How to change the ordinary audio can become Bluetooth audio?

Make ordinary speakers instantly become Bluetooth speakers, it is so simple

Many people have ready-made audio equipment at home, but the function of the old amplifier is limited, in the era of network lossless music in vogue, tight playback of songs on the cd disk, the heart is not willing! If you want to use the amplifier to play music on the phone how to do? With 3.5 to Lotus connected to the amplifier, the use of many inconveniences, and cell phone headset interface after the conversion of the sound quality is really not to be commended. For many users, the home of the speaker no problem, if you deliberately go to buy a set of Bluetooth speakers feel a bit of a waste, how to do?

How to change the existing audio equipment at home to Bluetooth audio?

Method 1: Do it yourself

A treasure to buy Bluetooth audio receiver module, do it yourself diy.

Open the cover of the amplifier, directly welded on the board at the output of the amplifier. The circuit is only for reference.

Usually, the store will give you the corresponding diy tutorial.

This method is the most cost-effective but not at all labor-saving, and is not recommended if you are not very hands-on and do not have the appropriate tools. And the quality of the module is not equal, with the original amplifier system is compatible, and another thing, sound quality and other aspects are difficult to guarantee. Then, for those who do not want to toss, we recommend a more simple and trouble-free method with good sound quality.

Method 2: Buy a Bluetooth receiver

Recommended: Tianyi BTS-1 Bluetooth receiver

Price: 280RMB

Appearance: BTS-1 Bluetooth receiver is an independent black box structure, the box adopts the black high-gloss casting process, the details of the fine eye-catching.

Functions: LINE OUT (analog L/R audio), digital coaxial (COAX), digital optical fiber (OPT)

How to use:

1. Connected by optical fiber: that is, one end of the fiber optic cable (GQ-1) is connected to the BTS-1 Digital Optical Fiber (OPT) output connector, and the other end is inserted into the fiber optic inlet of the amplifier, and select BTS-1

2. Digital coaxial (COAX) cable connection: i.e. one end of the coaxial cable is connected to the BTS-1 output connector, and the other end is inserted into the coaxial inlet of the amplifier, and the BTS-1 switch is selected to toggle Digital.

3. Audio analog Lotus terminal connection: i.e. a pair of audiophile audio signal cables are inserted into the L/R connector of the BTS-1 output connector, respectively.

Next, open the cell phone system settings - Bluetooth, the phone and BTS-1 pairing can be.

What's in store for you:

The BTS-1 uses patented APTX technology for high-tech Bluetooth? hi-fi transmission, which compresses linear audio samples down to 1/4 of their original size without noticeable degradation of sound quality and with low latency (uncompressed audio uses a 1.411Mbps bandwidth to achieve CD-quality audio), and outputs SPDIF digital signals, as well as stereo analog audio signals. Audio signals, especially with optical or coaxial digital cable output signal for SPDIF digital signals, the sound effect is particularly good! Better than stereo analog audio signal! Can indeed be comparable to the CD player to play the original CD disk sound quality tone! Bluetooth transmission audio than the general better sound quality tone effect, is a number of high-fidelity audio to obtain a digital audio signal source and cell phone library to achieve high-fidelity Bluetooth music playback indispensable tool.

Bluetooth (Bluetooth) itself is a wireless data transfer protocol, initially to achieve short-distance data exchange between devices, Bluetooth using the 2.4G box band, was proposed by Ericsson in 1994, the biggest advantage is that the Bluetooth protocol to support the connection of multiple devices.

With the development of Bluetooth technology, Bluetooth technology alliance now has more than 20,000 members of the company, covering communications, computers, personal digital products, audio and other fields, the earliest appeared in the cell phone communication, later, industrial products and consumer products are using Bluetooth technology. Began to be used as audio transmission, the use of Bluetooth protocol version of the low, then mainly used for cell phones, wireless headset, then only support mono, poor sound quality (decoding accuracy is not high) power consumption and other characteristics, so until now, some stubborn old audio enthusiasts always think that Bluetooth is used for audio transmission on the talk is not high-fidelity. In fact, the current version of Bluetooth 4.2, the sound quality has been greatly improved, the transmission distance of more than 10 meters, power consumption has been reduced.

Because of the ease of use, and the phone is currently, Bluetooth is the standard, because to facilitate the connection of a variety of consumer electronics products, such as bracelets, headphones, blood pressure monitors, balance cars, etc. If the home has a Bluetooth stereo, connectivity is much more convenient, the phone as a source of sound, you can always bring their favorite songs around, play at any time.

Ordinary audio to become Bluetooth audio is also very simple, there are two ways,

First, buy the finished product

This kind of product is more at present, such as millet Bluetooth audio receiver, tens of dollars, built-in battery, do not have to worry about the introduction of the AC noise. As long as a 3.5mm audio cable and audio connected, the audio upgraded to Bluetooth audio, very convenient.

Second, DIY

Do-it-yourself (DIY) can be in the process of making the feeling of fun, and enrich their knowledge and skills, science and technology men must try. The following is a Bluetooth receiver I made and two stereo Bluetooth module.

1, the production of Bluetooth audio receiver

We have to prepare the following materials, two RCA sockets, 1200mAh lithium-ion battery, Bluetooth 4.0 protocol stereo transmission module, a switch, a MicroUSB interface, in addition to some of the necessary resistance to capacitance of the original.

Find a small plastic box and punch holes for the various connectors.

Batteries and modules and plugs are mounted and glued, and various wires are soldered.

We use the sound is a bridge amplifier and bookshelf HIVI speakers

2, Light Cavalry M7 plus Bluetooth module

This is the Light Cavalry M7 speakers, using active mode, the so-called active is the speaker internal power amplifier unit, external as long as there is a signal input, can be sounded, and passive speakers is the need to be equipped with a power amplifier (referred to as amplifier, commonly known as amplifier to promote the sound, and the power amplifier is a power amplifier (commonly known as amplifier). Commonly known as amplifier) to promote the work of the speaker, the benefits of active is highly integrated, easy to install, the user input cost is low; disadvantages because of internal transformers, circuit boards, etc., to take up a certain amount of space, resulting in a reduction of the effective volume of the box, the amplifier circuit is simple and lead to sound quality is impaired. Therefore, the active mode is usually used in the design of small speakers.

In order to upgrade, we prepared a set of 4.0 Bluetooth stereo modules, including a blue LED status indicator and a power decoupling capacitor.

Inside is a power amplifier composed of LM1875, the circuit is relatively simple. Now we put the Bluetooth 4.0 stereo module into the circuit: the original signal input line from the amplifier board welded down, welded to the audio input of the Bluetooth module, and then the Bluetooth audio input is welded to the input of the amplifier, so that when there is a Bluetooth link, the Bluetooth output signal is played, and when there is no Bluetooth connection, it is automatically switched to the original audio input.

Because the Bluetooth module working power is 3.3-5V, and the speaker's working voltage is 18V, so also assemble a DC/DC step-down module to reduce the main power supply 18V to the Bluetooth working voltage.

Then we stick the Bluetooth module on the top of the speaker with 704 adhesive, and the Bluetooth antenna is glued to the internal front.

Assembled, there is one more LED on the panel, blinking means waiting for pairing or linking, and constant light means Bluetooth link is successful.

3, the old recorders retrofitted with Bluetooth modules

This one has become the "king of recorders" SHARP GF777 large volume, in terms of frequency parameters, even today is not backward, and today used to listen to FM, the sound quality is still satisfactory. Unfortunately, the popular cassette tapes of the day have been wiped out, and it would be a shame to use them only for FM listening.

Through the analysis, this circuit board board is the LINE input circuit PCB, this single in-line 9P IC is PHONO amplifier circuit, this we do not move it. Find these three pads, is the LINE or PHONO amplified circuit output point, we need to connect the Bluetooth decoder module here.

Prepare a Bluetooth decoder module. Then prepare a 2.4G antenna.

This is the soldered Bluetooth module, now we need to find a suitable location to install into the recorder. It is intended to be glued to the top of the inner wall of the recorder, along with the antenna.

This is what it looks like when it's glued in place, with the decoder module on the left and the Bluetooth antenna on the right.

Finally, add the power supply, then cover the shell, turn on the power, search for the Bluetooth module, after pairing the name to "SHARP GF777", so a Bluetooth decoding function of the recorder has been transformed.

Play tape, function switch on TAPE, radio on Radio, if you want to connect to a cell phone, put the function switch on Line in, at this time, if there is a bluetooth has been paired with a cell phone to play the music in the cell phone, due to the bluetooth module can be paired with two devices, we put the laptop is also paired with the first device to boot, the priority of the device to play the signal, if the two devices are not on the signal, if the two devices are not powered on, priority to play that device! If both devices are not powered on, the signal will realize the Line in terminal input function behind the recorder, so that the original function is not lost at all.

This is very simple, you go to Taobao to search for a Bluetooth decoder board, more than a dozen dollars a, and then plug the audio cable into the input port of the Bluetooth board can be Bluetooth version of the power supply voltage of 5v, power supply port and the same as the ordinary Android phone charging port, plug up to use!

The most direct way is to go to a certain treasure to buy a receiver, applies to the price of the amplifier has more or less!

If you have a Bluetooth headset that you don't use, you can change it. Connecting that speaker's wire to the connector will also work. The best is a dual channel bluetooth headset. It's up to you. You can also assemble one yourself if you have the power to do so, which is not generally recommended! Thank you

Buy a Bluetooth audio receiver, ordinary tens of dollars, good two. Three hundred, the receiver output and amplifier input wired connection, cell phone or player and receiver Bluetooth pairing, you can! I use this, more than two hundred, the effect is good!

I hope this helps

Depends on the tools you have available! If you have a soldering iron and solder wire, buy a module and modify it yourself! If you don't have the tools, buy a ready-made Bluetooth receiver!

Mobao has a Bluetooth audio board, from a dozen to a hundred dollars, according to their own audio options, most of them take away the digital amplifier, suitable for small audio, large audio need to buy a separate amplifier board

Online more than 40 dollars to buy a Bluetooth speaker, or you are a customer of the Chinese mobile company, there are points more than 2,500 points, you can be in the mobile points mall in exchange for a Bluetooth audio, how convenient is to buy a Bluetooth audio, and how to use the Bluetooth audio, you can use the Bluetooth audio, and how to use the Bluetooth audio. Bluetooth audio, how convenient, make your own, is to slap yourself!