How to make your own bluetooth speaker with a flash drive. Simple DIY Bluetooth speaker (KIT kit). Personal opinion on this device
Greetings DIYers! These instructions will allow you to make a simple Bluetooth speaker. Of course, today it is not difficult to buy such equipment, but if you do it yourself, it will be cheaper, and besides, you will gain experience working with electronics, which cannot be bought for any money. Our author’s speaker turned out to be quite powerful for its size; it used two 3-watt speakers. The device is powered by a built-in lithium battery, which is charged via USB. All necessary components can be ordered for pennies from China.
The author decided to use a piece of PVC pipe and two plugs for it as the body. Holes are drilled in the plugs and the speakers are glued in. The only bewilderment that the design caused me was the closed system inside the case. When the speakers work, the membrane will move back and forth. In this case, either a vacuum will occur in the housing, or the pressure will increase. These factors can muffle the sound and reduce its quality. To solve this problem, there must be holes in the housing, which will equalize the pressure. But it's up to you to think, it's up to you. In the meantime, we are starting to manufacture!
Materials and tools used
List of materials:
- a piece of PVC pipe and two plugs;
- bluetooth module();
- (TP4056);
- lithium battery;
- two speakers 3V each or others as desired;
- switch;
- wires;
- heat shrinkage;
- (amplifier);
- glue for PVC.
List of tools:
- soldering iron;
- hacksaw for metal;
- marker;
- ruler;
- glue gun;
- a drill with a 35mm bit (to drill holes for the speakers).
Column manufacturing process:
Step one. Connecting the charge controller to the battery
To conveniently recharge the battery when needed, we need a small TP4056 controller. We solder 4 wires to the battery contacts, two of them are used to connect the charging board. Observe polarity. Insulate the soldering areas with heat shrink. Try connecting the charger after this, the LED of the corresponding color should light up.
As for the second two wires, at their ends there is a “socket” for connecting the Bluetooth module.
Step two. Connect the amplifier to the bluetooth module
At this step, take the Power Amplifier and connect it to the Bluetooth module, like the author in the photo. That is, in accordance with the markings, we connect the +5V contacts, as well as GND (ground).
Next, you have to solder two wires to the speaker outputs of the Bluetooth controller. We solder their other ends to the corresponding contacts “L” and “R” on the amplifier. Well, we solder 4 more wires to the amplifier to connect the speakers.
Finally, solder the power cable, speakers and try to turn on the device. Turn on bluetooth on your smartphone and look for devices. The author identified the device as WIN-668. If the music is played, everything is fine, now you need to stuff all this beauty into the case.
Step three. We make the case and assemble the column
For the body, take a piece of PVC pipe of the required length and two plugs. Using a drill, we cut out holes in the pipe for the switch, as well as the charging socket. We fix the socket using hot glue, like all electronics. We don’t skimp on glue, everything must be fixed securely.
It's time to install the speakers. To do this, you will need a drill press or drill, as well as a suitable size bit. Drill holes and install speakers. The author fixes them with hot glue. Finally, we solder the wires to the speakers and install the plugs in their places, it is advisable to glue them. The column is ready, you can test it!
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. Three rechargeable 18650 lithium-ion batteries are installed inside the case.
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 housing 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 the 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.
Drill holes in the corners for RGB LED ov.
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
We disassemble the housing of the Bluetooth module. We solder the two wires that went to the headphones and the plug, and then solder 4 separate ones to 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. On top panel install the Bluetooth module.
We install the panels in place. 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 others digital devices. The Bluetooth interface is characterized by low 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 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 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
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 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 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 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 a 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
On back panel passive membranes are glued, 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 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 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 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 the additional functions of the 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 sound signal to high and low frequencies for tweeters and low-frequency speakers, 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 be impossible. 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
Recently, more and more often you can meet people who listen to music not with headphones, but thanks to using Bluetooth columns. This portable device is a case 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;
- 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 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 battery life of the speaker. 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 case of non-removable batteries everything is simpler - there the contacts go straight from the body, 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.
- 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”.
- 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.
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:
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:
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, homemade portable speaker will cost the owner 7-8 dollars, which is significantly less than the prices for 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; moreover, all connection points are marked accordingly on the boards.
