DIY bluetooth audio module. Bluetooth audio module BK8000L

Bluetooth receivers are equipped with RAS audio outputs. The list of reproduced frequencies depends on the manufacturer. Transmitters are typically used with diode expanders. Their range is on average 80 meters. The receiver overload indicator is around 40 A. The voltage is transmitted to the device through compact adapters.

The models are very sensitive to high humidity, and this must be taken into account when using receivers. The average intermediate frequency is 500 MHz. Also important device parameters include the modulation coefficient, which is measured as a percentage. To understand this issue in detail, you must first determine the functions of the devices.

Purpose of devices

Wireless receivers are designed to transmit audio signals. This process is carried out by data modulation. Adapters for models can be used with protection. Many devices are compatible with smartphone operating systems. Modifications with PA output are suitable for music centers.

Wireless receivers are also used to connect set-top boxes. Many modifications are made with coded capacitors. Such models are not afraid of frequency interference and cope well with overloads that occur on channels. Only devices with dipole adapters are suitable for connecting satellite antennas. As a rule, they use a built-in module.

Characteristics of Logitech K10 receivers

This wireless bluetooth receiver is great for connecting second generation set-top boxes. If you believe customers, malfunctions in the adapter are quite rare. The frequency interference protection system is of the third class. There is no video output from the SA in this case. If necessary, the specified receiver can be flashed.

The frequency of the model is 500 MHz. Sensitivity at low load is quite high. The modification's antenna is of the built-in type. It is also important to note that the model has very compact dimensions. The receiver is produced mainly in black color. Audio output KKR in this case is available. Thus, the model copes well with high frequencies.

A diode type expander is used to transmit the signal to the connector. The model does not have an indication system. The receiver's audio output, P20, deserves special attention. The model can be stored at a temperature of no more than 50 degrees. The specified bluetooth receiver costs only 5,800 rubles in stores.

Model Grand-X BT45G

This Bluetooth AV receiver is great for connecting satellite dishes. According to customers, the device works without failures. The modification's transmitter is used with contact extenders. This device is not afraid of sinusoidal interference. from switches are also rarely observed. The intermediate frequency indicator is at around 340 MHz.

The device is not suitable for first generation consoles. It is also worth noting that the model is produced without a built-in antenna. The receiver should not be used in areas of high humidity. The maximum data transmission distance is 80 meters. The demodulation coefficient is at around 75%. The receiver overload parameter is no more than 40 A. There is no RK audio output in this case. The price for the specified Bluetooth receiver starts from 4800 rubles.

Features of Grand-X BT53G devices

This bluetooth transmitter is perfect for set-top boxes and stereo systems. Many people praise it for its compatibility with the Android system. It is also worth noting that the expander of the modification is of the collector type, and protection against sinusoidal interference is provided in this case. Unfortunately, the PCA model does not have a video output. The maximum voltage of the receiver is 5.5 V. The model is capable of transmitting data over a distance of 80 meters.

The antenna is used by the manufacturer as a retractable type. When transmitting a video signal, the capacitor reacts very quickly, with an average response time of 1 ms. At a frequency of 300 Hz, the model behaves stably, and there are practically no harmonic oscillations. When purchasing a model, it is important to consider that CAC formats are not supported by the device. It is not suitable for connecting switches. The price for this Bluetooth receiver in stores starts from 7 thousand rubles.

Characteristics of receivers Cliptec CL-BLU-ZB626

This is an inexpensive and multifunctional Bluetooth transmitter. Buyers praise it for its quick response and the presence of the RK port. The device supports the PAC format without problems. The harmonic vibration protection system is of the third class. The device transmits data over a distance of no more than 100 meters.

The body of the receiver is made compact. It is better not to use the device in hot weather. The intermediate modification frequency is 600 MHz. An AV receiver with bluetooth costs from 5 thousand rubles in specialized stores.

Customers' opinions on Sony C30101 models

This model has the following parameters: intermediate frequency 340 MHz, overload 30 A, operating humidity 30%. According to buyers, the receiver can be used with a connector. The protection system against sinusoidal interference is of the third class. In this case, the antenna is of the built-in type. The expander of the modification is used with two contacts. The device supports low frequency channels without problems. The demodulation coefficient is at 80%.

The range of the receiver in this series is not very high. However, it is important to note that it has a high-quality adapter with a capacitor installed. The conductivity of the diode is at least 5 microns. There shouldn't be any problems with the RK format. In stores, the user can buy this receiver for 5,800 rubles.

Features of Belkin devices

This receiver is well suited for music centers with a PP output. If you believe the experts, the adapter chosen for it is of quite high quality. The expander in the device is of a single-channel type. There is no PAC output in this case. It is also worth noting that the model has a high sensitivity parameter. The receiver overload rating is only 30 A.

In this case, there is no protection system against magnetic vibrations. The unit voltage is no more than 5.4 V. The modification copes well with overloads from the adapter. The bluetooth music series costs approximately 5,700 rubles.

Characteristics of Yamaha 1010 receivers

This Bluetooth speaker receiver is famous for its high-quality capacitor. According to buyers, the model can be connected to set-top boxes. The data transmission range is no more than 80 meters. The modification's antenna is of a built-in type, and it is installed in the upper part of the structure. The intermediate frequency of the device is 520 MHz.

The magnetic vibration protection system is of the third class. The modification has only one RAS audio output. It is permitted to connect wired connectors to the model. However, it is important to note that the device body does not tolerate high humidity. The demodulation coefficient is no more than 90%. In this case there is a video output from the spacecraft. The price for this bluetooth music receiver fluctuates around 7,700 rubles.

Customers' opinions about Gemix BT-12 models

This Bluetooth receiver (audio bridge) for set-top boxes is in great demand. First of all, it is important to mention the high sensitivity of the device. The receiver has an RC output. The device copes well with magnetic vibrations. However, there are also disadvantages. The receiver's throughput capacity is significantly reduced. The device is not suitable for first generation consoles.

If you believe the reviews of experts, the model supports the RCC format. The equipment overload indicator is at 33 A. The harmonic interference protection system is of the third class. This model supports Android smartphones. However, it is important to note that the manufacturer does not provide compatibility with the KR20 format. When transmitting multi-stream data, long delays occur. The model is not cheap, and in the store it is sold for 8,200 rubles.

Features of Gemix BT-30 devices

This Bluetooth headphone receiver has many advantages. Buyers praise the device for its simplicity. This modification supports the standard functions of the adapter. To connect a music center, the PA output is used.

It is also worth noting that the model supports the P30 format. Problems with harmonic vibrations are quite rare. The device cannot be used to connect set-top boxes. The magnetic vibration protection system is of the third class. The intermediate frequency of the modification is at around 380 MHz. If you trust the reviews of experts, then the modulation process for this receiver does not take much time. Transient processes in the expander do not take much time, and the response rate is no more than

The model supports the PK40 format. Connectors can be connected of various types. It is also important to mention a high-quality retractable antenna, which copes well with signal reception. The modification's capacitor is of the dipole type. The price for this device in stores starts from 6,400 rubles.

Characteristics of BM10 receivers

The BM10 Bluetooth receiver has the following indicators: nominal voltage 3.5 A, demodulation coefficient 68%, input sensitivity 10 mV. Overloads in the device are allowed up to 20 A. The receiver does not have a protection system against harmonic vibrations. It is especially important to note that the model has a dipole-type adapter installed.

The expander for it is matched with two filters. Thus, the range of the device is high, as much as 120 meters. The receiver body is made of plastic. The modification's antenna is of the built-in type. The intermediate frequency of the device is 380 MHz. The PA output in this case is supported by the equipment. Receivers cost approximately 8,800 rubles in markets.

It happens that the computer's acoustic system (speakers) needs to be placed at some distance. In this case, of course, the simplest solution would be to take a longer cable and connect it using it. But if you don’t want to clutter the room with unnecessary wires, then you can do this using a bluetooth audio module based on the bk8000l chip.

This module is a small board on which the chip itself and its wiring are soldered, and on the edges of which there are contacts for connecting external devices. Of course, using this module in speakers is not the only purpose of the BK8000L audio module. It is possible to connect microphone control keys to it and turn, say, old wired headphones into full-fledged wireless ones. The module also has a UART interface for its configuration, but unfortunately it is disabled in software (at least in the modules that I came across). Therefore, renaming the module and putting a PIN code on it will not work.

The positive power supply is supplied to pin 29 of Vbat, and the negative power supply is supplied to all pins marked GND. Please note that the module controls power supply and is designed to operate from a lithium-ion battery. That is, the supply voltage should be no higher than 4.2 Volts and no lower than 3.2 Volts. Once power is applied, the module is ready for detection. In my case, the power supply was 3.3 Volts from an AMS1117 type stabilizer.

There are additional adapter boards for this module for ease of installation, but since I only needed audio outputs, I decided to solder it with thin wires on a breadboard.

If everything is clear with the connection of buttons, LEDs, microphone, then there is a small nuance with the output. The fact is that in order to connect speakers that have a built-in amplifier, we need three wires: left-right channel and ground. The BK8000L module is designed to work with headphones, and each ear must be connected to its own two pads on the board. These are AUDIO_RN, AUDIO_RP, AUDIO_LP, AUDIO_LN, i.e. right minus, right plus, left plus and left minus. Having connected the oscilloscope, I saw that the signals were moving relative to each other and were shifted in phase by 180 degrees.

This is done for greater output swing. Since I have an amplifier in my speakers and I don’t need drive, I simply connect: the right channel to AUDIO_RP, the left channel to AUDIO_LP (through 0.47-2.2 uF feed-through capacitors), ground to the ground of the GND board. I leave the other two pins unconnected.

The entire structure was built into the speaker body, the power was taken from the power supply of its amplifier. Works very well.

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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 is suitable only for those who are 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 the necessary elements to the finished circuit with their own hands. 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 disparate radio components.

Homemade Bluetooth receiver. DIY universal bluetooth receiver from an old bluetooth headset for a 3.5mm jack audio connector.

I think it’s no secret to anyone how a bluetooth headset works.
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.

For production we will need:

1. Bluetooth headset;
2. Audio connector 3.5mm jack;
3. A pair of wires;
4. Heat shrink;
5. Super glue.

From the tools:

1. Soldering iron.

Making a Bluetooth receiver

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.

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

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

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

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

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

As an UMZCH I used a stereo ULF of 20 watts per channel, which costs $20 on ebay. You need to disassemble it and inspect the inside of the case to understand where to get the power from the module and where to actually place it. When everything is unscrewed, the amplifier looks like this.

Now about the bluetooth audio transmitter. It is bought ready-made.

All together - adapter and stabilizer - costs less than $8.

An disassembled Bluetooth audio receiver is shown in the photo. Connect 3 wires to the audio jack.

Now solder the wires from the USB cigarette lighter - charger.

They are both designed for power supply from 12 V. If the amplifier operates even from 24 V, it is still suitable. But if the amplifier operates at a higher voltage or is powered directly from a 220 V network, you will have to take a USB charger separately, or look for a lower, stabilized power supply on the board of the UMZCH itself. In general, you will figure this out yourself.

Now connect it to the bluetooth receiver according to the power supply on the board - this is 5 volts. Both modules are attached to an aluminum radiator, as the most massive element of the circuit.

The input wires are directly soldered to the audio out line of the amplifier, but if you want to add an active subwoofer or connect something similar, you need to drill a separate 3.5 mm output in the rear panel. Carefully secure the Bluetooth receiver itself to a suitable place using hot glue.

And here is the final view of the UMZCH, with an additional audio output that receives a signal from the Bluetooth channel.

Thus, for just 400 rubles it is absolutely possible to make it wireless, that is, receiving an input signal via a radio channel from a smartphone or other Bluetooth-equipped device.