1

00:00:00,533 --> 00:00:04,433

Hello everyone, in the last class we got to know the sound card in real objects

2

00:00:04,766 --> 00:00:08,333

In this lesson, let's get to know the sound card in the circuit diagram

3

00:00:08,933 --> 00:00:11,966

First find the architecture diagram in the drawings

4

00:00:13,466 --> 00:00:15,966

Find the sound card in the architecture diagram

5

00:00:16,100 --> 00:00:19,566

You can see that the sound card is controlled by PCH

6

00:00:20,000 --> 00:00:23,466

The model of the sound card is ALC892

7

00:00:23,866 --> 00:00:28,500

We directly search for this model and find the sound card chip

8

00:00:29,100 --> 00:00:31,200

This is the sound card chip

9

00:00:32,533 --> 00:00:38,266

It can be seen that there is a line on the sound card chip that divides the sound card chip into two halves.

10

00:00:38,500 --> 00:00:43,533

This line is used to distinguish the digital part and the analog part of the sound card

11

00:00:43,800 --> 00:00:46,800

The one on the left is the digital part of the sound card,

12

00:00:46,966 --> 00:00:50,266

and the one on the right is the analog part of the sound card

13

00:00:51,100 --> 00:00:53,300

Let's first look at the power supply of the sound card

14

00:00:53,933 --> 00:00:55,966

The power supply of the sound card is more

15

00:00:56,200 --> 00:00:59,500

Generally, the power supply for the digital part is 3V,

16

00:00:59,766 --> 00:01:02,366

and the power supply for the analog part is 5V.

17

00:01:02,733 --> 00:01:09,833

The sound card also has a reference voltage output, usually 2.5V

18

00:01:11,966 --> 00:01:15,866

The next digital part is the data bus of the sound card

19

00:01:16,433 --> 00:01:22,500

There are a total of 5 buses on the sound card, all of which are directly connected to the PCH.

20

00:01:23,000 --> 00:01:29,600

These 5 lines are output, clock, input, sync and reset signals

21

00:01:30,133 --> 00:01:35,566

As long as the power supply of the sound card and the 5 data cables are normal,

22

00:01:35,666 --> 00:01:39,066

the sound card can be recognized in the device manager

23

00:01:40,166 --> 00:01:43,500

The digital part is the power supply and the sound card bus

24

00:01:43,533 --> 00:01:46,600

The digital part is over, let's look at the analog part

25

00:01:46,766 --> 00:01:50,666

The simulation part is relatively simple, let's take a look at it in turn

26

00:01:51,200 --> 00:01:53,133

First pin 13

27

00:01:53,166 --> 00:01:59,700

Pin 13 is the insertion detection pin, which is used to detect whether each interface has a plug-in device

28

00:01:59,900 --> 00:02:08,800

And these pin names with _L and _R all go to the left and right channels of each interface

29

00:02:09,133 --> 00:02:13,366

_L is the left channel, _R is the right channel

30

00:02:14,966 --> 00:02:17,733

There are also the reference voltage output of the sound card,

31

00:02:18,000 --> 00:02:21,400

the power supply of the sound card and the grounding of the sound card

32

00:02:21,966 --> 00:02:28,300

The grounding of the analog part of the sound card is different from that of the digital part.

33

00:02:28,566 --> 00:02:32,100

You can see that the ground icon here is different

34

00:02:32,700 --> 00:02:39,566

Further down, the sound card part still has some bias voltage output,

35

00:02:40,033 --> 00:02:43,800

which generally goes to each interface.

36

00:02:49,166 --> 00:02:52,100

There is also an insertion detect pin

37

00:02:52,400 --> 00:02:56,500

It can be seen that the working conditions of the sound card are relatively simple.

38

00:02:56,866 --> 00:03:00,966

As long as there is power supply and data bus, the sound card can be recognized

39

00:03:01,500 --> 00:03:04,600

As long as the sound card can be recognized in the device manager,

40

00:03:04,700 --> 00:03:08,566

it means that the digital part of the sound card is basically working normally

41

00:03:08,866 --> 00:03:13,133

If the sound card can be recognized, but all interfaces have no sound,

42

00:03:13,300 --> 00:03:17,466

it may be that the working conditions of the analog part are not met.

43

00:03:17,566 --> 00:03:19,866

We need to check the simulation part

44

00:03:20,600 --> 00:03:24,000

And if only a single interface has no sound,

45

00:03:24,300 --> 00:03:30,133

then we need to check the left and right channels of a single interface to see if they are normal

46

00:03:31,000 --> 00:03:35,666

The above is our understanding of the sound card in the circuit diagram