It’s that simple to turn an ordinary speaker into a Bluetooth speaker in an instant
Many people have ready-made audio equipment at home, but the functions of old-fashioned amplifiers are limited. Lossless music on the Internet is very popular. In this era, I play the songs on the CD disc, but I feel unwilling to do so! What if I want to use an amplifier to play music from my phone? Using a 3.5-inch Lotus to connect the amplifier is inconvenient, and the sound quality after conversion to the phone's headphone jack is really not flattering. For many users, the speakers at home are fine. What if buying a set of Bluetooth speakers feels a bit wasteful?
How to change the existing audio equipment at home to Bluetooth audio?
Method 1: Make enough food and clothing by yourself
A certain treasure bought a Bluetooth audio receiver module and DIYed it himself.
Open the cover of the power amplifier and solder it directly to the board at the output end of the power amplifier. The circuit is for reference only.
Under normal circumstances, the store will give you corresponding DIY tutorials.
This method saves the most money but is not trouble-free at all. If you are not very capable and do not have the corresponding tools, this method is not recommended. Moreover, the module quality varies, and whether it is compatible with the original power amplifier system is another matter. It is also difficult to guarantee the sound quality and other aspects. So, for those who don’t want to bother, we recommend a simpler and trouble-free method with good sound quality.
Method 2: Purchase a Bluetooth receiver
Recommended: Tianyi BTS-1 Bluetooth receiver
Price: 280RMB
Appearance introduction: The BTS-1 Bluetooth receiver has an independent black box structure. The box is made of black high-gloss casting technology, and the details are exquisite and eye-catching.
Function: LINE OUT (analog L/R audio), digital coaxial (COAX), digital optical fiber (OPT)
How to use:
1. Connect with optical fiber: Connect one end of the optical fiber cable (GQ-1) to the BTS-1 digital optical fiber (OPT) output interface, insert the other end into the optical fiber inlet of the power amplifier, and select the BTS-1 switch to toggle Digital.
2. Connect with a digital coaxial (COAX) cable: connect one end of the coaxial cable to the BTS-1 output interface, insert the other end into the coaxial inlet of the power amplifier, and select the BTS-1 switch to toggle Digital .
3. Audio analog lotus terminal cable connection: use a pair of relatively feverish audio signal cables to insert into the L/R output terminals of the BTS-1 output interface, and connect the other ends of the cables to the power amplifier signal L /R input interface, and select the BTS-1 switch to toggle the Analog file.
Next, open the phone system settings - Bluetooth, and pair the phone with BTS-1.
What are the advantages of sound quality:
BTS-1 uses high-tech Bluetooth high-fidelity transmission APTX patented technology, which can compress linear audio samples to 1/4 of the original. There is no obvious degradation in sound quality and low latency (uncompressed audio uses 1.411Mbps bandwidth to achieve CD quality), and it can output SPDIF digital signals and stereo analog audio signals, especially when the output signal is SPDIF digital signal using optical fiber or coaxial digital cable. Excellent effect! Much better than stereo analog audio signals! It is indeed comparable to the sound quality of a CD player playing an original CD! It has better sound quality and timbre effect than ordinary Bluetooth audio transmission. It is an indispensable tool for many high-fidelity speakers to obtain digital audio signal sources and mobile phone song libraries to achieve high-fidelity Bluetooth music playback.
Bluetooth itself is a wireless data transmission protocol. It was originally used to realize short-distance data exchange between devices. Bluetooth uses the 2.4G box frequency band and was proposed by Ericsson in 1994. The largest The advantage is that the Bluetooth protocol supports the connection of multiple devices.
With the development of Bluetooth technology, the Bluetooth Technology Alliance now has more than 20,000 member companies, covering communications, computers, personal digital products, audio and other fields. It first appeared in communication between mobile phones. Later, Both industrial and consumer products use Bluetooth technology.
When it was first used for audio transmission, the Bluetooth protocol version used was low. At that time, it was mainly used for wireless headsets for mobile phones. At that time, it only supported monophonic sound, had poor sound quality (low decoding accuracy) and high power consumption. Therefore, it has been used until now. , some stubborn old audio enthusiasts always think that Bluetooth is not high-fidelity if it is used for audio transmission. In fact, with the current Bluetooth 4.2 version, the sound quality has been greatly improved, the transmission distance has reached more than 10 meters, and the power consumption has been reduced.
Due to the convenience of use, Bluetooth is currently standard on mobile phones because it is easy to connect to various consumer electronic products, such as bracelets, headphones, blood pressure monitors, balance bikes, etc. If you have a Bluetooth speaker at home , it is much more convenient to connect. As the mobile phone is used as a sound source, you can take your favorite songs with you at any time and play them at any time.
It is very simple to turn an ordinary speaker into a Bluetooth speaker. There are two methods:
1. Purchase finished products
There are many such products now. For example, Xiaomi's Bluetooth audio receiver costs tens of yuan and has a built-in battery, so you don't have to worry about introducing AC noise. As long as you connect it to the speaker with a 3.5mm audio cable, the speaker can be upgraded to a Bluetooth speaker, which is very convenient.
2. DIY
Do-it-yourself (DIY) can feel the fun in the process of making and enrich your knowledge and skills. Science and engineering men must try it. Below is a Bluetooth receiver I made and two speakers equipped with Bluetooth modules.
1. Production of Bluetooth audio receiver
We need to prepare the following materials: two RCA sockets, a 1200mAh lithium-ion battery, a stereo transmission module of Bluetooth 4.0 protocol, and a switch Only one MicroUSB interface, and some necessary resistor-capacitor components.
Find a small plastic box and punch holes to install various connectors.
The battery, module and plug are installed and glued firmly, and all the wires are soldered.
The speakers we use are Onkyo amplifiers and bookshelf HIVI speakers
2. The Hussars M7 is equipped with a Bluetooth module
This is the Hussars M7 speaker. Active mode is adopted. The so-called active means that the speaker contains a power amplification unit inside. As long as there is an external signal input, it can produce sound. However, passive speakers need to be equipped with a power amplifier (referred to as power amplifier, commonly known as amplifier) ??to promote the work of the speaker. Active The advantage is high integration, easy installation, and low user investment cost; the disadvantage is that because there are transformers, circuit boards, etc. inside, it takes up a certain amount of space, resulting in a reduction in the effective volume inside the box, and the simple power amplifier circuit causes damage to the sound quality. Therefore, active mode is usually used in the design of small speakers.
In order to upgrade and transform, we have prepared a set of 4.0 Bluetooth stereo modules, including a blue LED status indicator and a power decoupling capacitor.
The internal power amplifier is composed of LM1875, and the circuit is relatively simple. Now we connect the Bluetooth 4.0 stereo module to the circuit: weld the original signal input line from the power amplifier board, weld it to the audio input end of the Bluetooth module, and then weld the Bluetooth audio input end to the input end of the power amplifier. In this way, When there is a Bluetooth link, the Bluetooth output signal is played. When there is no Bluetooth connection, it automatically switches to the original audio input.
Because the working power supply of the Bluetooth module is 3.3-5V, and the working voltage of the speaker is 18V, a DC/DC step-down module must be assembled to reduce the main power supply of 18V to the Bluetooth working voltage.
Then we glued the Bluetooth module to the top of the speaker with 704 glue, and the Bluetooth antenna to the inside front.
After assembly, there is an additional LED on the panel. When it flashes, it means waiting for pairing or linking. When it stays on, it means the Bluetooth link is successful.
3. Installing a Bluetooth module on an ancient radio recorder
This SHARP GF777, known as the "King of Recorders", is huge in size. In terms of frequency parameters, it is not even today. It is lagging behind. Today, when used to listen to FM, the sound quality is still satisfactory. Unfortunately, the popular tapes back then have been eliminated. It would be a pity to only use it to listen to FM.
Through analysis, this circuit board is the PCB of the LINE input circuit, and this single-in-line 9P IC is the PHONO amplifier circuit. We will not touch it. Find these three pads, which are the output points of the LINE or PHONO amplified circuit. We need to connect the Bluetooth decoding module here.
Prepare a Bluetooth decoding module. Prepare another 2.4G antenna.
This is the soldered Bluetooth module. Now we need to find a suitable location to install it in the radio recorder. I plan to stick the antenna to the top of the inner wall of the radio.
This is what it looks like after it is glued. The decoding module is on the left and the Bluetooth antenna is on the right.
Finally, install the power supply, then cover the casing. After turning on the power, search for the Bluetooth module. After pairing, change the name to "SHARP GF777". Thus, a radio recorder with Bluetooth decoding function is transformed. .
Play the tape, put the function switch on TAPE, and put the radio on Radio. If you want to connect a mobile phone, put the function switch on Line in. At this time, if there is a Bluetooth paired mobile phone, it will play For music in the mobile phone, since this Bluetooth module can pair two devices, we also pair the laptop. Which device is powered on first, and the signal of that device is played first. If both devices are not powered on, the signal will be Line in behind the radio. Terminal input function, so that the original function is not lost at all.
This is very simple. Go to Taobao and search for a Bluetooth decoder board, which costs more than ten yuan each. Then plug the audio cable into the input port of the Bluetooth board. The power supply voltage of the Bluetooth version is 5v. The power supply port Just like an ordinary Android phone charging port, just plug it in and use it!
The most direct way is to buy a receiver on a certain website. The prices for power amplifiers vary! !
If you have Bluetooth headsets that you don’t use, you can also change them. You can also use it by connecting the speaker wire to the connector. The best thing is a two-channel Bluetooth headset. It depends on what you like. If you have strong power, you can assemble one yourself, but most people don’t recommend this! Thank you
Buy a Bluetooth audio receiver, an ordinary one costs tens of yuan, a good one costs two to three hundred. The output end of the receiver is connected to the input end of the power amplifier via a wire. The mobile phone or player is Bluetooth paired with the receiver, that is Can! I used this one, it cost more than 200, and it works great!
Hope this helps you
It depends on your existing tools! If you have an electric soldering iron and soldering wire, just buy a module and modify it yourself! No tools, just buy a ready-made Bluetooth receiver!
Mobao has Bluetooth audio boards, ranging from a dozen yuan to a hundred yuan. You can choose according to your own speakers. Most of them come with digital power amplifiers, which are suitable for small speakers. For large speakers, you need to purchase the power amplifier separately. Board
You can buy a Bluetooth speaker online for more than 40 yuan. Or if you are a customer of China Mobile and have more than 2,500 points, you can exchange it for a Bluetooth speaker in the China Mobile Points Mall. It’s so convenient. You can make it yourself. , just slap yourself in the face!