 is connected to the fifth pin of the main control chip U6, the other end of the resistor R is connected to the fourth pin of the main control chip U6, one end of the inductor L9 is connected to the sixth pin of the main control chip U6 and one end of the inductor L9, and the other end of the inductor L9 is connected to the first pin of the main control chip U6; the other end of the inductor L9 is connected to one end of a resistor R34, one end of a capacitor C72, one end of a capacitor C73, the positive electrode of a polarity capacitor C74 and one end of an inductor L10, the other end of the resistor R34 is connected to a third pin of the main control chip U6 and one end of a resistor R35, and the other end of the resistor R35 is grounded; the other end of the capacitor C72 is connected to a third pin of the main control chip U6; the other end of the capacitor C73 and the negative electrode of the polar capacitor C74 are connected and then grounded; the other end of the inductor L10 is connected with one end of a capacitor C75, one end of a capacitor C76, a first pin and a third pin of a main control chip U7, one end of an inductor L11 is connected to a fifth pin of the main control chip U7, one end of a capacitor C77 and one end of a capacitor C78, the other ends of the capacitor C77 and the capacitor C78 are connected with one end of a capacitor C79 and then grounded, and the other end of the capacitor C79 is connected to a fourth pin of the main control chip U7; the other end of the inductor L11 forms a 3.3V voltage output terminal, the anode of the polar capacitor C74 forms a 5V voltage output terminal, and the anode of the polar capacitor C69 forms a 12V voltage output terminal.

4. The driving circuit device according to claim 2 or 3, wherein the optical fiber input circuit comprises an optical fiber input socket CON2, a capacitor C20, a capacitor C21, a capacitor C23, a capacitor C24 and a main control chip U3, a third pin of the optical fiber input socket CON2 is connected to the first pin of the main control chip U3, a resistor R18 is connected between the fourth pin of the main control chip U3 and the twenty-fifth pin of the main control chip U1, and the digital audio/video optical signal is converted into an electrical signal and transmitted to the main control chip U1; a resistor R13, a capacitor C24, a capacitor C23 and a capacitor C25 are sequentially connected in series on a circuit between the third pin of the optical fiber input socket CON2 and the first pin of the main control chip U3, one end of the resistor R15 is grounded, and the other end of the resistor R15 is connected into the third pin of the optical fiber input socket CON2 and one end of the resistor R13; the capacitor C20 and the capacitor C21 are arranged in parallel, one end of the capacitor C20 and one end of the capacitor C21 are connected to the second pin of the optical fiber input socket CON2 and then grounded, and the other end of the capacitor C20 and the other end of the capacitor C21 are connected to the first pin of the optical fiber input socket CON2 and form a 3.3V voltage output end; one end of the capacitor C22 is connected to a fifth pin of the main control chip U3 to form a 3.3V voltage output end, one end of the resistor R16 is connected between the capacitor C23 and the capacitor C25, and the other end of the resistor R20 is connected to one end of the resistor R and then grounded; one end of the resistor R20 is connected with one end of the capacitor C27, one end of the resistor R17 and a third pin of the main control chip U3, and the other end of the capacitor C27 and the other end of the resistor R17 are connected between the capacitor C25 and the first pin of the main control chip U3; the capacitor C29 is connected between the twenty-fifth pin of the main control chip U1 and the resistor R18.

5. The driving circuit device for the main board of the sound box according to claim 2 or 3, wherein the coaxial input circuit comprises a coaxial input socket CON1 and a main control chip U2, a first pin of the coaxial input socket CON1 and a first pin of the main control chip U2, a fourth pin of the main control chip U2 is connected to a twenty-sixth pin of the main control chip U1, and the digital audio signal is transmitted to the main control chip U1; a resistor R7, a capacitor C16, a capacitor C14 and a capacitor C15 are sequentially connected in series on a circuit between a first pin of the coaxial input socket CON1 and a first pin of the main control chip U2, one end of the resistor R8 is connected between the coaxial input socket CON1 and the resistor R7, and the other end is grounded; one end of a resistor R9 is connected between a capacitor C14 and a capacitor C15, the other end of the resistor R9 is connected with one end of a resistor R12 and then grounded, the other end of the resistor R12 is connected with one end of a capacitor C18, one end of a resistor R10 and a third pin of a main control chip U2, the other end of the capacitor C18 and the other end of the resistor R10 are connected between the capacitor C15 and a first pin of the main control chip U2, one end of a capacitor C13 is connected with a fifth pin of the main control chip U2 to form a 3.3V voltage output end, and the other end of the capacitor C13 is grounded; a resistor R11 is connected between the main control chip U2 and the main control chip U1, one end of a capacitor C19 is connected between the resistor R11 and the main control chip U1, and the other end is grounded.

6. The driving circuit device for the main board of a sound box according to claim 1, wherein a first pin of the USB socket of the USB/TF input circuit is a 5V voltage output terminal, a second pin of the USB is connected to a twenty-third pin of the main control chip U1, and a third pin of the USB is connected to a twenty-fourth pin of the main control chip U1 for reading the audio file of the USB disk.

7. The driving circuit device for the main board of the speaker as claimed in claim 1, wherein the USB/TF input circuit is provided with a TF card socket, a fourth pin of the TF card socket is a 3.3V voltage output terminal, a third pin of the TF card socket is connected to a forty-eight pin of the main control chip U1, a fifth pin of the TF card socket is connected to a forty-seventh pin of the main control chip U1, and a seventh pin of the TF card socket is connected to the first pin of the main control chip U1.

8. The driving circuit device of claim 1, wherein the AUX input circuit is provided with an input socket, a third pin of the input socket is connected to a fourteenth pin of the main control chip U1, and a fourth pin of the input socket is connected to a forty-third pin of the main control chip U1, so that left and right channels for analog audio are transmitted to the main control chip U1.

9. The driving circuit device for the main board of the speaker as claimed in claim 1, wherein the button, the indicator light and the infrared remote control input circuit are provided with a power button, a P/P button, a NEXT button and a PREV button, the power button is connected to a nineteenth pin of the main control chip U1, the P/P button is connected to a twentieth pin of the main control chip U1, the NEXT button is connected to a twenty-first pin of the main control chip U21, the PREV button is connected to a twenty-second pin of the main control chip U1, and the power button, the P/P button, the NEXT button and the PREV button are used for controlling the on/off, the mode switching, the volume up/down, and the up/down bend adjustment of the main control chip U1; the infrared receiving head is arranged in the key, the indicator light and the infrared remote control input circuit, the third pin of the infrared receiving head is a 3.3V voltage output end, and the first pin is connected with the eighteenth pin of the main control chip U1 and is used for receiving an infrared signal of the infrared remote controller, converting the infrared signal into an electric signal and transmitting the electric signal to the main control chip U1 so as to realize the work of a product controlled by the remote controller; the key, the indicator lamp and the indicator lamp of the infrared remote control input circuit are of a common-anode LED, a first pin of the common-anode LED is a 3.3V voltage output end, a second pin of the common-anode LED is connected with a twenty-ninth pin of the main control chip U1, and a third pin of the common-anode LED is connected with a thirtieth pin of the main control chip U1, so that color display of different states is achieved.

10. The driving circuit device for the main board of the sound box according to claim 1, wherein the audio output amplifying circuit includes an audio amplifying driver U4, a sixteenth pin and a ninth pin of the audio amplifying driver U4 are connected to CN1 for DC power input, a fifteenth pin of the audio amplifying driver U4 is connected to a forty fourth pin of the main control chip U1, an eleventh pin is connected to a thirty ninth pin of the main control chip U1, for transmitting the audio processed by the main control chip U1 to the audio amplifying driver U4 through the left and right channels, a first, a second, a third and a fourth pin of the audio amplifying driver U4 are connected to a CON3 socket for inserting the right channel speaker, a fifth, a sixth, a seventh and an eighth pin of the main control chip U4 are connected to a CON4 socket for inserting the left channel speaker, and a tenth pin of the audio amplifying driver U4 is connected to a fifteenth and a forty-sixth pin of the main control chip U1 for controlling the mute and mode of the audio amplifying driver U4;

the audio amplification driver U4 is used for amplifying the audio signal transmitted by the main control chip U1 and driving the speaker to make a sound.