Let's Make Robots!

feasibility of DIY wireless headphone kit

So, I was searching the market for what my wireless headphone options were and got quite disappointed.

As it seems, wireless used is either IR, RF (on the FM/UHF band) and Bluetooth (also 2.4Ghz seemingly working in the router's norm).

IR ... needs line of sight, small range...
RF... prone to interferences
Bluetooth... small range
2.4GHz... some reviews said they interfered with the home wireless routers


So given the fact I've already own a few reasonable earphones I thought:

How feasible would be to make a DYI wireless headphone plug-in kit??

What I had in mind was something like a transmitter that would plug into my computer jack's sound out and then would transmit the sound over to a receiver that would plug-in any head/earphones I might desire.

As for the wireless delivery module, I thought I might try the arduino with the nRF24...+ modules, but perhaps I'm being naive.

My main concerns are, for it to be reasonable inexpensive, have a reasonable range (for me to roam around inside my small apartment), resilient to interferences and the sound quality not to be degraded to utter crap :p 

Now with crazy madz inkscape (lack of) skillz!!!

Further reading ( my "public bookmarks" derived from shout box conversation)







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Another idea would be to use your homes power supply to encode and trasnmit audio through the wires of your house .

Since in every room you got plugs then you got audio 

Well, currently I'm not feeling that adventurous to fiddle directly with the power lines :-) But I assume you mean turning them into a sort of giant antenna, because if not that would also defeat my purpose. Anyhow, depite cool, I'll leave the power lines untarnished by my touch :)

While it is way cooler to do it your own way, I don't know if you'll get as good of a result from the nrf24. The data rate is about a third of Bluetooth's, which will mean more dropouts and lower audio quality. Bluetooth shields are comparable in price to what you're looking at. It might be reinventing the wheel at that point though. I have a pair of Sony md br21gs that I love for my iTouch/iPad. Maybe a Bluetooth repeater or range extender would be a good project here too?

Yes, the nRF24...+ modules were my first barely educated thought. I'm not opposed to other stuff provide it accomplishes what I want. Actually, I started all this by looking for bluetooth wireless headphones, but after first wadding through those silly earpieces for cellphones, I stumbled with some chinese el-cheapos and then only high-end pricey ones :s overall I wasn't too impressed with the reviews. More over bluetooth onces seemed to have a range of 7-10 meters, and it would be nice to have at least double that.

Then again I also contemplated some power amplification for a bluetooth module if I end up going the route I proposed above.

For the time being I'm collecting ideas, and planting a seed for self learning, even if I end up not doing the above project I'll be wanting to learn something about handling sound and wireless communications :)


As for your headphones,  the closest I've found were the DRBT21GB and DR BT 21G and I found them a bit expensive (for what I'm willing to pay) still, I am now leaning towards searching for some affordable bluetooth set, and then just Power Amplify if I found myself needing some more range.