Instructables
Why?
- Well the reason for this experiment was that the new Macbook Pro 13.3 only has a single audio out/in jack. The Operating System allows you to change it to input or output. After using my nice headphones with a microphone built in I was saddened that I could not use these. I had to sacrifice one or the other.

- Now when I was browsing the apple support forums one user said the Macbook will allow you to use your iPhone headphones and be able to use the microphone as well!! AWESOME! Now I had to find a product that could do just that.

- After obtaining the DLO headphone splitter (because it says it supports mic input), it didnt work.
The problem is in the pin outs of my and most common 3.5mm mic jacks use the tip as the signal and the sleeve for the ground (pic will follow). Apple uses the sleeve for the mic and a common ground in the middle.
Time to change that!!!
 
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Step 1: Tools and Parts

Picture of Tools and Parts
You will need:
- Soldering Iron
- Solder (resin core most popular)
- Pliers
- Diagonal Cutters
- Small Flat Head Screwdrivers
- Small guage wire
- Helping Hands (not needed but they do help!)
- X-Acto Knife
- Patience

You can get the D-LO adapter from e-bay (for about 15 bucks)
part number: DLZ70003 or DLZ70003/17
Product Link: http://dlo.com/Products/cable_headsplit_Prod.tpl

Pin out reference: http://pinouts.ru/PortableDevices/iphone_headphone_pinout.shtml
Sassah1221 year ago
The instructable is good but I found it cheaper to slice the connector off a iPod head phone and wire up the wires to two ports.
have i to use the 1.6k resistance on mic connection as given in pin out site or i have to connect it directly
sarkmc1 year ago
have i to use the 1.6k resistance on mic connection as given in pin out site or i have to connect it directly
xgrep4 years ago
It's hard to believe that an adapter such as what you have built isn't commercially available, given the obvious need. Apple could sell them for $39.99. Nice job.
Actually, there are some out there, marketed for the iPhone instead of the MacBook, since they have the same pinout.  The ones I've found are about $5 more.

However, this design is really good "outside the box" (or is it see what's inside the box :-) thinking!
Hi RetroTechno,

Any chance you have a link to the ones marketed for the iphone? Are they basically the same thing?
plastiqmanb (author) 4 years ago
 The pin-out research was all thanks to pinouts.ru
plastiqmanb (author) 4 years ago
 Thanks a lot guys for all the comments for this being my first instructable!
madragonn4 years ago
Hi,

do you know if the DLO splitter has a chip in that tells the macbook it is both and input and output ?

I have tried with just a 4 cable jack and croc clips but it didnt give me anything in system preferences

thanks
plastiqmanb (author)  madragonn4 years ago
 After taking it all apart and breaking the solder joints there was no 'chip' or any other properitary device that made it work...  I would double check the pinouts.  Heres the thing, when i have just the adapter connected to my macbook it doesn't do anything.  When i plug in my headphone it goes to the headphone only, when I plug in the mic, it then goes to both modes.  Interesting....
ahhhh, i think i was using the band closest too the base as ground when checking your pin-out it is the second one in , stupid mistake i will try again tonight
Nope, No luck using a standard 4 connection jack, I get the audio out coming from pins 1+2 using 3 as a ground but I cant get the mac to recognise there is a MIC channel too...

i will try and borrow a friends iphone headphones to test if they kick it into thinking it has mic in as well as audio out

Thanks anywho, i now know that it is possible some way.
dong12255 years ago
So the fact that iPhone earphones are compatible with MacBook means that it can be used vice versa right?
Using this adpater, I will be able to plug in my own set of headphone and mic for my iPhone right?
plastiqmanb (author)  dong12255 years ago
 You are absoluletly correct.  I just tried it out on my iphone 3g and it works like a champ.  The only thing that the iphone headphones has is that little clicker which is actually shorting the mic to ground.  you can easily add that OR probably pickup a iphone headphone adapter that gives you both headphone and mic hookup.... well thats what i thought i bought for this but didnt work so watch out!
Well, thank you! I was looking for a way to hook up mic and headphone to my SIP enabled iPod touch as this paid SIP service is much clearer than the Skype but I couldn't find any commercial adapter that allows me to plug in my own mic in. This will definitely help, I should look for some way to hook up the remote too, that'd be cool.
bullygram5 years ago
awesome i like it
Stevanx5 years ago
Nice guide with a fine quick explainment. A "question", when you say headphone input, i take that you mean output =)?
plastiqmanb (author)  Stevanx5 years ago
yeah you got it :D