Audio power amplifier circuit (used voice scheme circuit record)

 Circuit class , Record the circuits of several voice solutions you have used 

Preface

Circuit small class time , The basic 、 Some common circuit designs are summarized , I have thought about whether to summarize the commonly used Boost circuit , Although I have used , But bloggers are now actually using , Basically, there is no booster circuit , So I still feel that I have no experience to talk about , For the time being, the boost circuit will not be used = =！

Just recently, some products have made voice broadcast function , Then I tested some voice chips , Summarize and record the voice circuit . They are all chips that you can find , It also uses the recommended circuit on the data , Just record some problems in your own use and testing .

One 、 Voice module

First, let's briefly talk about the voice module , In fact, there is no special research on this , At the beginning, I also searched on the Internet Voice module found some , Then I checked some relevant information , I asked the manufacturer and the customer got the basic information , Just take it directly and use it for testing .

I drew it myself PCB The tested voice module is also 2 Kind of , My product does not need a professional voice chip , So I haven't touched any high-end products .

With these voice modules, you can find the manufacturer to recommend the schematic diagram , And then build according to the chip data Control circuit and Power amplifier circuit .
Control circuit ： The common one is MCU Serial port communicates with voice module , Or some simple applications directly use a few IO mouth , Voice modules generally have several control pins provided by themselves .
Power amplifier circuit ： According to their own needs , Connected to operational amplifiers of different powers , To be able to support the impassable horn .

1.1 YX6300-24SS

This is still used in some projects , There is a file system , You can go directly through USB Burning voice files , It's easy to use .

The information about this chip manufacturer can also be searched by ourselves , I feel it is very easy to use now ：

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The circuit diagram used for the test （ The main part of the chip is based on the data , The main reason is that the audio power amplification part needs to be designed according to the actual situation ）：

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1.2 WT588D

This chip is very early , Now there may not be any , Because he doesn't have a file system , Only the voice files can be put in according to the specified format Flash, Personally, it is basically eliminated now .

In the early years of testing , I am also tired of making voice files according to special software every time ：

The circuit diagram used for the test ：

Two 、 headphone jack

The headphone connector is not necessary , Just curious before , Also draw the earphone connector , In fact, I drew the wrong picture the first time , Let's use this position to illustrate ：

The headphone connector is in this position , When I first drew the picture, I didn't think much about it （ Wrong way ）：

Later, I found that this connection was wrong , But the actual test , There are also relatively small sounds , The reason may be that there is only one channel of sound , This part doesn't quite understand , So I can't explain too much .

Later, in the next drawing , Pay a little attention to this problem , Changed a way , Here's the picture （ The right way ）：

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There are many kinds of earphone sockets , Even the earphone socket of this style introduced above , The schematic package library provided by the manufacturer may also be various , My approach is not to entangle the schematic diagram , Look directly at the end PCB Whether the connection of is correct , Make adjustments again .

3、 ... and 、 Audio power amplifier

The product needs a power amplifier , So finally, we have to choose a suitable power amplifier , Although it's above YX6300-24SS The chip has built-in power amplifier , But in fact, the manufacturers suggest that they connect a suitable power amplifier .

There are also recommended chips in the manual , Here I have used 2 Medium power amplifier , One is SC8022, One is TPA3110.

3.1 SC8002

I choose what I can buy at Lichuang mall SC8002B , You can search the information ：

There is also a detailed introduction to this chip in the mall , The recommended circuits are as follows ：

In practical use , The circuits I have used are as follows , In fact, several circuits are similar ：

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There is no problem with the above circuit , The horn can also be driven normally .

But for my own applications , Even if the resistance is finally matched to 1K ：51K The proportion of , I feel the sound is still lower than I want , After all, it is a small power operational amplifier .

3.2 TPA3110

because SC8002 Sound problems , I then looked for other solutions , In fact, I finally consulted the technology of the chip manufacturer , They recommended TPA3110 This audio power amplifier chip .

So I looked for some information , Turned out to be TI Chip .TI Chip , The price is really not cheap , But in terms of performance , It must be guaranteed , In fact, I felt good after checking ：

Then I checked the chip data directly ：

It was quickly tested , I don't say much nonsense , Summarize directly with a picture ：

The final test result , Quite satisfactory , Use SC8002 At most, it can only normally support 3W My horn , This can be supported up to 15W 了 , Of course, actually I don't need to use that big .

Conclusion

The circuit in this paper is only used as its own actual project record , Because the intermediate process was also tangled for some time because of the sound problem , But the final result is good .
The whole project is not difficult , I think it's really convenient to do ordinary voice solutions now , A good voice module can save a lot of development work .

That's all for this record , thank you ！

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