There is a flood of Bluetooth speakers in the market, both small size which one can carry in the pocket and other large ones used in the party halls.
They are very easy to connect with PC or Smartphone via Bluetooth, or many provides USB drive interface so that you can put a drive with all Songs you want to play.
Recently, did a teardown of Boat Stone 620 Bluetooth Speaker (12W) to know which is the electronics behind such consumer electronic products.
I have another speaker from MI, will be sharing teardown of MI Bluetooth speaker in the upcoming blog.
Here is what I got to know.
There are several buttons for user control. Power button to make it ON/OFF, + – to increase or decrease volume and another one for MIC mute/unmute.
On the right side, USB A connector is provided so that user can connect pen drive to play their favorite songs collection. USB C for fast charging. Audio Aux output is also provided to connect external speaker system.
Once you open this plastic plate by unscrewing, you see a PCB vertically placed in the slots.
Components are mounted on both sides, one side two connector for speaker, one connect for the 3.7V lithium battery, USB and Aux connector and buttons.
You can see this side of the PCB, all the ICs and USB C connector.
There are mainly 4 ICs, one is Bluetooth controller which is the main MCU for user interface, audio processing and Bluetooth connectivity.
Actions Semi AT2853 is the Bluetooth Audio SoC used in this Bluetooth speaker.
Other than AT2853 SoC, external Stereo Amplifier CHIPSTAR CS83785E is used.
5V input DC DC based battery charger circuit is used to charge 3.7V single cell battery.
Battery charger IC used is Chipstar CS5305E
Another DC DC Converter Circuit is used for converting battery voltage to constant 5V for circuit operation.
Other part of this device is speaker and battery which is secured in the a sperate compartment. You can see all the details in the images below.
I hope you found this teardown useful and learned something new today!
If you have any questions please ask in the comments section below, I will try to respond as soon as possible.
I am currently working as an embedded systems design consultant and helping companies build custom embedded products, develop test automation solution for their PCB or complete product.
If you have any feedback about the blog, you can share in the comments below or you can also contact me directly.
Read more interesting articles on Embedded Systems Design.