What are you looking to do with your Bluetooth device? No matter how you want your Bluetooth device to function, one thing’s for sure – you would want it to pair up quickly.

You want to listen to your favorite tracks while on your vacation so what do you bring with you? A Bluetooth speaker that can play hours of your playlists.

You want to transfer some cool selfies you have clicked to your friend’s cell phone. How do you do it? You activate Bluetooth connection and transfer the images through the connection.

The magic of Bluetooth is all around us, and all of it is accomplished by the functioning of the Bluetooth circuit board. In this article, we will go in-depth and give you a wholesome course on Bluetooth circuit boards and the different types including its applications.
In the first chapter, we will begin with a brief look at Bluetooth technology and head directly to the circuit board itself.

bluetooth circuit board

1、Bluetooth Circuit Board

You can find the Bluetooth circuit board inside your smartphone, and other Bluetooth enabled devices. However, before we dive into the details of the Bluetooth circuit board let us take a while and discover how Bluetooth technology works.

1.1 The Principles of Bluetooth Technology
Bluetooth is a form of communication which utilizes radio frequency to connect with different devices. It can operate at 2.4 GHz frequency and similar to the different type of wireless communication forms such as the Wi-Fi.

One master Bluetooth device can remotely connect to 7 other Bluetooth enabled devices. The paired devices exchange information serially with the master Bluetooth device. The interaction between the paired devices can be done through the master Bluetooth device which acts as a facilitator.

Bluetooth frequencies have a range of 1 cm to 100 meters, and each connection needs approval from the devices using unique codes. Bluetooth devices can reduce energy consumption by staying in idle mode when there is no active exchange of information.

Bluetooth circuit boards are the main force driving wireless headsets, remote controls, wireless speakers to IoT (Internet of Things) application. They are two layered PCBs but have only a single plate. You will find the layers on both sides of the plates.

1.2 The Principle behind Bluetooth Circuit Boards
The principle behind the working of a Bluetooth circuit board is straightforward. There is an antenna located on the Bluetooth PCB which receives the signal sent out by a Bluetooth device. The signal is then sent to the output after being processed inside the circuit board.

Different Bluetooth profiles are used to facilitate communication between devices based on the application of the Bluetooth device. For example, the Audio/Video Remote Control Profile (AVRCP) is used for communication with audio video devices and found in remote controls of hi-fi equipment and TVs.

1.3 Components of a Bluetooth Circuit Board
A Bluetooth circuit board also contains a minimum of 2 inductors which can fine tune the impedance of the antenna to improve the reception and sending of information. The modules have 4 IO pins which are the State, Enabled, communication and power supply options. You can also find multiple resistors, diodes, and capacitors placed on the Bluetooth circuit board.

Apart from the above components, other parts such as chips, voltage regulators and the crystal-based clock can also be found. The Bluetooth circuit board requires careful attention while assembling especially with the antennae for its proper functioning.

It is what a Bluetooth circuit board looks like

Like we have already said, Bluetooth circuit boards are found within Bluetooth enabled devices. In the next chapter, we are going to explore some of the practical applications of the Bluetooth circuit boards.

bluetooth circuit board

bluetooth circuit board

2、Types of Applications of Bluetooth Circuit Board

Bluetooth boards exist in the devices and devices we use every day without careful consideration. Anything that uses wireless connection can be using Bluetooth radio frequencies even without your knowledge.

So let us go over some typical applications of Bluetooth circuit boards.

2.1 Wireless Headsets and Earphones
Fancy listening to music on the go without the hassle of wires messing up?

Most of the wireless headsets and earphones use the Bluetooth technology for transmission of audio and voice signals. The Bluetooth circuit board is the silent performer enabling the connection between your audio device and your headset making you listen to your favorite songs.
You can also talk over the Bluetooth connection using voice signals courtesy of the Bluetooth PCB.

2.2 Cordless Keyboards and Mouse
An impressive number of wireless keyboards and mouse rely on Bluetooth circuit boards to connect to your computer and help you do your work. Earlier wireless connections were made over infra-red frequency, but Bluetooth is a far more superior alternative used these days.
Even printers, scanners and other computer peripherals can be connected using Bluetooth technology.

2.2.1 Bluetooth Speakers
Bluetooth speakers are a fad these days, and everybody is carrying one. The wireless speakers have an inbuilt Bluetooth circuit board as a part of the main circuit board which is responsible for syncing with your audio player or smartphone.

2.2.2 Multimedia Transfer
We don’t think twice before transferring songs or videos between devices over a Bluetooth connection. All such devices are sending out and receiving multimedia content, and other files are equipped with a Bluetooth circuit board.

The smartphone you are using also has a Bluetooth circuit board which lets it play songs through a wireless speaker or headset and transfer files and movies from one phone to another.

2.2.3 Automatic Synchronization
Bluetooth connection is the spinal cord of any device which has to do with IoT. This new technology creates a bright world by connecting everything and giving you control over it.

For example, you may pick up the temperature of the machines in a factory on your smartphone over a connection established over Bluetooth frequency. Such devices use Bluetooth circuit boards for automatic synchronization and exchange of information between different touch points.

bluetooth circuit board

bluetooth circuit board

3、Bluetooth Module

The best way to integrate Bluetooth functionality into a device is using Bluetooth modules. Use of a Bluetooth module makes the designing job easy and can lower down your certification expenses. It comes with an increased production cost but can be economical when you are dealing with large-scale manufacturing.

You will be able to find a different type of Bluetooth modules in the market. One of the common types is HC 05 Bluetooth Serial Port Protocol (SPP) module which can be used to set up a clear wireless connection.

It supports Bluetooth 2.0 and can carry out the transfer of data at 2.4 GHz with modulation of 3 Mbps. It comes with a single chip Bluetooth system and features CMOS technology with Adaptive Frequency Hopping Feature. It also has a minimal footprint of 12.7 mm x 27 mm.

You can easily extend your serial interface wirelessly using the Bluetooth module. The computer or laptop connected to the module acts as if it is just using one of the serial ports through the exchange is carried out over the wireless Bluetooth link.

bluetooth circuit board

bluetooth circuit board

Generally, Bluetooth modules are pieces of hardware which has the Bluetooth circuit board and enables wireless devices to work with a laptop or computer. Some of them also come with USB connectivity so that you can directly plug them with your computers. You can also purchase Bluetooth modules and connect them with motherboards to connect and broadcast through a Bluetooth frequency.

The Bluetooth technology has different levels of classes which determine the range of the Bluetooth modules. The version number of the model also represents the functionality range such as power consumption and range.

Bluetooth modules can also be found in various Bluetooth enabled devices such as custom speakers and cell phones. It can be used in place of a microcontroller to enable a device to use Bluetooth capabilities.

Now the time has come to take a closer look at different types of Bluetooth circuit boards. We are going to cover Bluetooth speaker circuit boards, Bluetooth transmitter circuit boards, and Bluetooth receiver circuits boards in the following chapters.

4、Bluetooth Speaker Circuit Board

It has become an everyday phenomenon to encounter people playing music on their Bluetooth speakers and chances are that you even own one to play your favorite tracks. Bluetooth speakers work on the same principles of Bluetooth by connecting with your smartphone or audio device to play music.

We are going to take a look at the Bluetooth speaker circuit board which can be found inside the speaker. It is placed on the main circuit board which controls all the functions of the Bluetooth speaker.

You will have to open the speaker to get access to the Bluetooth circuit board. The circuit board contains different segments dedicated to Bluetooth, audio amplification, voltage balancing, and battery charging.

On the backside of the circuit board, you can find the volume adjustments buttons, play control buttons and a microphone to make voice calls. You will also find the speakers, battery and a secondary circuit board which supplies the USB power, power buttons, and the LEDs.

The Bluetooth speaker circuit board is one of the most significant parts of the main circuit board. The Bluetooth circuit board comes with an IC which makes up the Bluetooth system of the board.

The IC can be used for any wireless audio components as is the case with a Bluetooth speaker. You can find the Bluetooth module which can support various functions such as Bluetooth 4.0, line-in audio, wireless stereo audio and so on. The IC can even come with lithium battery chargers or voltage regulators in some cases depending on the purpose.

Bluetooth module paired with EEPROM, having a frequency of 128 Kbit. The EEPROM can use two-wire serial interface to exchange information with the Bluetooth module which stores the settings and information too.

Another significant part of the Bluetooth speaker circuit board is the antennae. Depending on the circuit board, you might find a trace antenna. Data is sent and received using this antenna on the Bluetooth circuit board.

The antenna can feature two inductors such as L4 and L6 which can optimize the performance through fine tuning it.

Now you have got an idea about the Bluetooth speaker circuit boards. Next, we will discuss the components of the Bluetooth transmitter circuit board in the next chapter.

bluetooth circuit board

bluetooth circuit board

5、 Bluetooth Transmitter Circuit Board

Bluetooth is about sending and receiving radio signals between devices. When you are listening to music on your Bluetooth speaker, it is receiving the audio from the phone which comes through the Bluetooth transmitter circuit board.

The Bluetooth transmitter circuit board coverts the sensor data to wireless transmission for your convenience. The board also comes with a recyclable battery and charging system for it to function.

The Bluetooth transmitter circuit board has three significant components- regulated voltage, sensor data, and wireless transmission. The regulated voltage is responsible for supplying power to the sensor circuit, Bluetooth transmitter, and microcontroller. It has to do with the electrical functions only.

The sensor data is the data that flows into the Bluetooth transmitter and can have values of 1,2,3 or 4. It depends on the sensor which is hit and consequently travels to the Bluetooth transmitter.

The last component of wireless transmission is a combination of electrical and programming function. It transmits the Bluetooth protocols through the airwaves to the intended device.

The Bluetooth transmitter is also responsible for establishing connections with other nearby devices. You may find LED indicators on the Bluetooth circuit board which reveals the status of your device. The transmitter can connect to the available devices as soon as they are powered on.

The circuit is engineered in a way that it stays on a standby mode until a signal is delivered to the transmitter. The recyclable battery used in the transmitter should be capable of handling long hours of operation so that there are no interruptions in the service.

Many devices use lithium-ion batteries for the purpose as it can give long hours of operation. A lithium ion battery may be able to last 10 hours on a single charge. There is another small circuit board in the cell which ensures that the battery is not overcharged or over discharged. The circuit also protects the battery from being short-circuited.

The Bluetooth transmitter circuit board contains options for battery charging, voltage regulation, audio amplification, and Bluetooth. The other functions of the speaker are carried out by the different parts of the main circuit board.

The Bluetooth transmitter also comes with play and volume control buttons to give you control over your music.

We have covered the Bluetooth transmitter circuit board in details. Let us now explore the Bluetooth receiver circuit board in our next chapter.

bluetooth circuit board

bluetooth circuit board

6、 Bluetooth Receiver Circuit Board

You can use a Bluetooth receiver to stream signal from a Bluetooth enabled device and transmit to some other device. For example, you can use a Bluetooth receiver to get the signal from your smartphone and connect it to the aux input of your stereo to listen to your favorite tracks.

You will find the Bluetooth receiver circuit box inside the device which controls the functions. It comes with a rechargeable battery which needs to be charged from time to time. Most of the devices use a lithium-ion battery which can perform for more extended hours on a single charge.

The battery can come with its circuit board which ensures that you don’t end up overcharging or over discharging the battery. The circuit also helps to prevent any incidents of the short circuit.

Some circuit boards also have USB charging options for convenience. You will have to use a USB cable for the purpose.

The Bluetooth receiver circuit board will have an antenna which is used to receive the signal from your smartphone or Bluetooth device. The circuit board is similar to the Bluetooth speaker circuit board and comes with an IC which makes up for the Bluetooth system.

You can also find aux output on the circuit board which can be used to hook it up to amplifiers or audio systems. The circuit board also has options for audio amplification and voltage regulation which are required for the proper functioning of the device.

You can easily purchase a Bluetooth receiver from the local shop or use a Bluetooth receiver circuit board to make your receiver. The Bluetooth receiver can also have other components depending on your purpose.

Sometimes it may be used for measurement and can come with accelerometers and sensors to measure humidity and temperature.

bluetooth circuit board

bluetooth circuit board

7、 Conclusion

You have to maintain professional standards while assembling a Bluetooth circuit board otherwise the functionalities, range and other features will suffer. You can get your Bluetooth PCB assembled by us and enjoy the service of a trusted and experienced partner who has been in the business for many years.

You can get in touch with us for high-quality Bluetooth PCBs made according to your strict specifications. We also deal in bulk orders and can provide you a cost-effective mean to grow your business.