Do-it-yourself bluetooth speaker: diagram and description of the portable speaker assembly

Wireless devices have several advantages over conventional devices. 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 simple instructions for making a Bluetooth speaker at home with your own hands will come to the rescue.

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

What will be needed for work

Details

• For a full sound device will need speakers. In total, they should be taken 4: two for low frequencies, two for the upper ones.

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

• Crossover with two channels (2 pcs.).
• Two passive membranes.
• Battery.
• Charging.
• Amplifier.
• Bluetooth module.
• Boost Converter.
• Power connector.
• Toggle switch.
• Material for the body.

REFERENCE! The best material for assembling the case will be plywood, as it is easy to get and easy to process.

Materials and Tools

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

• Glue.
• Hacksaw, jigsaw and other tools for working with plywood or any material that serves as a housing for the device.
• Marker, pencil and other objects for marking.
• Ruler

Assembly diagram

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

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

Between the supply voltage and the boost module, you should also place a protection board, which provides the device with protection against short circuits.

A simple way to make bluetooth speakers

First of all, for the manufacture of such a device you will need body. The best solution is to make it from plywood.

Important! When choosing the dimensions of the case, one must take into account that it must contain not only the entire electronic filling, 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 designed for woofers. Smaller holes are needed for tweeters. Devices should be placed in pairs, a pair of bass and treble left and right.

Passive membranes as well as charging connectors and a power toggle switch should be located on the rear panel.

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

The side panels must be airtight and processed, as a violation of their integrity will lead to a deterioration in sound quality in general and the appearance of unwanted vibrations of the case.

On the rear panel, as mentioned earlier, passive membranes are located, which significantly increase the depth of the bass. They are not electronic devices and do not require inclusion in the circuit. Membranes are attached to the body with helium super-glue.

REFERENCE! In order to reduce the body's own vibration, a pair of MDF strips should be glued. This will prevent unwanted sounds caused by panel wobble.

Assembly

After all the components of the housing are ready, you should proceed to the assembly of electronic components.

Nutrition

Start with nutrition. If the voltage will be supplied from the 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 elements of the battery is the same. Otherwise, the device will work for a very short time.

Along with the protection board, you must also connect the power toggle switch. When connecting the latter, the polarity must be observed, otherwise the device will fail. In order to check this, 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, 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 on / off, as well as pairing and settings at any time.

The Bluetooth module, in turn, should be connected to the amplifier through an up-stage.

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

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

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

Options for portable bluetooth speakers that you can do yourself

There are many variations of the assembly of Bluetooth speakers. You can use not four, but two identical speakers, which will be fed the same sound. Such a device will have smaller dimensions, but the sound quality will be slightly worse.

There are also build variations with two speakers for high frequencies and one large subwoofer.

Powerful or not the column will turn out, depends on its components.

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

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

• First of all, the battery must be placed in the housing. Connect a charge module to it, which is equipped with two LEDs that signal the charging process.
• The Bluetooth module and amplifier stage should also be connected to the battery. An element for providing wireless communication needs to be connected via a power toggle switch.
• From the Bluetooth component, the signal will be sent to the speaker through the amplifier. On the module itself there are corresponding outputs that must be connected, observing the polarity.

Useful Tips

When assembling, you should consider several basic tips.

• Do not forget about grounding.
• Must be observed polarity. Otherwise, the device will fail.
• Wiresthat connect the elements should be done as short as possible, and they should not intersect each other.
• The case must be tightas they can vibrate if there are unintended holes, creating an unpleasant sound.
• All basic elements should be easily accessible.
• Components should be securely gluedto avoid shipping damage.
• To avoid short circuit, inAll items should be checked for polarity when connected.
• The main elements that are responsible for adjustment and configuration (Bluetooth-module, power toggle switches, amplifier with gain control) should be placed so that their parameters are controlled comfortable. You must also consider the possibility of replacing one of the components without having to disassemble the entire device.