I use Honeywell Bluetooth Speaker in my office for the conference calls or team meetings.
Recently I took it apart to see what goes inside this device, I have seen MI’s Bluetooth Speaker, Boat’s Bluetooth Speaker, I was actually expecting similar design in here but was surprised to see a very simple yet useful design.
Luckily, I was able to assemble it back without breaking it so I am able continue using it 🙂 Many a times after teardown that is not the case.
Parts of Bluetooth Speaker
On the top of the Bluetooth speaker you will see various buttons.
Previous is move to previous audio file, next is for next audio file, Play/Pause is start playing audio or Pause the currently running audio file.
Mode is to enable/disable Bluetooth mode and the Call button is to take the phone call with a press of a button.
On the back side of the device you will see various ports.
USB-A port is give to connect USB pen drive, microSD Card option is there so that you can play audio files from these memory devices.
MicroUSB connector is given for battery charging. Audio jack is given so that you can connect audio output from the speaker to bigger amplifier.
ON/OFF switch is for power ON/OFF.
Now let us take it apart and see little bit inside 🙂
But, before that, this device is Made in China, not assembled or Made in India.
You can easily open by removing the mess cover with a scew driver.
To open further you need to remove a few screws.
After opening you will be able to see enclosure splits into two parts.
It uses a single cell lithium battery 3.7V @ 2500mAH
It uses two speakers, 4 ohm and 5W rating.
These are the buttons/keys I have shown initially.
This is the complete PCB from one side.
The other side of the PCB has most of the electronics
MIcroUSB connector is provided to charge the battery and LTC/Analog Devices LTH7 / LTC4054 single cell battery charger IC is used.
A Linear regulator used to generate 3.3V to power other circuitry on the board.
Stereo Audio Amplifier Chip is used from Chipstar CS8389E. Its hard to find English datasheet. Also it looks like part is quite old and now no more recommended for new designs.
Main Soc used in the Bluetooth speaker is from Jerry Bluetooth JL AC20bP, I could not find the datasheet but I found the schematic of a similar device, which gives you an idea how the circuit would be.
That is all inside this Bluetooth Speaker, the whole PCB doesn’t look like more than 300-350 Indian Rupees considering everything else total manufacturing cost should be around 500-600 Indian Rupees and ofcourse in this is in high volume like 25-30K min.
I hope you found this teardown useful.
I am currently working as an embedded systems design consultant and helping companies build custom embedded products, develop test automation solution for their PCB.
If you need help in designing a product based on CH32V003, please contact me.
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