Wireless Headphones Mod

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Introduction: Wireless Headphones Mod

Mod to make my heavy wireless headphones work just as well with lightwieght and much more comfortable ear buds.

Step 1: Preparation

I started this project because I was unhappy with my Sennheiser HDR 45 wireless headphones.

3 things bugged me about these headphones. 1, they were leaky, everyone could hear what I was listening to. 2, prolonged listening made my ears hurt from the headphones pushing against my ears. 3, they make my ears sweat - blergh!

After doing some searching for wireless ear buds, and being shocked with how expensive they are, I decided to modify my Sennheisers to allow me to plug in my comfy Sony earbuds. I figured I could just wear the heaphones around my neck but have the comfortable earbuds in my ears.

Okay: Lets get started.

You can open these headphones by gently prying open the cover near the battery (see pic).

The very first thing I needed to do was find a low profile stereo mini jack. Be careful though, you need one that has 2 normally closed circuits that are cut off when the mini jack plug is inserted. Fortunately Radio Shack had exactly what I needed (cat # 274-246), it was $2.99, that's why I don't like shopping there :) But hey, it was a Sunday afternoon, and this project just couldn't wait.

Now that I knew the size and shape of the jack socket, I could try to find somewhere to mount it inside the headphones. I opened the side with all the electronics figuring that it'll be easier to make connections on there, and looked for a suitable space.

Step 2: Making Room

Once I'd located a suitable space for the jack socket, I set about removing things that were in the way.

I had to remove a post that was in the way and grind down a little plastic so there were enough threads sticking through my freshly drilled hole to enable me to thread on the panel nut.

Step 3: Wiring 101

Now the tricky part!

I poked around a bit with some test wires and followed some traces to find audio ground, audio left, and audio right. I soldered a wire from the audio ground directly to the ground pin on the mini jack.

For audio left and right, I had to intercept the signal before it reaches the headphone speaker. Then I cut the trace so that the signal doesn't get through. Use several strokes of a sharp knife to cut through the track, but be careful you don't cut anything else.

Once the tracks were cut I tested the headphones to make sure nothing was getting through. Then I took some thin wire, and connected both sides of the cut tracks to the correct pins on the mini jack. The way you do this is important so be careful and take note of the diagram on the back of the mini jack box. Basically the signal side of the cut track needs to go to the side of the jack that will connect to the jack plug when it is plugged into the jack. The heaphone side of the cut track should go to the return side of the jack socket.

Step 4: 'Ears How You Succeed

Once I'd tested one channel (and make sure it cut out when I pluggedin the jack plug), I repeated the process for the other channel.

I routed the wiring around the pcb to keep it out of the way and make it look somewhat neat, and went for the full test.

Sure enough, the headphones worked fine as normal. Then once I plugged in the ear buds the headphones went silent and the sound came out of the ear buds instead.

Success!

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    36 Comments

    The Myzone transmitter is FM. I just use a portable fm radio, tune it to the transmitter, and plug in my headphones. No hacking required. The cool thing about this is I can use it as an in ear monitor for my band. Saved hundreds of dollars.

    Awesome brilliant

    I don't really believe I am commenting on a decade old Instructable; but, on the offchance that somebody still has a set of these lying around... I have a pair with the base station and power supply but no audio cable - I can probably just solder a jack to the board but to save me the trouble of guessing, does anyone happen to know the pinouts?

    My question is for my dad. Would/could this same system work as a source for PC speakers? He doesn't like the headphones, but can't hear his TV, (he has hearing loss). Could I just change the jack to match a set of PC speakers, then he'd have a set of speakers right next to him, and he could control the volume to his taste. I know they make wireless tv speakers, but they aren't real affordable. Any advice would be appreciated.

    This mightn't be the right place to ask this but I have a pair of Sennheiser TR120, they look similar to the ones used in the instructable.. Anyway, if there's no signal for 3 minutes, they cut off producing white noise through the headphones.. it's very annoying if you've been listening to music and it ends then 3 minutes later SSSHHHHHHHHHHHHHHHHH!!!!!!!!!!!!!! hits you.. Don't know how many times I've been woken up like that.. it's not nice..

    Anyone know to prevent it?

    I thought about using Automator on OSX to play a sound every 2:30 minutes but not sure if it's possible. You can set loops but I'm not sure you can set them to repeat after a specified length of time..

    Any ideas for mods or hacks for this would be great..

    Great idea with the jack, I have exactly the same problem as I wear glasses and the headphones really hurt after a while..

    Thanks!

    Rob.

    in garage band make a song with no sound that I a couple of hours long that will play after your playlist

    Managed to sort the static problem and made an instructable on it here: https://www.instructables.com/id/Wireless-Headphones-3-minute-transmitter-cut-off-f/

    I've just done the mod in this instructable and it's working beautifully.. So glad I don't have to deal with the bulky headphones hurting my head after a while..

    Thanks for the instruction and inspiration!

    Rob.

    Regarding the wireless-ness of the headphones, I have a pair of fairly cheap ones, but I'd like to put them on a better (e.g. higher) frequency rating, because my mom's baby monitor interferes with them. Can I do this simply by replacing some crystal oscillators inside the receiver (headphones) and the transmitter (base)?

    Great instructable! I did the same with my trusty old Advent Wireless headphones. But, not wanting to clutter up the site, I did a sweep of Instructables.com, and discovered that you already have the bases thoroughly covered. Really, ALL wireless headphones should be manufactured with a "stereo out" jack! But, more importantly, I need to add, that the main reason for installing a "stereo out" jack, on my wireless headphone, was to function as part of a professional sounding 12VDC outdoor sound system -on a shoestring budget. I use a vintage late 1970's ghetto blaster (30 watt G.E. model#3-5265-A) with 5" internal heavy magnet speakers and real horns, for everyone to plug in their ipods, at outdoor picnics. For a small unit, it has great sound, and the speakers were built to last forever. Now, with my modified Advent Wireless headphones, I can now hook up my lean-and-mean 6VDC Virgin boomtube, mounted on a tripod, placed 60-70 feet away, on the opposite side of the crowd. A stereo "Y" connector is used to pipe mp3 tracks into both the G.E. ghetto blaster, as well as the 12VDC Advent Wireless transmitter. And, with this setup, everyone can clearly hear the music, and no one complains that it's too loud.

    I did it with my old Acousatic Research AW721 and it work good !Thx a lot !!!