How to make a bluetooth speaker at home. How to make wireless speakers with your own hands. DIY Bluetooth speaker. Final assembly of the body of a homemade Bluetooth speaker
Everyone brainiacs greetings! 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 control 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. Big time works 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 needed:
- 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 fast way creating panels is laser cutting, and My laser cutter I couldn’t cope with plywood thicker than 3mm, so for greater strength, I made the front panel from two glued parts, which was additionally reinforced with strips of MDF. I note that everything wooden parts in that 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 panels of your own design... then I would still recommend making a hole for quick access to the electronics 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 less quality plywood it splits or even falls 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 internal contour, the part is cut out from plywood sheet along the outer contour.
Step 4: Gluing the Side Panels
The side panels are simply glued together with wood glue, big amount 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 dry, then use a jigsaw or circular table the protruding parts are ground off 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 the frequency range of the 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 this case it is better with gel super glue, since it is not so rigid 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. 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 those electronics, it's important to find correct position each component, and make sure that everything “fits” as required! 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 list of parts, then assembling an electrical circuit is quite simple, you only need a soldering iron and solder (well, cable ties to make things neater). 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, excessive discharge, short circuit and much more. Accurate protective functions slightly different for different boards. Such protection boards are mandatory element, because lithium-ion batteries are very sensitive and require special conditions for their operation, and without 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 Internet are sold as chargers, but in reality they are regular blocks power supply, so when choosing and ordering 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 has all batteries same value, since otherwise it 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 in this way, then leave enough free space between the amplifier and Bluetooth module chips, since both chips require air flow for cooling, and a short circuit may occur if they come into contact. 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 functions 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, which will separate the sound signal into high and low frequencies for the 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 sidebar, and to do this, wood glue is applied to the back panel along the edges and it is pressed against the side. 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 having received positive results, the 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 learn more ideas. And of course, if you are interested in this topic, you can find me on various
In this article you will learn how to assemble an inexpensive wireless speaker with which you can listen to music from a smartphone, tablet or computer. The signal will be transmitted via Bluetooth.
Required components:
Small speaker with up to 3W power
- Board with Bluetooth module
- Smartphone battery or 18650 battery
- Amplifier with 8002B chip
- Buttons for switching music (3 pieces)
- Switch
- Micro USB port for charging
- Wires
- A box or round plastic jar (for example, cosmetics)
First prepare the body. If using a jar, cut a hole in the lid for the speaker or make many small holes in the lid. Secure the speaker with bolts or glue.
Solder wires to the pins on the Bluetooth board that lead to the power, speaker, switch, and switches. These contacts are marked on the board or indicated in the instructions for it. The wires going to the speaker should be longer than the others as they will get twisted if the jar has a screw cap.
Make holes on the case for the power port and switches. Solder the components to the wires and attach them to the case using hot glue. Also fix the board and battery with glue inside the case so that they do not dangle.
Charge the speaker using the USB adapter and check the functionality of the speaker. If everything is done correctly, it will connect to the smartphone and output sound. If desired, the jar can be painted with spray paint so that it is difficult to guess that it is a homemade gadget.
To prevent the body from slipping, you can attach legs or rubberized material to its lower part.
If you have broken Bluetooth headphones lying around, you can use them to make such a portable Bluetooth speaker.
The device is powered by a TDA7297 amplifier with a power of 15 W with a 10-W speaker and has an aux connector. There are four LEDs on the front of the speaker that change color depending on the rhythm of the music. Inside the case there are three rechargeable lithium ion battery 18650.
How to make a bluetooth speaker with your own hands - components and tools
Before you begin assembly, you need to prepare the parts. So, to install a Bluetooth speaker with your own hands you will need:
- Speaker 10 W.
- Amplifier TDA7297.
- Bluetooth headphones.
- Arduino nano.
- Li-ion batteries 18650 - 3 pcs.
- RGB LEDs - 4 pcs.
- Switch.
- Toggle switch 2-position 6-pin.
- Headphone jack.
- Potentiometer 10 kOhm - 2 pcs.
- Diode IN4007.
- Fasteners
- Colored wires.
- Pins.
- Connectors.
- Soldering iron.
- Solder.
- Super glue.
- Hacksaw.
- Wire cutters.
- Pliers.
- Screwdriver.
- Dremel.
- Dye.
- Brush.
- Pencil.
- Sandpaper.
- Ruler.
- Heat shrink.
- Lighter.
- Glue gun.
How to assemble a case for a portable Bluetooth speaker with your own hands?
First of all, we cut out 6 panels from chipboard:
- 12x12 cm - 2 pcs.;
- 12x9.5 cm - 2 pcs.;
- 11x9.5 cm - 2 pcs.
- See also how to do
Drill holes to mount the speaker.
We grind the cuts on the hole.
Sand all edges with sandpaper.
The back panel of the box must be removable, so we make tenons on it, and grooves on the adjacent panels.
This is what the back panel will look like.
And here are the side ones:
We assemble three sides of the body.
How to assemble a Bluetooth speaker with your own hands - installation of the “filling”
We screw the speaker.
We install the switch, toggle switch and potentiometers.
We drill holes in the corners for RGB LEDs.
Amplifier board for bluetooth speakers
We solder the wires to the board according to color, as in the photo.
Installing a Bluetooth module for a speaker
Let's disassemble the Bluetooth module housing. We solder the two wires that went to the headphones and the plug, and then solder 4 separate ones in the same places.
- Scheme
Arduino board for Bluetooth speaker
For the project we will use the following contacts: Vcc, Gnd, 5v, A0, A1, D9, D10 and D11. We install pin connectors on the Arduino board. We solder the wires to them.
Installing RGB LEDs in a portable Blurtooth speaker
A single RGB LED is distinguished by the fact that three LEDs are combined in one housing - red, green and blue. Accordingly, they have four legs, one is a common cathode, three are anodes.
- Step-by-step instructions for making your own
We install the LEDs in the holes in the corners of the front panel. Fix with hot glue.
DIY Bluetooth speaker: diagram and installation
We install the electrical part according to the diagram. All connections are insulated with heat shrink tubing. We secure the wires inside the housing with hot glue.
Final assembly of the body of a homemade Bluetooth speaker
On the side panel we drill holes for the audio jack. We install the Bluetooth module on the top panel.
We install the panels in place.
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 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 for low frequencies, two for high frequencies.
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! Optimal material For assembling the body there will be plywood, since it is easy to get 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 contain not only the entire electronic stuffing
, 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.
REFERENCE! The rear panel should contain passive membranes, as well as charging connectors and a power switch. 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 a circuit..
REFERENCE! The membranes are attached to the body with helium super glue
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. 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 is to connect the Bluetooth 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. 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! How larger size and the 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.. 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. The 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.
Technological progress is moving forward by leaps and bounds, now even preschoolers have a mobile phone and know how to access the Internet, and seeing a person talking to himself on the street, no one will twirl his finger at his temple - everyone is already familiar with a Bluetooth headset, which is a wireless technology. This transmitter operates using encrypted signals, which, in addition to convenience, allows you to protect personal data. The wireless module allows you to establish communication among several devices.
Bluetooth application
This device is now built into almost all cell phones and many laptop models. This allows you to significantly expand their communication abilities:
- You can exchange various files (photos, videos, music) between phones, phone and laptop, communicator, camera.
- The module allows you to connect any peripheral devices (wireless headsets, headphones, speakers, video cameras and other gadgets) to phones or personal computers.
- Talk on the phone without holding it with your hands.
- You can create a wireless network between several of your PCs and other devices at home or in a small office, allowing you to have constant access to the necessary files from any device.
- The Bluetooth adapter allows you to access the Internet by synchronizing your PC with your mobile phone.
That is, wireless devices are necessary not only for using a hands-free headset, but also facilitate communication between the computer and gadgets.
How to make an internal bluetooth module for a laptop?
For an active person, it may be inconvenient to use an external Bluetooth adapter. Some craftsmen suggest modifying it with your own hands into an internal one by soldering the device to a USB connector. This option will do only for those who are intimately familiar with a soldering iron and have experience in assembling and disassembling laptops.
Work on improving the gadget with your own hands is carried out in several stages:
If everything is done competently, the device should work.
Is it possible to make a wireless module yourself?
Sometimes the question is asked: is it possible to make a transmitter with your own hands? This option is quite difficult to implement. You cannot assemble a microcircuit with your own hands at home, since it is very miniature, requires very delicate work, and the selection of the frequency range is carried out using integrated solutions; the protocol has been developed by specialists for years.
Therefore, radio amateurs can only use ready-made Bluetooth transmitters and modify them at their own discretion, adding them with their own hands ready-made diagram necessary elements. Some suggest upgrading a music speaker with a module or making wireless speakers, as well as adding a transmitter to the car’s audio system to avoid a clutter of wires and download your favorite music directly from the Internet.
The video below shows in detail how to do this. But in any case, such manual work requires good knowledge and skills in radio engineering, otherwise from one working Bluetooth module and additional elements you can get a set of scattered radio components.
