Instructables
Assemble a switch box to switch from listening to music on head phones to listening to answering your phone with your left ear, while music continues in the right.

(requires some electronic components, and basic soldiering skills)
 
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Step 1: Explanation:

Hokai, so I was getting tired of having to take off my head phones when having to take a call, and I was wishing I could listen to music while on hold or on a boring call.

So the idea was born and after a quick trip to my local electronics store, so was the final product.

Step 2: The diagram:

Picture of The diagram:
100_1943.JPG
My apologies for the poor quality, but this crude diagram should be all the info you need to assemble this project.

The bottom right is the mic line, this is where you plug in the microphone for your phone conversations.

Second from the bottom on the right is the phone plug. This will require you to obtain a female 2.5mm stereo jack and get a male to male 2.5mm stereo cord to plug into your phone. I used a 3.55mm female stereo jack on the body, and made my own male 3.55mm stereo to male 2.55mm stereo cord.

Third from the bottom on the right is the auxilary plug. This is where your music comes in from. Basic 3.55mm female stereo jack.

Top left is obviously where you plug in your headphones.

Step 3: Topology

Picture of Topology
I recommend setting the jacks and the switch in a cardboard model of the altoids tin (with just two sides) so that when you soldier the topology of jacks is maintained. My first version was in a regular sized altoids tin, and had the jacks facing up. This was easier to wire, but wasn't as nice.

Suprisingly, this rats nest wasn't too hard to soldier together, and held it's shape once removed from the cardboard test housing.

Just remember to PLAN AHEAD!
wyatt_heaton6 months ago
What would you recommend doing if the headphones already have a mic?
0Troy (author)  wyatt_heaton6 months ago

Depends on how the mic is attached.

What mic plug comes out of the headphones? Regular mono 1/8"? Or is it combined into one plug like a hands free headset?

abadfart3 years ago
brilliant i ra across this along time ago and have been trying to find it ever since. i just modded my helmet to let me put some speaker elements out of a pair of headphones from the 70s and im thinking ill add a mike and run it all to a pocket on my jacket
grundisimo6 years ago
this idea is genius!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!AHHHHHHHHHH!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
WHERE DID YOU GET THE SOUR TOIDS GUM!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
0Troy (author)  TheMoonMaster6 years ago
TARGET!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!1!1!11ONE1!2211 By the way, the stuff is like candy. Not recommended as gum :)
anonyjames8 years ago
Since all your grounds are hooked together anyway, couldn't you just use a SPDT switch instead of DPDT?
0Troy (author)  anonyjames8 years ago
Not sure. I think technically, yes, but I haven't tested that, nor do I understand the full impact of doing it. I'm of the mind that there should be as few things connected to eachother as possible. But if you try it out (or I test it out) let me know, and I'll update the instructions.
Da_Fudge 0Troy6 years ago
you can.
berserk7 years ago
I have been trying to find a plan on how to make something like this for my desk phone. Apparently the technology isn't as nice and compatible as it is between a cell phone headset and a pc/music headset. Does anyone know if this would work if I added an input like the one on my desk phone headset, and how the cables would be set up?
0Troy (author)  berserk7 years ago
Your best bet would be to take apart or otherwise discover the connections on the headset, and splice the wires together accordingly. I actually have a plan in the works for one of these for my work phone using the rj11 connector and my quality headphones and a mic attachment.
berserk 0Troy7 years ago
I hope you make an instructable when you execute the plan that is in the works :-)
sk8er68 years ago
seems like a good idea to make a line in into a mic to record music clearly.
sk8er68 years ago
seems like a good idea to make a line in into a mic to record music clearly.
0Troy (author) 8 years ago
0Troy (author)  0Troy8 years ago
I can hack together an in-line music volume control, but don't want to have to mess with housing. Time to hit the 99 cent store again, and see if they've got a mic/volume control hands-free...
dainsane18 years ago
neat i quite like is too bad i have to get a bluetooth ear peice as a slight mod for earbud users: have one ear be used for a mic tho one would have to pull one earpeice out and hold it as a mic tho depending on the sencitivity it ma be able to be clipped to a collar??
0Troy (author)  dainsane18 years ago
Do-able!! Though the original idea was to be able to use your better headphones, you could hack together some headphones and a phone earpiece so one headphone wire could use one of those in-line mics, you'd just have to split off the leads, and probably make your own 3.5mm stereo jack, and mic jack as well.
0Troy (author) 8 years ago
The blue is always audio. However on the AUX, the blue is the left audio, and red is right audio. On the phone jack, the blue is the speaker, and the red goes to the mic.
djdriftx8 years ago
one more (noob) question, in your diagram the green is ground, then what are the red and blue wires. thanks
0Troy (author) 8 years ago
Updated some pictures, added clearer diagram
dpartin8 years ago
Good idea, I've been planning on something similar. Another comment, maybe closer up photos? Under topology most of the picture is the background, hard to see actual layout (by design?). Thanks.
0Troy (author)  dpartin8 years ago
Unfortunately there isn't much to see on that topology picture, only a mess of wires and some electrical tape seperating some soldiering points on the jacks. The topology I've layed out is just a recommendation, your topology is really dependent on how you want the final product to look. However if you're still interested I've posted the whole image (2304x1728) here: http://tinyurl.com/jqd77
0Troy (author) 8 years ago
yep, I"ll bust something out in paint... =)
djdriftx8 years ago
Hey, great plan/idea, would it be possible for you to make a clearer diagram so I can see what is what. Thanks