Life does not stop, toss more than: service for 8 years of Maibo M200 speakers burst change APT-X lossless Bluetooth 4.0

The landlord is late in lazy cancer and suffers from years of difficulty in getting up: Basically, if it is okay, I can wake up at 8 am and stay in bed until lunch (and then go straight to bed after lunch)

In order to overcome the gravity of the core, when the landlord wakes up in the morning, if he decides to get up, he will take a few songs on his cell phone and listen to it. Then he wakes up. . .

However, the phone's slag sound effect really can not let the landlord satisfied, has been interested in changing a Bluetooth speaker, but within the budget, are basically portable speakers, bought a long time ago, spent a few days, because too lazy to charge, So eat ash. . . If you want to buy a computer speaker, you can at least replace what you use now. However, what you can see is basically thousands, cheaper, and the basic sound quality will not be much different from the current version 2.1. And, there is an important point: low-cost Bluetooth speakers based on cost considerations, and will not invest too much in the Bluetooth chip above, basically enough is enough (of course, this problem can be solved by spending more money. .)

So, the landlord decided to change!

The landlord now uses the Microlab M200 bought eight years ago. . . I remember buying more than 200 when installed in Computer City. The computer has changed for three generations, and only this speaker has been in service and is really worth the price. . .

Since it is the main song to get up, even if it is set version 2.1 speakers, it can not be dropped on the Bluetooth chip, the speaker again, always better than the broken speaker phone. So, the landlord communicated with Duo Niang and finally decided to use the CSR8465 plan.

Probably introduce:

Cambridge Silicon Radio (CSR) is a Fabless factoryless semiconductor manufacturer based in Cambridge, England. Its main product line is a single chip Bluetooth chip, GPS chip.

CSR is currently the world's largest global supplier of Bluetooth chips, with approximately 50% market share. WiFi and VoIP solutions are also available.

The official data of CSR8465 is as follows:

The main relevant parameters:

Bluetooth 4.1 (sister, not 4.0?), support for APT-X lossless audio, support for USB and analog audio input, support for Bluetooth calls (do not use, do not call I holding the speaker), support for one drag two. Some of the other features are not listed one by one. . .

Because the CSR8645 is just a Bluetooth chip, if you want to use it, there are two options: just buy a chip back and then solder yourself; or buy a semi-finished circuit board. The landlord chose the latter.

Where can I buy the chip? Landlord remotely refers to Ma Yunjia:

Landlord to buy this board, the function is still relatively strong:

Board main parameters:

1, with analog audio input and output;

2, DC 10-30V power supply;

3, comes with the op amp;

4, capacitors and other components with good materials;

5, there are two unused: with wheat and control board;

The forehead thought about it. The general idea was to connect the Bluetooth chip to the top layer. The audio input of the speaker was connected to the Line IN of the Bluetooth chip, and then the Line OUT of the Bluetooth chip was connected to the audio input of the speaker circuit board. , This can achieve normal computer can use the speaker, when there is Bluetooth audio over, cut to Bluetooth audio. (Bluetooth chip audio source is Bluetooth audio priority Line IN)

Well, the following is the formal opening, and turn over the cabinet to find the tools to eat ash in all corners: constant temperature soldering station, suction tin, hot melt gun, a variety of screwdrivers and so on. . .

The first is: split!

Microlab M200 as a 2.1 speaker, two satellites of the left and right channels are connected from the subwoofer, then, the transformation is naturally carried out on the subwoofer.

After turning off the self-tapping screws on the back panel of the subwoofer, you can open it.

This work. . . I'm just sorry for my Bluetooth chip. . . Then remove the circuit board, it is very simple: Remove the screws on the back panel. . .

Here is where the landlord wants to change: 2-hole RCA sockets. First confirm the position of the solder joint between the left and right channels and the ground wire, remove the solder joint of the RCA socket with a solder remover, and then take out the RCA socket.

Consider the circuit board for a moment, because the RCA socket is mainly fixed by 3 places: 1 back panel screw, 2 snaps, 3 solder joints. If you want to keep the RCA jack of the back panel in place, it is better to refit the RCA socket after the modification and use the screws on the back panel to fix it.

However, due to the need to weld LINE IN with LINE OUT, the space is actually very tight. . . So, the landlord decided to try first, first bending the left and right channels of welding feet (Sister's, sounds like a dirty look...)

Then solder the Bluetooth line LINE IN. After soldering, bend the soldering pin of the ground wire. . . Save space. . .

The next step is to wire the LINE OUT of the Bluetooth board to the audio input position of the subwoofer circuit board.

Then RCA socket card to the back of the subwoofer to mark a bit, found that the RCA socket 2 buckle a bit block, so cut out diagonal pliers cut. . .

From the bottom of the bed to find a piece of electrical tape, take a lighter burned, barely a little sticky, affixed to the RCA socket welding feet position, to avoid short circuit. . . (Sister, how could this strange thing happen under my bed?)

Well, the Bluetooth panel's LINE IN and LINE OUT are all done, leaving the power supply. . .

Plug the subwoofer into the power supply, turn on the switch, find the 18V DC on the board with the multimeter, and solder the Bluetooth board's power cord. . . (There are certain risks here. Do not imitate any friends who do not have relevant experience)

OK, directly connect the Bluetooth board, once lit, awesome. . .

Try to connect the phone, CSR8645 in the Bluetooth device is the Bluetooth board in this article. . .

Take Netease cloud music to put a song, OK, there is a voice, it seems to be successful. . .

Finally, to find a location to fix the Bluetooth board, I found a place on the back of the subwoofer power cord that was similar to the size of the Bluetooth board. I removed the extra glue with a utility knife and then fixed the Bluetooth board to the bass with a hot glue gun. On the back panel of the cannon, that's right, because the back panel of the subwoofer is metal, so it's best to do some insulation. I conveniently find a buffer foam film inside the express box. . .

After sticking the Bluetooth board up, he found a band-aid to tidy up the line. . . (Brokener, so I can think of it)

In the end, it was mounted back to the original, connected to the audio cable of the satellite speaker and the computer, and threw it under the table. . .

By the way, ask you to visit the messy bottom of the landlord. . .

All right. After the transformation is complete, the 8-year-old speaker is magnificently graded as APT-X lossless Bluetooth speaker. . . The entire renovation costs less than 100 yuan, but at least save hundreds of dollars to buy Bluetooth speakers. . .

Used for a night, but also about feelings:

1, the sound quality, the quality of the speaker itself, the truth is that there is no difference with the computer audio in the past. Plus I usually listen to the 192k MP3, enough to use.

2, Bluetooth signal strength, due to the position of the bottom of the table (in fact, my subwoofer also piled several layers of debris), while the Bluetooth board is glued to the subwoofer on the metal back panel, and the Bluetooth board is not installed Additional antennas, so the Bluetooth signal is not strong through the wall. The approximate signal strength is: There is definitely no problem in the same room (I'm mainly used to lying in bed anyway). If I go to the next room, we must see the angle of the wall. Obliquely passing the wall signal is definitely not acceptable. The sound will be Intermittent (probably the location of the door), but if it is straight through the wall (such as the outside of the living room), but the signal will be very good. Hey, actually this is the same as the WIFI signal. But why should I wear a wall? . . Obviously out of the room, no sound can be heard outside! ! !

3, Bluetooth audio and computer audio source switching. There is a delay of about 1 second or so, which means that the mobile phone will pause playback or select the output of the mobile phone horn. The Bluetooth board will switch to the computer's audio source to continue playing the sound on the computer. . .

4, when the phone uses Bluetooth output, the phone will recognize the Bluetooth board as a Bluetooth headset, hey, in fact, look at the icon to know. . .

Finally, the use of Bluetooth board space is still quite large. . .

For example, you can make a Bluetooth amp, change the Bluetooth input to your car's CD player, and you can't think of it. You can't do it. (Why, can't I tell you the wrong hand? No, I'm right!)

The most important thing for DIY is the fun in the process, the joy of success, and the joy of sharing (and the joy of keeping your hands!) Thank you for watching ~ Sahua ~~~

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