Igor Kromin |   Consultant. Coder. Blogger. Tinkerer. Gamer.

When I did a teardown of the HBQ-i7 TWS headphones I was not hugely impressed with their quality or comfort. At the end of that teardown I had a near-useless pair of bluetooth headphones left however...so what was I to do? I decided to see if I could make something perhaps even more useless out of them - a poor quality Stereo Bluetooth Receiver.

There was no real purpose to this project apart from seeing whether these two separate headphones could function as one. I was originally intending to re-house them into a custom built case but never got around to it. I did however got the concept working.

The end result was this Frankenstein's monster...
DSC03440.JPG


Before starting with any kind of custom PCB design I thought I'd try out my idea with a breadboard. This meant hooking up some jumper wires to the switches on the wireless headphones. I also needed to test if there was going to be stereo sound so I took apart a cheap pair of wired stereo headphones and hooked them up to jumper wires too.

DSC03196.JPG DSC03197.JPG


I hooked everything up - one common switch and the audio wires hooked up to the stereo wired headphones.
DSC03198.JPG


It actually worked! The single switch was able to operate both of the wireless headphone circuits and have them sync. This was encouraging so I put together a very simple circuit and sent it off to PCBWay for fabrication.



The circuit had nothing interesting about it really. It used an a micro USB receptacle for power (con-molex-usb 47589-0001), a momentary switch (switch-omron B3F-1000), and a stereo socket (con-lumberg KLBR4). Everything else were just pads and through-PCB holes. I put in a bunch of extra test pads in case I wanted to experiment later, these didn't end up being used.
circuit.png


A couple of weeks later my PCB arrived and all the parts were ready for soldering...
DSC03420.JPG


Some progress photos...

DSC03427.JPG DSC03430.JPG

DSC03431.JPG DSC03434.JPG



Making sure that I was getting 5V on the correct pins before soldering everything else (power and audio connections) in place.
DSC03435.JPG


Transplanting from the breadboard to the PCB was trivial and not long after I had both receivers charging, as expected.

DSC03437.JPG DSC03444.JPG


So at this point I was able to charge both of the receivers. When the microswitch was pushed down, both of the receivers activated and connected to one another and my iPhone, as expected. There were minor sync issues from time to time though - some of the time only one of the receivers would activate - I put this down to low battery charge.

So where to from here? Nowhere really! I don't plan to do anything further on this project but it was a fun experiment nonetheless!

-i

Skip down to comments...
Hope you found this post useful...

...so please read on! I love writing articles that provide beneficial information, tips and examples to my readers. All information on my blog is provided free of charge and I encourage you to share it as you wish. There is a small favour I ask in return however - engage in comments below, provide feedback, and if you see mistakes let me know.

If you want to show additional support and help me pay for web hosting and domain name registration, donations, no matter how small, are always welcome!

Use of any information contained in this blog post/article is subject to this disclaimer.
 
comments powered by Disqus
Other posts you may like...