How to make a bluetooth speaker from a regular one. How to make a simple Bluetooth speaker

CubeBox is a DIY ultra-portable wireless speaker with impressive bass and an attractive design.

Distinctive features:

• high efficiency of audio effects due to the use of 65 mm stereo speakers
• Long battery life - up to 8 hours of continuous music playback.
• Pairing is possible with any Bluetooth – compatible devices, including smartphones, MP3 players, tablets and computers.

Technical Specifications:

• Two full range 3W stereo speakers.
• High efficiency amplifier PAM8403.
• Long lasting 5200mAh battery.
• Micro USB charging.
• Bluetooth

Speaker manufacturing

Video instructions for production

Materials and tools

We need these following parts and tools to make this Bluetooth speaker.

Materials

• Stereo amplifier module PAM8403;
• 3W stereo full range speaker – 2 pcs.;
• Micro USB charging module;
• Bluetooth module;
• 18650 li-On battery – 2 pcs;
• DC switch;
• Boost Converter;
• wires;
• Acrylic sheet 4 mm thick.

Tools

• Metal saw;
• Bor machine / Dremel (optional);
• soldering iron;
• Glue gun;
• Wire cutters and strippers;
• sticky tape.
• superglue.
• Marker.
• Crown.
• sandpaper or file

Case manufacturing

We glue the speakers using a glue gun, there are very important point. It is necessary to go very well along the edges with glue to ensure a tight fit to the acrylic wall.

The sequence of gluing the walls of the body.

Gluing the cut out parts of the future column can be done using quick-setting glue.

First apply superglue to the edges of the frame with the speaker speaker, then carefully position the 2-wall with the speaker and hold it a little until they are well glued.

After this, you can glue another wall.

For fixation, you can use various devices as you wish.

Soldering modules

The most interesting part of the assembly for many is the soldering of components; everything is very simple here:

First, let's connect the amplifier and Bluetooth module BT162

Turn on and heat the soldering iron.

Connect the power wires (red and black) to the amplifier, then the wires (green, yellow, blue) to the audio input, be sure to make sure the polarity is correct.

Add a power module.

Using this module, you can increase the voltage to the required 5 volts.

A blue potential meter is used to regulate the voltage. Solder 2 wires to the step up module and to the charge module.

Installation of housing components

Charge module and switch

First we glue the charge module, for this we use a glue gun. It's fast and cheap. Then glue the switch and solder the wires from the charge module to the switch.

Battery

Solder and glue 2 together batteries type 18650 and glue the assembly onto the wall of the rear panel. Where the charge module was placed.

Installation of main modules

First we install the voltage converter, then the remaining modules, we fasten everything in the same way using thermal glue.

After installing the components, we perform final soldering.

We solder the power wires from the step module to the switch, do not forget to check the polarity, this is very important.

Gluing the back panel.

After all the components are assembled, glue the remaining walls of the case, carefully apply glue and hold the walls until the glue sets.

Apply a generous amount of superglue to the edges first, then carefully attach the back panel and hold it in place for a bit until it is properly stuck. Finally, apply hot glue to attach the back panel more firmly.

After attaching the back panel, we solder the speaker wires to the amplifier and check everything for functionality. Final assembly.

After which you can glue the remaining parts of the body. After gluing, you can use sandpaper and a file to clean the edges of the walls from traces of glue.

That's all the instructions, I hope you liked it.

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 They also have a high price, which makes their acquisition impossible for a number of citizens. Then it will come to the rescue simple instructions for making Bluetooth speakers 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 playback 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 you need 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! Make sure that the voltage across 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 both 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. Portable jbl column 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 such a device can be assembled 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, in 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.

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 a more versatile device for wireless music playback 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

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

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

Everyone brainiacs Hello! I’ll tell you today how, after almost two years of studying the topic, designing and testing, I made my own version of a Bluetooth speaker. Gives out mine homemade 40W of sound from paired tweeters, woofers and passive membranes, equipped with Bluetooth 4.0 with smart options, a “long-lasting” lithium-ion battery, and everything is “packed” into an elegant plywood case.

Characteristics brain games:

• Yamaha amplifier 2x20W,
• Bluetooth 4.0 module with battery charge indicator and grounding insulator,
• battery of 3 lithium-ion batteries with protection circuit and fast charging,
• 20W low-frequency speakers paired with tweeters and passive membranes,
• 6 hours of operation at full volume and 12 hours at medium volume.

How does it sound homemade? I will say that it produces sound even better than some high-quality industrial speakers, and to see this, watch the video presented!

How is this Bluetooth speaker different from other homemade speakers?

1. The Bluetooth module has a grounding insulator, which eliminates interference coming from the module itself, which affects most other similar devices. crafts. The same speaker has 100% pure sound.

2. You can monitor the battery charge level using your smartphone thanks to the smart monitoring option.

3. The speaker produces “uncompromising bass”, because it was specially designed to amaze with a very impressive sound, surpassing even industrial speakers.

4. The components used are cheap and reliable.

5. Homemade Easy to assemble/disassemble, just unscrew the screws.

6. Long operating time on one charge, and charging itself is quite simple.

Step 1: Required Components

All proposed parts have been carefully tested for compatibility and work perfectly in this combination. What is required:

• high-frequency speaker (“tweeters”) - 2 pcs.
• Bluetooth module with grounding insulator
• voltage boost module (boost converter)
• plywood 18mm thick
• plywood 3mm thick.

Templates for laser cutter.

Step 2: Design the Front and Back Panels

On the body design of this brain games I was inspired by layered wood. Looking at it, you might think that it is assembled from 10 layers folded together, but in fact the body consists of three layers of 18mm plywood, which are glued together, and two more layers of 3mm plywood on the front and back sides . The design of the case is such that it has a volume of about 2.25 liters, which is perfect for electronics and selected passive membranes.

Making the front panel:

The most in a fast way The creation of panels is laser cutting, and my laser cutter could not cope with plywood thicker than 3mm, so for greater strength, I made the front panel from two glued parts, and which was additionally reinforced with strips of MDF. I note that all the wooden parts in this brainproject glued together only with wood glue. The front panel has holes for tweeters and low-frequency speakers, as well as for access to electrical components. On the back panel there are holes for passive membranes, as well as small holes for the charging connector and switch.

If you are designing your own panels... then I would still suggest making a hole for quick access to electronic filling homemade products, which is very useful if something requires adjustment or repair.

Step 3: Making the Side Panels

After this I started creating the side panels and made them from high quality 18mm plywood. Each layer of this brain plywood 3mm thick, and its outer sides are thin veneer. I also recommend you use plywood high quality, since the inner layers of the “sandwich” body must be sufficiently hard and tightly compressed. When cutting lower quality plywood, it will split or even fall apart into layers. To cut out the side components of the body, you only need a jigsaw and a drill with a crown or wood drill.

First you need to attach the front panel to the plywood and trace its outline, and then repeat it inside at a distance of about 8mm from the outside, it can be thinner or thicker, depending on the quality of the plywood itself and your experience (you will quickly figure this out). Then you need to drill 4 holes in the corners of the internal contour, so that part of the circumference of these holes coincides with the internal contour, and then use a jigsaw to complete the contour completely.

Having cut out the inner contour, the part is cut out of the plywood sheet along the outer contour.

Step 4: Gluing the Side Panels

The side panels are simply glued together with wood glue, lots of wood glue. The coated panels are stacked and pressed tightly with some kind of weighting agent, or compressed with clamps, and left in this state until the glue dries.

When the side of the body homemade products When it dries, the protruding parts are ground off with a jigsaw or on a circular table so that it takes on an even, streamlined shape. This can also be done by sanding, but then it will take more time. Next, the inside of the side part should be covered with a thick layer of wood glue, so that after final assembly brain trick was sealed.

Step 5: Preparing the Back Panel

Passive membranes are glued to the back panel, which are an alternative to a bass reflector and allow you to expand frequency range speakers, but in a more compact version. They do not require connections to electronics, they simply respond to pressure changes within the housing (that is, when the main speakers move outward, the membranes are pulled inward, and vice versa). And therefore it is very important that the finished body brain games was 100% sealed.

Passive membranes are glued to the panel with super glue, in in this case It is better to use gel super glue, since it is not so hard and allows slight movements, unlike regular super glue. You should also add several MDF strips to the back panel so that it does not bend, using the same gel super glue for this. After all, any vibrations of the body will spoil cerebral sound.

Step 6: Electronics Placement

As you can see in the presented photo, inside the case crafts there are quite a lot of electrical components located. Before you place all that electronics, it's important to find the correct position for each component and make sure everything fits as it should! It is also important to find such a position for the electrical parts so that they can be accessed for repairs if necessary.

In this brain work I placed parts so that boards such as the amplifier and Bluetooth module were easily accessible, and placed the crossover, which most likely would not need to be checked, further away from the service hole. This crossover is located directly under the hole for the right subwoofer, so if necessary, you can still access it by unscrewing the speaker itself. The remaining electrical parts are located under the service opening, that is, they are easily accessible.

Step 7: Circuit Diagram

The figure shows a diagram for assembling an electrical circuit homemade products. If you use the same components as in the proposed parts list, then assembling the electrical circuit is quite simple, you only need a soldering iron and solder (well, and cable ties to make everything more neat). The length of the wires depends on how you arrange the electrical components, you just need to know that the smaller the wire allowances, the better.

If you don't know much about electronics, or want to understand it better, then read the following steps. And if you are not interested, then feel free to skip the theory.

Step 8: Battery Pack Operation

For many people safe use Lithium-ion batteries seem confusing, but in reality it's not that complicated. Three things are important for lithium-ion battery packs:

1. The actual batteries.

2. Battery protection board.

3. Charger for lithium-ion batteries.

Purchasing lithium-ion batteries is very important, as there are many counterfeit batteries sold online. Therefore, the easiest way is to choose cheap, but at the same time real and reliable batteries, for example, Samsung’s pink 18650. Because they are cheap, then counterfeit them, that is, create even cheaper ones brain copies, not profitable. And as a result, we have inexpensive, reliable branded batteries.

The next point is the battery protection board, which prevents it from overcharging, over-discharging, short circuiting and much more. The exact protection functions vary slightly between boards. Such protection boards are a mandatory element, because lithium-ion batteries are very sensitive and require special conditions for their functioning, and without a protection board there is a risk of the battery catching fire/exploding, or it will simply “die”.

And finally, the charger itself for lithium-ion batteries is also important. These chargers directly charge brain batteries, and also, depending on their voltage, reduce power or completely stop charging, so you should make sure that your device for lithium-ion batteries is a CHARGER, and not a power supply. Many devices on the network are sold as chargers, but in reality they are ordinary power supplies, so when choosing and ordering of this device Be sure to read the characteristics and description!

For more information on charging and using lithium-ion batteries, go here.

Step 9: Assembling the Battery Pack

Before you begin soldering the battery pack, you must make sure that brain strain all batteries has the same value, since in otherwise this will confuse the protection board and may “kill” the battery during charging. If the battery voltage is slightly lower than required, then by assembling a special circuit, you can charge it separately and achieve the same voltage on all batteries.

Having balanced the batteries, you can begin assembling the battery pack. A battery case like this is worth purchasing, because it keeps the batteries compactly in one place; I only recommend resoldering the wires to thicker ones so that they can withstand the required power.

According to the above diagram, a protection board is soldered to the battery case, as well as a switch and power connector. When soldering the latter, be sure to do it correctly! (For better understanding, see photo). The right pin (bent) can be removed, the left pin goes to ground, and the middle pin is positive. Before soldering the connector into the protection circuit, you should place the charger in it and check the voltage with a multimeter to ensure the correct polarity of the connector contacts.

Next, to check the functionality of the supply circuit in braincase the batteries are inserted, and if everything is correct, the wires are compactly attached with tape to the back of the case. After this, a boost converter is soldered, after connecting it, you need to measure the voltage at its output contacts with a multimeter. The voltage we need is 14V, and to get it we need to tighten the copper screw on the converter module board with a small screwdriver until the required parameter is obtained. Everything is the same as in the next view, only the board is different.

Step 10: Connecting the Bluetooth Module and Amplifier

To save space inside homemade products and the compact arrangement of parts, I attached the Bluetooth module to the amplifier board. If you decide to place them this way, leave enough free space between the amplifier and Bluetooth module chips, since both chips require air flow for cooling, and even if they come into contact, a short circuit may occur. I attached the module and amplifier boards to each other using hot glue. If you use a Bluetooth module from any other brain games operating from 5V, then I strongly recommend connecting a grounding insulator to the module power wires to avoid unwanted interference from the module chip.

The output contacts of the module are connected to the input contacts of the amplifier. If you want to use additional features Bluetooth module, now is the time. The easiest way to do this is to solder the buttons together, as shown in the photo. Next, the power contacts of the amplifier are connected to the output contacts of the boost converter, that is, the amplifier will be powered from 14V. But the Bluetooth module, depending on the voltage on the battery, will receive 10-12.6V, since it is connected to the input contacts of the boost module.

This voltage variation will be "monitored" by the module, and if you have Android latest version, information about the remaining time will be displayed next to the Bluetooth icon on the smartphone battery life columns. The Bluetooth module will work until the voltage drops to 10.5V, and it works great with 3S batteries. DO NOT connect the module to a 14V power source as it is rated for a maximum of 12.7V!

Step 11: Connecting Crossovers

Let's move on to crossovers that will separate beep for high and low frequencies for tweeters and woofers, respectively. Once they are soldered, they can be used like other parts. homemade products, glue with hot glue. The switch and power connector are attached with the same glue. Once again I emphasize the importance of 100% tightness brain games, which is perfectly achieved using hot glue!

Step 12: Gluing the Side Panel

The time has come to glue the side panel, and to do this, wood glue is applied to the rear panel along the edges and it is pressed against the side panel. After the glue has dried, the seam from the inside of the case is sealed with hot glue, this will also add strength to the case itself.

Step 13: Preparing the Front Panel

As mentioned earlier, strips of MDF can be glued on to give the front panel a look. Next, the “squeakers” are glued to it, and since they are motionless, this can be done with hot glue. The tweeters themselves should now be connected by wires to the crossovers, since after attaching the panel to the body this will not be possible. But it’s not worth screwing in the low-frequency speakers yet; this will be done later, as soon as everything is glued and connected.

The edges of the front panel are coated with glue, it is pressed against the body crafts, and everything is left to dry completely.

Step 14: Service Port Cover

When the glue has dried, you can mount the low-frequency speakers - first connect the wires to them, and then secure them with screws. After testing the almost finished homemade products and received positive results, a cover is screwed on to cover the hole for servicing the electronics. After that brain trick cleaned and, if desired, coated with clear varnish to preserve its natural wood look.

All that remains is to say: ready! And, again at your discretion, you can attach fabric to the speaker and grille on the speakers by adding several additional layers of 3mm plywood, and glue the fabric to the underside of the top one.

Step 15: And finally for inspiration

I've written a few more on the topic of columns brain guides, by reading which you can get more ideas. And of course, if you are interested in this topic, you can find me on various

The idea of ​​owning a portable Bluetooth speaker has been haunting me for a long time. However, the price/quality ratio still did not reach a reasonable level, and still leaves much to be desired. There are excellent models on the market that deserve to be purchased, such as the JBL Voyager portable speaker. True, the price here is too high - about 220 US dollars. But you don’t really want to overpay just for a famous brand.

After all, in essence, all portable acoustics are ordinary multimedia acoustics + Bluetooth module + lithium ion battery. And if you combine these components yourself, you can get a budget option that is quite good in quality.

Spring is in full swing. And the need for portable acoustics is now very relevant. After all, you can take it with you to a group of people on the street, or on a trip out of town for a picnic, or wherever you need mobility, but there is no outlet. In other words, you finally need to acquire such a gadget! But the desire to save money has not disappeared at all. Quite the contrary. This means it’s time to roll up your sleeves and do everything yourself. So, let’s define the goal - quickly, without much effort, from available parts, assemble an inexpensive, high-quality portable acoustics, which is not inferior to ready-made gadgets and is significantly lower in price. Let's get started.

Brief plan:

1. Select multimedia acoustics.
2. Select Bluetooth module.
3. Select a lithium-ion battery (portable charger).
4. Connect all this with blue electrical tape.
5. Profit. Enjoy portable music with friends.

Selection of components.

1. One of the most important characteristics of portable speakers, in my opinion, is size and weight. Based on these mandatory criteria, we will look for the most popular and inexpensive model of multimedia acoustics. Ok, google) After analyzing the characteristics, the choice fell on the Sven 315 speakers. For a price of about 8 US dollars, we get very compact multimedia speakers with high-quality sound. A huge number of positive reviews confirm this. (http://market.yandex.by/product/6226111/reviews?hid=91107&track=tabs)

• Type 2.0
• Built-in amplifier
• Output power 5 W (2 x 2.5 W)
• Lower limit of frequency range 100 Hz
• Upper limit of frequency range 20,000 Hz
• Height 70 mm / Width 70 mm / Depth 65 mm
• USB powered

2. The next component is the Bluetooth module. A quick inspection of the sites www.dx.com and www.aliexpress.com found suitable modules for 6-7 US dollars (http://www.dx.com/s/bluetooth+audio+receiver+module). However, according to an ad on a local flea market website, there was suddenly an option that could be picked up tomorrow for $10. I didn’t really want to wait for packages from Chinese friends, so I bought what I had. My option (Bluetooth Music Receiver Adapter Dock Adapter Audio Stereo a2dp 30 pin)

This adapter is designed to connect to legacy docking stations with a 30-pin Apple connector. To pair newer i-gadgets (with a lightning connector) or Android gadgets via Bluetooth.

3. And the last component is the lithium-ion battery. Everything is simple here. Since our speakers are powered by a standard USB cable(5V), then we take any portable charger with a USB output and a capacity no matter how much you spare the money. (http://catalog.onliner.by/portablecharger/~fp=5v)
Here, the larger the battery capacity, the longer the music plays.

Assembly.

First of all, we need to disassemble the SVEN 315. I used the video instructions.

Then we disassemble the Bluetooth module and remove the board. This is only needed for my specific 30-pin model (for boards ordered from http://www.dx.com/s/bluetooth+audio+receiver+module this will not be required).

Having disassembled the speaker, we shorten the audio input wire and solder it to the Bluetooth module. We also branch and solder the +5v power supply from USB.

We secure everything inside with thermoplastic glue so that nothing dangles.

After installation you can check it. We connect the speakers via USB to a portable charger. And we pair it with the phone.

That's all.

We have created excellent budget portable speakers with which you can safely go on a picnic with friends.

Making a speaker that supports the Bluetooth Speaker wireless interface is easy and cheap. This idea will cost you no more than $14 dollars.

You may already have some components that you don't need to buy, such as 3-watt speakers.

In the following steps, I will try to offer the easiest way to assemble this Bluetooth speaker. Even beginners, I hope, will understand, since I myself did not have much knowledge of speakers, amplifiers and Bluetooth modules before making this speaker.

The portable speaker will provide long battery life if you use a 18650 lithium battery.

I used 3x 18650 lithium batteries in parallel. At the same time, the total capacity was 6600 mAh, which was enough to play music for 8 hours at the highest volume.

Charger portable speaker carried out via micro USB, which is very convenient!

Step 1: Selecting the necessary components

What do we need?
- Bluetooth stereo audio module
- Micro usb charging module 5 V, 1 A
- 2x3 W amplifier
- 2 speakers 3 W, 4 Ohm
These speakers had good reviews and sounded very good for their size!
- 3.7V 18650 lithium battery
- 100 µF capacitor
- Short wires and switch

Step 2: Assembling the circuit

Connect the components using wires as shown in the image.
It is best to glue the Bluetooth module to a printed circuit board. You can also add buttons to the module to adjust the volume, as well as buttons for pause, play and go to the next audio track. But I did not install these buttons.

In the next video, I will test the speaker using an external power supply instead of a battery.

Step 3: Making the speaker housing

I initially wanted to make the body out of wood because it provides excellent sound quality.

But later I decided to place the device in a PVC case. For this I took a T-profile with a diameter of 50 mm. It was easier for me to make such a case, and it turned out to be quite original, moreover, compact and with good sound.

The word Bluetooth refers to the technology for transmitting data over a radio channel to a short distance several meters, for connecting mobile phones, computers and other digital devices. The Bluetooth interface is characterized by low energy consumption and low cost. Currently used most often for communications between cell phones and wireless headsets. The Bluetooth radio interface was intended for transmitting data and voice messages.

In the traditional headset version, the Bluetooth module has a chip, a small 3.7V 50mA lithium-ion battery, a microphone, a speaker and a 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 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, free from interference.

Discuss the article BLUETOOTH DEVICE DIAGRAM

DIY Bluetooth speaker? Yes, now I’ll tell you the easiest way to make Bluetooth equipment, which is quite popular nowadays, from your old home speakers.

Bluetooth speaker, how things are going

With the advent of Apple technology, I began to become quite interested in the technologies that are implemented in these devices, one of such technologies was AirPlay. The technology allowed you to stream audio and video to another device from your iPhone, iPad. The data was transmitted via Wi-Fi, which made it possible to maintain quality during transmission over the air. But there was one problem, this problem of all Apple devices - the price. Such speakers had a price of $300 and above, which discouraged the desire to purchase such a device, because the size of the speaker itself was quite small.

Later I thought that I have speakers at home, why should I overpay for new ones? I only need a device that will receive the AirPlay signal. After searching on the Internet, I realized that it would not be possible to “screw on” AirPlay, but it is possible to use Bluetooth and it will be much cheaper. First of all, I went to Chinese online stores, where I searched. Since I often ordered goods from AliExpress, this device was ordered from there.

The device does not have a brand, name or any other designations, but when connected it calls itself “BT310REV”.

Appearance.

As you can see in the photo below, the device is quite compact and will not get in the way in the car. Due to the fact that the kit includes an adapter, you can immediately insert one end of the adapter into the car radio, and the other end into the Bluetooth receiver. You can do the same with columns. Here you have a “DIY Bluetooth speaker”. The receiver is made of Soft-touch plastic in matte black color. This is an ideal option for this device; it is not noticeable, but at the same time it does not look disgusting.

Sound.

The sound of this receiver is 3.5 out of 5. Bluetooth version old, because of this the transmission speed is lower than it could be. Compared to a cable connection, the sound is quiet and there is noise, but if you turn it on on cheap speakers or simple tweeters in the car, I think you won’t notice any difference.

Device specifications:

• Transmitter version: v3+EDR, Class 2 (Support A2DP V1.2 (built in Mic).
• Power: charging from USB 5V DC.
• Data transfer rate: 3 Mbps.
• Transmission distance: up to 5 meters. Also catches behind a concrete wall.
• There is a microphone.
• Battery 220mAh. As stated, enough for 8 hours of work.
• Works with all iOS and Android smartphones.

Scope of delivery:

• bluetooth transmitter
• 3.5 mm stereo adapter
• Micro USB charging cord
• User manual in English

Using a Bluetooth receiver.

1. First, connect the receiver to your speakers.
2. Press the only button on it. Hold this for 3-4 seconds, after which you will hear a woman’s voice in the speakers and the blue indicator will light up.
3. Turn on Bluetooth on your device and connect to the receiver. Its name is "BT310REV".
4. Everything connected to the iPa without any problems, music played from any application in the system. The device's charge was also displayed in the status bar.

To turn off the receiver, hold down the button until the blue indicator goes out.

Personal opinion on this device.

The device is definitely needed and I really liked it. The appearance is attractive. The sound, although not perfect, is still better than it could be. Don't think that now I'm only praising the device. In fact, it is Chinese, with all that it implies. Large quantity defective and, as you may have guessed, I also came across a defective copy.

How it happened: About 3 times I connected the receiver to different speakers and it worked, but the connection lasted no more than 5 minutes, everything was fine. I was just glad. But one evening I decided to test the device and connected it to for a long time. He played for about 45 minutes and then the problems started. The signal began to be interrupted more and more often, and the hiccups of the music were heard. It felt like he simply didn’t have time to receive the signal, he was already receiving a new one and missing the previous one. This lasted 2-3 minutes, during which time I tried to stop the music, the receiver played again for a couple of seconds, but again began to interrupt. Those 2-3 minutes passed and all hell broke loose, an eerie squeaking sound mixed with ultrasound came from the speakers. The Bluetooth receiver did not reboot, I had to wait until the battery ran out. After completely discharging, the device worked for a couple of minutes and when I tried to turn it on again, it did not turn on again. On at the moment it was not possible to restore it.

But despite this, DIY Bluetooth speaker is ready, purchase devices of this type and use them!