I am working on a small project and this is my requirement: I already have a headphone which I can plug into an audio jack. I need to make this headphone wireless. Right now all I can think of is attach an audio sender dongle to the two line audio jack and a receiver at the other end.Is this the right way to go? Or are there some other alternatives? The key area that I would like to focus on is building the radio transmission along with its reciever. Needless to say the bluetooth protocol is something i would definitely have to focus on.
I was looking into exactly the same project and I rules out Bluetooth and Wifi. Bluetooth has some serious interference issues, especially in places where wifi networks already exists. It will not be very reliable and sound quality will suffer.
The best solution I have found so far is Kleer Wireless technology which is distributed by SMSC. It's the technology used by Sennheiser for their high end wireless headsets. Like you, I would like to use my own headsets, I have nice Bose QC15 and they would work much better than any pre-built headsets.
Here is a link to their chip: http://www.smsc.com/index.php?tid=346
I did contact them and they have sent me a bunch of stuff but my knowledge in electronic is limited and I have to say I'm a bit stuck..
[Update] Since then I have actually made progress. I bought a used pair of Sennheiser RS160 and took the headset appart. Then I unsoldered the battery holder (which are part of the headset, and un-soldered the speakers and put and female 3.5mm Jack instead. I bought a standard battery holder for 2 AAA and here you go. Slapped all this in a box and you got your self a device on which you can plug your nice headset. Works like a charm.
hope this helps you, cheers Antony
I would suggest to start with something simple like IR audio transmission. The most easy thing to do is shown here: http://www.youtube.com/watch?v=MAYl_uNmpLo
More advanced circuits look like that: http://imageshack.us/photo/my-images/815/infraredsystem.gif/