Television mainboard circuit

Abstract

The utility model discloses a television mainboard circuit which is characterized in that a left channel interface is sequentially connected in series with a first chip resistor and a first chip capacitor to a left channel positive input pin of a mainboard; a left channel negative input pin of the mainboard is connected in series with a second chip resistor; a right sound channel negative input pin of the mainboard is connected in series with a third chip resistor; the right sound channel interface is connected in series with a second chip resistor and a fourth chip capacitor in sequence to a right sound channel positive input pin of the mainboard; an analog power supply pin of the mainboard is connected in series with a fifth chip resistor; an upper tube gate driving voltage of the mainboard is connected in series with a sixth chip resistor pin; the first chip capacitor, the second chip capacitor, the third chip capacitor, the fourth chip capacitor, the fifth chip capacitor and the sixth chip capacitor are all 1 uf in size, and the first chip resistor and the second chip resistor are 0 ohm in size.

Description

Technical Field

[0001] The invention relates to the field of computer voice signal processing, and in particular to a television mainboard circuit. Background Art

[0002] With the development of social economy and the improvement of people's living standards, the functions of TV sets as the standard of family equipment are becoming more and more powerful. However, the development of TV screen quality and size is much faster than the development of TV sound quality. Figure 1 This is a partial schematic diagram of an existing TV mainboard circuit. It has a high audio distortion rate. Therefore, improving the TV audio quality and reducing the distortion rate are also urgent requirements of the market. The most core component that affects the TV audio quality lies in the TV mainboard circuit.

[0003] Therefore, it is necessary to develop a new TV mainboard circuit to improve the TV audio quality. Summary of the invention

[0004] In order to overcome the deficiencies of the prior art, the purpose of the present invention is to provide an improved TV mainboard circuit, which can improve the audio distortion of the TV mainboard by adjusting the size and number of chip capacitors and the number of chip resistors.

[0005] The present invention is implemented through the following technical scheme: a television mainboard circuit, comprising: a left channel interface is connected in series with a first SMD resistor and a first SMD capacitor to the left channel positive input pin of the mainboard in sequence; the left channel negative input pin of the mainboard is connected in series with a second SMD resistor; the right channel negative input pin of the mainboard is connected in series with a third SMD resistor; the right channel interface is connected in series with a second SMD resistor and a fourth SMD capacitor to the right channel positive input pin of the mainboard in sequence; the analog power pin of the mainboard is connected in series with a fifth SMD resistor; the upper tube gate drive voltage of the mainboard is connected in series with a sixth SMD resistor pin; the first SMD capacitor, the second SMD capacitor, the third SMD capacitor, the fourth SMD capacitor, the fifth SMD capacitor, and the sixth SMD capacitor are all 1uf in size, and the first SMD resistor and the second SMD resistor are 0ohm in size.

[0006] Furthermore, the pressure limiting pin of the mainboard is not connected to the chip capacitor.

[0007] Furthermore, the pressure limiting pin of the mainboard is connected in series with the upper tube gate driving voltage pin of the mainboard through a fourth chip resistor, and is grounded through a fifth chip resistor in series.

[0008] Furthermore, the pins on the same side of the mainboard are composed of a standby logic input pin, an open-drain output pin, the left channel positive input pin, the left channel negative input pin, a gain adjustment 0 pin, a gain adjustment 1 pin, the analog power pin, the analog ground pin, the upper tube gate drive voltage pin, the pressure limit pin, the right channel negative input pin, a right channel positive input pin, a floating pin, and a parallel bridge load pin.

[0009] Furthermore, the above-mentioned pins of the mainboard are only connected to six chip capacitors.

[0010] Furthermore, the mainboard adapted to the TV mainboard circuit uses the China Resources 3817 chip.

[0011] Compared with the prior art, the present invention can achieve the following beneficial effects:

[0012] The television mainboard circuit of the present invention changes the chip capacitors CA1, CA2, CA3, CA4, CA5, and CA6 on the original mainboard circuit from 0.22uf to 1uf, changes the chip resistors RA1 and RA2 from 100ohm to 0ohm, and deletes the chip capacitor CA7, so that the negative feedback of the television mainboard circuit is applied appropriately, so that an amplifier device with a high characteristic frequency, a small noise factor and good linearity can be selected to significantly reduce the audio distortion rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The figure shows a schematic diagram of a circuit structure of an existing TV mainboard;

[0014] Figure 2 Shown is a schematic diagram of the circuit structure of the television mainboard of the present invention. DETAILED DESCRIPTION

[0015] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment.

[0016] like Figure 1 As shown, an embodiment of the present invention discloses a television mainboard circuit, wherein the mainboard has fourteen pins, six chip capacitors, and six chip resistors in sequence on the same side.

[0017] like Figure 2As shown, the left channel interface is connected in series with a first SMD resistor and a first SMD capacitor to the left channel positive input pin of the mainboard; the left channel negative input pin of the mainboard is connected in series with a second SMD resistor; the right channel negative input pin of the mainboard is connected in series with a third SMD resistor; the right channel interface is connected in series with a second SMD resistor and a fourth SMD capacitor to the right channel positive input pin of the mainboard; the analog power pin of the mainboard is connected in series with a fifth SMD resistor; the upper tube gate drive voltage of the mainboard is connected in series with a sixth SMD resistor pin; the first SMD capacitor, the second SMD capacitor, the third SMD capacitor, the fourth SMD capacitor, the fifth SMD capacitor, and the sixth SMD capacitor are all 1uf in size, and the first SMD resistor and the second SMD resistor are 0ohm in size. In this way, by replacing the original scheme mainboard circuit (such as Figure 1 ) are changed from 0.22uf to 1uf, the chip resistors RA1 and RA2 are changed from 100ohm to 0ohm, and the chip capacitor CA7 is deleted, so that the negative feedback of the TV mainboard circuit is applied appropriately, so that an amplifier device with high characteristic frequency, small noise coefficient and good linearity can be selected to significantly reduce the audio distortion rate.

[0018] Furthermore, the pressure limiting pin of the mainboard is not connected to a chip capacitor, the pressure limiting pin of the mainboard is connected in series to the upper tube gate drive voltage pin of the mainboard through a fourth chip resistor, and is grounded through a fifth chip resistor in series, and the pins on the same side of the mainboard are composed of a standby logic input pin, an open-drain output pin, the left channel positive input pin, the left channel negative input pin, a gain adjustment 0 pin, a gain adjustment 1 pin, the analog power pin, an analog ground pin, the upper tube gate drive voltage pin, the pressure limiting pin, the right channel negative input pin, a right channel positive input pin, a suspended pin, and a parallel bridge load pin, which are arranged in sequence, and the above-mentioned pins of the mainboard are only connected to six chip capacitors.

[0019] It should be noted that the motherboard adapted to the TV mainboard circuit uses the China Resources 3817 chip.

[0020] In summary, the present invention is an improved television mainboard circuit, in which the chip capacitors CA1, CA2, CA3, CA4, CA5 and CA6 on the original mainboard circuit are changed from 0.22uf to 1uf, the chip resistors RA1 and RA2 are changed from 100ohm to 0ohm, and the chip capacitor CA7 is deleted, so that the negative feedback of the television mainboard circuit is applied appropriately, so that an amplifier device with high characteristic frequency, small noise coefficient and good linearity can be selected to significantly reduce the audio distortion rate.

[0021] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A TV mainboard circuit, comprising: The left channel interface is connected in series with a first chip resistor and a first chip capacitor to the left channel positive input pin of the mainboard; A second chip resistor is connected in series to the left channel negative input pin of the mainboard; A third chip resistor is connected in series to the right channel negative input pin of the mainboard; The right channel interface is connected in series with a second chip resistor and a fourth chip capacitor to the right channel positive input pin of the mainboard; A fifth chip resistor is connected in series to the analog power pin of the mainboard; The upper tube gate drive voltage of the mainboard is connected in series with a sixth chip resistor pin; The sizes of the first SMD capacitor, the second SMD capacitor, the third SMD capacitor, the fourth SMD capacitor, the fifth SMD capacitor, and the sixth SMD capacitor are all 1uf, and the sizes of the first SMD resistor and the second SMD resistor are 0ohm.

2. The TV mainboard circuit as claimed in claim 1, characterized in that: The pressure limit pin of the mainboard is not connected to the chip capacitor.

3. The TV mainboard circuit as claimed in claim 2, characterized in that: The pressure limiting pin of the mainboard is connected in series to the upper tube gate driving voltage pin of the mainboard through a fourth SMD resistor, and is connected in series to ground through a fifth SMD resistor.

4. The TV mainboard circuit as claimed in claim 3, characterized in that: The pins on the same side of the mainboard are composed of a standby logic input pin, an open-drain output pin, the left channel positive input pin, the left channel negative input pin, a gain adjustment 0 pin, a gain adjustment 1 pin, the analog power pin, the analog ground pin, the upper tube gate drive voltage pin, the pressure limit pin, the right channel negative input pin, a right channel positive input pin, a suspended pin, and a parallel bridge load pin.

5. The TV mainboard circuit as claimed in claim 4, characterized in that: The above-mentioned pins of the mainboard are only connected to six chip capacitors.

6. The TV mainboard circuit as claimed in claim 1, characterized in that: Also includes a CR 3817 chip.

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