Wirless IR Headphone hack.
So I got these things at Radio shack during a Christmas sale about 2 years ago for $15.00.
They were pretty cool to use, but not really conventional so I put them in a box and didn't see them for awhile... A couple months ago I came across them and decided that they could be used to play music from my computer on my stereo that is across the room.
This is the story of how I did it:
First thing first take the headphones apart and analyze what need to be done. I knew I needed to be able to plug the reciever into the wall (using a wall wart) and I also knew that I needed an outout (a mini-jack in this case)
Inside of right Head phone:
Inside of left headphone:
So To solve the problem of power I would need a 3 volt wall wart (2 AAA batteries = 3 volts)
I searched and search through my junk boxes and all over the house for a wall wart of the right voltage, but the best thing I could come up with was a 4.5 volt memorex one... I decided to take my chance and use this one... (It works fine)
The batteries were wired in series (one in each side of the head phone) I soddered the positive and negative terminals from the left head phone together on the left headphone daughter board. (just added some more sodder between the terminals on the pcb) Then I soldered on the wires from the wall wart to the right headphone (making sure to match positive to positive and vise versa).
Now that the problem of power is solved we have to add an output... To do this I cut a mini-jack off of an old dial up modem (If you don't know what a mini-jack is by now it is the same this you plug your headphones into on you portable cd player, or for you rich kids, your ipod). I desoldered the wires that went to the speakers and then put in new wires an ran them to the mini-jack. There are 4 wires, two of which are ground and two more of which are for the left and right channel.
Simplified wiring diagram for mini-jack:
There are two ir recievers (one in each ear) you want to make sure that you cut a hole in your new case for them to be glued in. The enclosure I used was an old plastic case from a 95 cannon laptop batterey... Ugly, yes, but it serves its purpous.
Iside entanglements of case:
I made sure to position the pcb inside my case so that I could acess the on off switch (I never turn it off tho). I turned the volume up on the receiver all the way before shutting the case. I also cut a hole for the power indicating led...
I cut a hole in the back for the mini-jack outpt.
It isn't pretty, but it is very nice having 250 watt surround sound system for your computer...
If you have any questions leave a comment or email me at firstname.lastname@example.org