Homemade bluetooth speaker - how to make it yourself in just a few minutes? Homemade Bluetooth speaker with your own hands Making a large Bluetooth speaker.

From an old bluetooth headset with a 3.5mm jack audio connector.

I think it’s no secret how it works bluetooth headset.
This article describes how to make more universal device for wireless playback of music files while maintaining headset functionality.

This homemade product will be useful for drivers (for making and receiving calls through the standard audio system), for listening to music through an AUX connection or on headphones.

We will need:
1. Bluetooth headset
2. Audio connector 3.5mm jack
3. Pair of wires
4. Heat shrink
5. Super glue

From the tools:
1. Soldering iron

Step 1.
We will need a 3.5mm jack audio connector. You can get it from old equipment, as I did, or buy it at any radio store.

Step 2.
We carefully remove the speaker from the headset and unsolder the wiring from it.

Step 3.
We place our 3.5mm jack audio connector most conveniently and solder the wiring according to the pinout and glue it with super glue.

Pinout

Since the headset produces a mono signal (for one channel), we will combine the right and left channels into one, soldering them together with wiring. The photo shows that two red wires are soldered to one channel. One goes to the headset, and the second connects the right and left channels. Now the mono signal from the headset will be sent to both channels. If this is not done, then when listening to headphones only one side will play, the same with any audio system.

Step 4.
Now we put on heat shrink to insulate the contacts and aesthetically appearance.

This completes the modernization. Connect headphones or AUX cable and check.

The built-in battery will not work for long. Therefore, take care of additional power supply to the receiver for long-term operation.

Video recording step-by-step assembly and operation of the device for familiarization.

The word Bluetooth is the technology for transmitting data over a radio channel over a short distance of several meters, for communication between mobile phones, computers and others. digital devices. Bluetooth interface is different low level energy consumption and low cost. Currently used most often for communication between cell phones and wireless headsets. The Bluetooth radio interface was intended for transmitting data and voice messages.

In the traditional version of the headset, the Bluetooth module has a small chip lithium ion battery 3.7V 50mA, microphone, speaker and power button.

The low cost of the hardware, a good degree of protection and ease of use have made this standard very popular. Bluetooth uses frequencies in the region of 2.4-2.48 GHz and does not require licensing. Currently, the global industrial community has accepted this technology as a general standard.

The user experience that Bluetooth technology provides is sure to be hugely popular. Let's say, when you come to the office, your pocket computer is immediately automatically synchronized with your desktop PC, new contacts are transferred to your mobile phone, etc.

The Bluetooth module contains a forming, receiving and transmitting part of the equipment and a built-in software. Communication between the module and the host controller is made using a high-speed USB interface or a UART/PCM interface. The host controller interface in the Bluetooth module is the command interface. The host sends commands through the IHC, and in response receives messages from the module about their execution; The communications manager sets up the required host controller configuration.

Bluetooth has two communication options: synchronous and asynchronous. The first type is designed to establish a symmetrical connection and is used for voice transmission. The information transmission speed is 64 Cit/s. The asynchronous version is designed for packet data transmission, the transmission speed is 720 Kbps. At the beginning of the block there is an access code, followed by a packet header containing checksum packet and information about its parameters, and at the end an area directly containing the information being sent.

The diagram of one of the Bluetooth radio modules is shown below:

The frequency spectrum allocated for Bluetooth has a range of 2.402...2.480 GHz, which is divided into several channels. The bandwidth of each channel is 1 MHz. Channels are changed according to a pseudo-random law. Constant alternation of frequencies allows the radio interface to broadcast information over the entire range and eliminate interference from other devices. If this channel is busy, the system will switch to another one that is free from interference.

Discuss the article BLUETOOTH DEVICE DIAGRAM

Wireless devices have a number of advantages over conventional ones. One of the most significant advantages is mobility, the ability to take such a device with you on any trip. However, wireless speakers also have a high price, which makes their purchase impossible for a number of citizens. Then on help will come simple instructions for making a Bluetooth speaker at home with your own hands.

REFERENCE! To manufacture such a device, you will need not only all the basic elements that will be listed below, but also basic assembly and soldering skills from the user.

What you need for work

• For full sound, devices will need speakers. In total you should take 4 of them: two under low frequencies, two under the top ones.

REFERENCE! It is not necessary to use exactly 4 speakers. There are options for a three-speaker build. One of them acts as a subwoofer, the other two are responsible for reproducing high frequencies. You can also use two identical speakers, which will not be separated in frequency.

• Crossover with two channels(2 pcs.).
• Two passive membranes.
• Battery.
• Charger.
• Amplifier.
• Bluetooth module.
• Boost converter.
• Power connector.
• Switch switch.
• Case material.

REFERENCE! The optimal material for assembling the case is plywood, since it is easy to obtain and easy to process.

Materials and tools

To make a homemade speaker you will need a number of tools and materials.

• Glue.
• A hacksaw, jigsaw and other tools for working with plywood or any material that will serve as a housing for the device.
• Marker, pencil and other items for marking.
• Ruler

Assembly diagram

As can be seen from the diagram, the speakers are connected via HF and LF pairs to the crossovers, which receive the signal from the amplifier. This was done to provide better sound quality to the device. To increase the sound quality of low frequencies, you should also install a low-pass filter between the crossover and the woofer, which will remove all upper harmonics, providing high-quality and deep bass.

Information from the Bluetooth module is sent to an amplifier, which is designed to pre-filter and amplify the signal. The amplifier module itself is powered by batteries (or rechargeable batteries). The voltage from them rises to 14 V and is supplied to the input of these two elements.

A protection board should also be placed between the supply voltage and the boost module, which will provide the device with short circuit protection.

A simple way to make bluetooth speakers

First of all, to make such a device you will need frame. The best solution will be its production made of plywood.

Important! When choosing the size of the case, you need to take into account that it must accommodate not only all the electronic components, including speakers, amplifier and battery, but also passive membranes.

Panels

On the front panel it is necessary to make holes for 4 types of speakers. A pair of large holes are intended for woofers. Smaller holes are needed for tweeters. The devices should be placed in pairs, a pair of LF and HF on the left and right.

The rear panel should contain passive membranes, as well as charging connectors and a power switch.

REFERENCE! The best material for gluing plywood parts is wood glue.

The side panels must be sealed and treated, since damage to their integrity will lead to a deterioration in the sound quality as a whole and the appearance of unwanted vibrations in the case.

On the rear panel, as mentioned earlier, there are passive membranes that significantly increase the depth of the bass. They are not electronic devices and do not require inclusion in the scheme. The membranes are attached to the body with helium super glue.

REFERENCE! In order to reduce the body's own vibration, you should glue a couple of MDF strips. This will prevent unwanted sounds caused by panel vibration.

Assembly

After all the component parts of the case are ready, you should begin assembling the electronic components.

Nutrition

You should start with nutrition. If the voltage is supplied from batteries, an additional protection board will be required. Because lithium-ion batteries are very sensitive to both short circuit and overcharging.

IMPORTANT! You should make sure that the voltage on all battery cells is the same. Otherwise, the device will work for a very short time.

Along with the protection board, you should also connect the power switch. When connecting the latter, the polarity must be observed, otherwise the device will fail. To check this, you should first connect the battery and check the voltage.

Bluetooth

The next step would be bluetooth connection module. This element has separate outputs for power and separate outputs for audio. The module itself already has an ADC and a receiving antenna, so it will receive and process the signal itself. Power to the module will come from the protection board to special contacts.

REFERENCE! This element should be located in an accessible place so that the user has the ability to turn it on/off, as well as pairing and configuration at any time.

The Bluetooth module, in turn, should be connected to the amplifier via a step-up stage.

The signal from the amplifier will go to crossovers, the main task of which is to separate the sound into high and low frequencies. The corresponding speakers are connected to the corresponding output.

When all the elements are connected, they should be placed on the back panel. It is advisable that the wires do not cross each other. This may cause unnecessary interference that will affect the sound quality.

After all the parts have been placed, the front panel should be secured. The jbl portable speaker is assembled and ready to go.

Options for portable Bluetooth speakers that you can make yourself

There are many variations in assembling Bluetooth speakers. You can use not four, but two identical speakers, to which the same sound will be supplied. Such a device will have smaller dimensions, but the sound quality will be somewhat worse.

There are also assembly variations with two tweeters and one large subwoofer.

Whether a speaker is powerful or not depends on its components.

REFERENCE! The larger the size and power of the speakers, the greater the battery capacity will be needed to maintain normal operation of the device.

If the user needs a very small portable speaker, then you can assemble such a device using only one speaker. To do this, you only need the speaker itself, a battery (can be used from an old phone), a Bluetooth module, a charging module, an amplification stage and a power switch.

• First of all, you need to place the battery in the case. Connect the charge module to it, which is equipped with two LEDs signaling the charging process.
• The Bluetooth module and amplification stage should also be connected to the battery. Element to provide wireless communication must be connected via a power switch.
• From the Bluetooth component, the signal will be sent to the speaker through an amplifier. The module itself has corresponding outputs that should be connected, observing the polarity.

There are a few basic tips to keep in mind when assembling.

• Don't forget about grounding.
• Should be observed polarity. Otherwise the device will fail.
• Wires, which connect the elements, should be done as briefly as possible, and they should not intersect with each other.
• The housing must be sealed, since if there are unintended holes, they can vibrate, creating an unpleasant sound.
• All basic elements must be easily accessible.
• The components must be securely glued to avoid damage during transportation.
• To avoid short circuit, V All elements should be checked for polarity when connecting.
• The main elements that are responsible for adjustment and configuration (Bluetooth module, power switches, amplifier with gain control) should be placed so that control of their parameters is comfortable. It is also necessary to take into account the possibility of replacing one of the components without having to completely disassemble the entire device.

The presence of Bluetooth (English blue tooth) in modern devices has long been considered the norm. Almost everything mobile devices are equipped with such modules. Why do we need it, this Bluetooth, is a question that any first-grader can easily answer today. A desktop PC, unlike laptops, netbooks and tablets, is equipped with “blue-tooth technology” as an option. The absence of this option is not a reason to shed bitter tears over system unit pet It is possible using bluetooth adapter, in a few minutes, make available all the conveniences that this technology provides to its users.

How is this possible? This will be discussed in our review. But first, a little history. Bluetooth technology is a way to transfer information, control devices, connect multiple devices to a local network, etc. All this can be done without using a wired connection. Back in 2000, several companies first announced devices with this technology on board. At that time, it was simply fantastic: transferring files wirelessly was beyond comprehension.

A little more than ten years have passed and Bluetooth as a wireless technology has become commonplace. keyboards, mice, printers, cameras, laptops - all these (and not only these) devices can now work and “communicate” with each other without wires. Despite the fairly advanced age of the technology, it still enjoys well-deserved demand and popularity among manufacturers and consumers. The undoubted advantages of the “blue tooth” include stability of operation, minimal impact of interference on the operation of devices, as well as the low cost of such equipment.

If a computer or laptop is suddenly not equipped with a Bluetooth module, this defect can easily be corrected by a Bluetooth adapter. And for this you need very little money. On average, for $5-10 you can purchase a Bluetooth adapter that connects to a PC via a USB port. The miniature nature of some models allows them to be used as portable devices; they are almost invisible and do not cause any inconvenience. When the need arises to use Bluetooth, with a slight movement we insert the adapter into the USB port and... that's it, complete freedom from the ever-tangling wires.

What is required for installation? Minimum kit:

• Device driver and software for operation (included);
• Free USB port on a computer/laptop.

The installation procedure is simple. A Bluetooth adapter is inserted into the USB port, and a Bluetooth adapter is inserted into the disk drive. installation disk. We launch the installation program. We agree with all the suggestions and continue the installation anyway, even if suddenly “...the equipment has not been tested...”. After installation is complete, you need to check that the Bluetooth adapter is in the list of devices.

Now you can easily connect various devices with your PC, send and receive files, use a communicator modem or mobile phone to access the Internet, which is very important in the absence of alternative options for accessing the Internet.

Among competitors in the wireless market, two trends can be noted: the gradual departure from the scene of infrared communications (IrDa) and the steadily growing popularity of the IEEE 802.11 standard (aka Wi-Fi).

Through the infrared port it loses its relevance - devices should only be in line of sight, the transmission speed leaves much to be desired. Manufacturers have practically stopped installing it in their devices. We can say that it has been successfully replaced by Bluetooth.

Which is better, Bluetooth or Wi-Fi, is not the question. These two wireless communication standards have been living peacefully in a “civil marriage” for many years, sharing responsibilities among themselves. Wi-Fi is local network and Internet access, Bluetooth - data transfer, Hands free, connection with various computers, etc. This symbiosis provides customers with one clear benefit - most devices with this sweet couple “on board” provide the maximum degree of freedom. By the way, you can install both a Bluetooth adapter and a Wi-Fi module on your PC yourself. But this is a completely different song...

Recently, more and more often you can meet people who listen to music not through headphones, but through the use of Bluetooth speakers. This portable device is a housing in which, along with the speakers, there is a battery and a receiver that receives a signal from the phone via a Bluetooth channel.

Portable speakers have a pleasant sound and high volume; unfortunately, their purchase often involves significant financial expenses. Let's look at how to make a Bluetooth speaker with your own hands, while saving a decent amount of money.

Required Components

Before you begin manufacturing, you need to make sure that all the required elements are at hand. These include:

• An old small speaker or a housing and two speakers.



• A Bluetooth receiver that receives a signal from the phone and transmits the sound of the melody to the speakers. You can order this component in China or in an online store located nearby. Typically, such products are relatively inexpensive. Currently, the receiver can be purchased for $6 including shipping.



• Battery from an old phone. The larger the battery capacity, the longer the speaker will work without the need to connect to a charger.



• Sound amplifier (from $0.5 on Aliexpress). The current example uses a Class D amplifier, model pam8403, 5V.



• You will also need a working soldering iron, solder, sealant or glue.

If all the required components are already on the table and ready for use, then you can begin assembling the device.

Powerful DIY Bluetooth speaker

The first stage of manufacturing is to become familiar with the bluetooth receiver circuit. To do this, you need to disassemble its body. Inside there is:

• antenna;
• Bluetooth receiver;
• memory;
• charging controller;
• two LEDs displaying the charge level and the process of replenishing the capacity;
• sound amplifier;
• capacitor;
• power on/off switch;
• sockets for connection are also soldered on the board charger(Micro-USB) and connecting headphones or speakers via a 3.5 mm jack.

On the back side, depending on the receiver model, there may be a small battery. It will need to be replaced with a more capacious one to increase the time battery life columns. This is the only modification that will be required on the purchased receiver.

Connecting a high-capacity battery

Do-it-yourself battery replacement for a Bluetooth speaker is carried out as follows:

• The soldering iron heats up and its tip solders two contacts (plus and minus) on the board. The procedure ensures that a battery with a low capacity is disconnected. Then you can peel it off and put it away or leave it in the case.



• Two wires are soldered onto the prepared battery (if it is removable). In the case of non-removable batteries, everything is simpler - there the contacts come straight from the case, so you don’t have to solder anything.
• Observing polarity, solder the wires to the receiver board. The battery and receiver are marked with positive and negative polarity contacts.



• Check the work done by turning on the device. The LED indicator should indicate this.

Soldering amplifier contacts

The next major step in creating a homemade portable speaker is to solder all the necessary contacts to the amplifier. Let's analyze this procedure step by step in the context of connected elements. So, to connect the amplifier to the receiver you will need to solder three wires from the mini-jack plug to it. This is done like this:




At this stage, the signal arrives from the receiver to the amplifier, but does not pass further, since the wires from the two speakers are not connected to it. At the top of the board is the “Out” mark, and next to it are two sets of pins (plus and minus). The do-it-yourself bluetooth speaker connection diagram is as follows:

• Two wires come from the speaker responsible for the left channel - plus and minus. They should be connected to the corresponding pins on the board (they are marked “L”). The channel for the speaker is selected randomly.
• From the speaker that is selected to play the right channel, also take two wires and solder them to the circuit. The place in this case is indicated by the letter “R”.

Now the speakers are connected to the amplifier and receiver, which means the connection of all the necessary contacts is almost complete. All that remains is to supply power to the amplifier: If everything is functioning properly, the components are assembled inside the speaker housing.

This completes the assembly. If you want to get a more accurate option, you will need:

• Unsolder the charging connector and switch.
• Make them remote by soldering wires of the required length.
• Make holes in the housing to install the specified elements.
• Install using epoxy resin or other durable substance.

In this case, all working elements will be hidden under the body, which will give the Bluetooth speaker an attractive appearance and similarity to the mass production model.

As a result, a homemade portable speaker will cost the owner 7-8 dollars, which is significantly less than the prices of the cheapest ready-made options offered by manufacturers. Before starting work, you will have to purchase the required elements, so the process includes a little preparation. The only tools you need are a soldering iron and some thin wires. If you strictly follow the instructions, assembling and soldering the contacts will not cause any difficulties; in addition, all connection points are marked accordingly on the boards.