Head-Fi.org › Forums › Misc.-Category Forums › DIY (Do-It-Yourself) Discussions › Male TRRS to Two female TRS connector wiring (for mic)?
New Posts  All Forums:Forum Nav:

Male TRRS to Two female TRS connector wiring (for mic)?

post #1 of 5
12/28/11 at 10:48am
Thread Starter 

Greetings!

 

I have a gaming headset I like with 2x 3.5mm TRS connectors (one for the headphones, one for the mic).  I want to use it with my iPhone for long calls I've found the Headset Buddy connector but want an angled 4 pole connector.  I've build a bunch of my own 3.5 cables and headphone re-calbes before so I figure it shouldn't be too hard.

 

I found a nice Calrad angled 3.5mm 4 pole on Markertek.  

4 pole wiring

Tip = left signal

Ring = right signal

Ring = ground

Sleeve = mic

 

Headphone Female 3.5 TRS is wiring

Tip = left

Ring = right signal

Sleeve = ground

 

Mic Female 3.5 TRS wiring?

I assume the mic is mono but the connector from the headset is TRS (3 pole).

I assume 1 signal and one is ground.  Looking at other mono connectors, Tip is signal and the bottom (sleeve) is ground?  What is the center ring?

 

Thanks

Reply
post #2 of 5
12/28/11 at 8:13pm
Thread Starter 

Did some more searching and didn't get a definitive answer but I think i figured out the mic is mono, mic signal is tip, ring isn't connected, sleeve is ground on the 3.5 TRS female and shares the ground ring on the 4 pole TRRS male side.

 

Male 4-pole connector wiring

Tip = left signal

Ring = right signal

Ring = ground (shared from both Headphone and Mic ground)

Sleeve = mic signal

 

Female Headphone 3.5 TRS wiring

Tip = left signal

Ring = right signal

Sleeve = ground

 

Female Mic (mono) 3.5 TRS wiring

Tip = mic signal

Ring = not connected

Sleeve = ground

 

If anyone can confirm this is correct, that would be great.

 

Also, found this nice one online for $23.

http://touchmic.com/products-page/ipad-ipod-touch--iphone-microphone-adapters--extension-cables/headphone--mic-y-adapter-in-one-cable/

 

Reply
post #3 of 5
12/28/11 at 10:59pm

I have been doing some research on this myself for an upcoming mod I have been planning. Your guess is correct. The tip is the mic, the ring is not connected (unless the mic needs the +5V bias), and the sleeve is ground. Here's the few good sources I found on it:

 

 

 

Quote:

The 3.5 mm mic input is usually a "TRS" (Tip, Ring and Sleeve) sometimes called a stereo connector, although sometimes this may be a "mono" connector that has only the "Tip and "Sleeve". In both configurations the "Tip" will carry the audio signal and the "Sleeve" is the ground connection. On the "TRS" connection the "Ring" portion is often used to carry a low DC voltage (bias voltage) for powering a computer microphone.

 

Source: http://www.audio-technica.com/cms/site/4ffc7039c199613a/index.html/index.html#computer (It's under the "How do I connect a microphone to my computer?" link)

 

 

Quote:
  • Signal input (tip)
  • +5V bias (ring)
  • Ground (sleeve)

 

Source: http://www.hobby-hour.com/electronics/computer_microphone.php

 

 

 

And now the important source, the PC99 specification written in 1999 by Microsoft for building PC components:

 

Quote:

 

Three-conductor 1/8-inch (3.5mm) tip/ring.sleeve microphone jack with bias on the ring to support both three-conductor electret microphones or tip and ring shorted together for two-conductor dynamic microphones. In either case, the sleeve connects to ground.

 

Source: http://www-pc.uni-r.de/hardware/TECHDOK/PC_99_1.pdf

 


Edited by FootSpaz - 12/28/11 at 11:01pm
Reply
post #4 of 5
12/29/11 at 10:31am
Thread Starter 

Thanks. This is exactly the info i needed.

 

The question I have now is if the mic (depending on the type) needs the 5v or not for connectivity to the iPhone.

 

Reply
post #5 of 5
12/30/11 at 7:46am

Well, I don't actually have a source for this, but I'm going to say that it doesn't need the +5V bias. Two reasons for this conclusion:

 

1) That 5V bias is almost never used. Only a few computer mics back in the earlier years of the last decade actually took advantage of that. I don't think anything recent has used it.

2) There aren't any connections left from the 4-pole iPhone jack to use for it. The tip and both rings are already taken and the sleeve is used for the mic signal, so they would need a third ring if they wanted to supply the 5V bias.

Reply
New Posts  All Forums:Forum Nav:
  Return Home
Head-Fi.org › Forums › Misc.-Category Forums › DIY (Do-It-Yourself) Discussions › Male TRRS to Two female TRS connector wiring (for mic)?