The Bluetooth speaker in this session electronics project has additional 3D sound features and class D amplifiers that are power efficient.
the class D amplifier on this project is a 2x15 Watt (on 4 ohm speakers) PAM8610 amplifier module with a red version color of the board module and have a potentiometer (volume control). speakers using 2 pieces of LG full range speakers (3 inch 4 ohm 50 Watt).
The PAM8610 amplifier module initially used a small red LED which I then replaced with a 5mm blue LED. The following is a photo of the amplifier module:
for the 3D sound module that I use is a DIY module, a module based on IC PT2387. the installation is after the audio output from the Bluetooth audio receiver, then the output from the 3D sound module is fed to the amplifier.
The power supply uses 3S Li-Ion 18650 battery pack (total voltage around 12.3 Volts) with BMS, the output can be directly fed to the PAM8610 amplifier module.
to supply a Bluetooth audio receiver and a 3D sound module, a voltage of 5 volts is required, for that an additional DC-DC step-down module is needed, this module is used to reduce the voltage from the 3S output to 5V. The 5 Volt output is then distributed to the Bluetooth audio receiver module and the 3D sound module.
for a complete circuit diagram and the following process of making the
Bluetooth speaker box, please look at the
YouTube video on my channel (Xpandro) by clicking on the image below:
This Bluetooth speaker body box is made with 6mm thick MDF board. I use sheets of MDF board size 42x30 cm A3, this is so that it is easily broken down into several parts of the body. The body is finished using PVC sticker wallpaper (wood grain) and black acrylic spray paint. speaker box that has been finished have size 42 cm x 18.5 cm x 12 cm.