I would like to share with you how I managed to provide Bluetooth capability to my relatively old home cinema system.
All the instructions and code are provided "as is", please follow/use them at your own risk, I will not be liable for anything what so ever. Also please let me inform you that I do not have any tie-up with the vendors that I have mentioned below from whom I have acquired, obtained, purchased various software and hardware components, nor do I receive any commission from them. These components carry license agreements from the vendors. Please adhere to their respective license agreements.
Step 1: Requirements
1) One of the main requirements is not to have a rechargeable solution because it becomes annoying when it is required to be charged frequently.
2) I own a relatively older DVD 5.1 home cinema system. This system does not have wireless capability. So I have been thinking to provide it with some form of wireless capability for an example; Bluetooth.
It is important to note here that the system has and is required to have:
a) a female USB port (this interfaces with USB sticks and can play songs from it)
b) a 3.5 mm standard stereo audio input
3) A cheap Bluetooth audio receiver is required that can be interfaced with the above ports i.e. with a male USB and a 3.5mm stereo audio output port and I found such a receiver on some of the popular e-commerce websites for 2-3f.
Step 2: Simple Setup
The main idea here is to supply the necessary power to the receiver from the system's USB port and obtain the audio output from the receiver and provide it to the stereo input of the system.
The USB port of the system accepted USB-sticks and could play songs from it. This means the USB port will try to access the data pins of any USB device plugged to the port. This can create a problem and also hang the system if the USB device is not a storage device such as USB-stick or pen-drive. This is because such older systems with USB capabilities could not access any other non-storage USB devices.
Also, I observed that my system hanged when I plugged the USB Bluetooth audio receiver. To solve this problem, I opened the USB Bluetooth audio receiver to check the USB data signals and I was right in thinking that there were connections made to the Bluetooth chip from the USB data pins.
So as shown in the images, I cut the middle two data tracks from the PCB of the Bluetooth receiver, using just a pen knife. I then plugged the receiver into the system and wallah!. The system has now Bluetooth capability. I was able to play songs directly from my smartphone to the home cinema system.
Step 3: Other Applications
Please note, this solution can be deployed to any such media system for an example your car's audio player and enjoy Bluetooth capability without the hassle of charging.