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TRRS to TRS adapter ( 3.5mm balanced TRRS to single ended TRS adapter )

post #1 of 46
Thread Starter 

TRRS to TRS adapter

 

HiFiMAN HM-901 in balanced mode used with the balanced phone TRRS plug.

This topic will DIY adapter for convert that balanced phone to 3.5mm single ended in compact size.

post #2 of 46
Thread Starter 

This is the structure of balanced TRRS plug that used with HM-901.

post #3 of 46
Thread Starter 

The main problem >>> I can't find the high quality female TRRS jack.(at July 2013)
Now they are  TRS Oyaide  and  TRS Rean(Neutrik) jack.(that I think they are good enough)

 

 

I choose to modify the Rean(Neutrik) because its body shorter...can total put into Viablue body.

post #4 of 46
Thread Starter 

Survey internal structure of Rean(Neutrik) jack.

 

 

post #5 of 46
Thread Starter 

The position when plugged with TRRS plug.

3 pins that contact to TRRS.

 

Pin for T...tip.

 

Pin for R1...ring

 

Pin for R2...ring

 

*** no any pin to contact with S...sleeve .

post #6 of 46
Thread Starter 

If the body of TRRS plug made from metal.

S...sleeve can contact with the body of Rean(Neutrik) jack.

 

The right- signal can flow pass body to body.

post #7 of 46
Thread Starter 

But in some conditions.

 

- the metal plug has a gap between them with the position at very centrical.

- the plug's body made from plastic with the position at very centrical.

>>> no any part of the S...sleeve can contact with the TRS jack.


Edited by Komkrit - 8/4/13 at 8:14am
post #8 of 46
Thread Starter 

For this reason I will insert the fourth pin for contact with S...sleeve.L3000.gif

 

In the picture, The largest area is above the left signal pin.(blue arrows)

 

This area is the safety zone that can insert the fourth pin.

>>> not damage or cantact with another pins.

 

When look at the outer of normal jack.

I will make a hole at blue arrow.(in a line above the left signal pin)

post #9 of 46
Thread Starter 

Make a hole by drilling.

 

*** Try to drill just beneath the rim of the TRS jack.(about 2mm.)

For ensure that the fourth pin can contact with S...sleeve

and not below to contact with the internal left signal pin.

post #10 of 46
Thread Starter 

The fourth pin I get it from the first Rean(Neutrik) that I had opened it to survey the internal structure.

One jack has 2 long pins and 1 short pin.

Thus pin 1 , 2 , 3 and the fourth pin come from the same material for the same sound quality.o2smile.gif

 

post #11 of 46
Thread Starter 

Bend the fourth pin.

 

 

Test by put on the jack's body >>> head of the pin into the hole.

post #12 of 46
Thread Starter 

Prepare for solding.

 

Mark the length of the Viablue body.

 

Cut and bend all legs of the Rean(Neutrik) jack.

 

Cut the ground leg of the Viablue plug.

 

 

Measure the lenght again.

*** the left signal pin of Viablue touch to the base of Rean(Neutrik) jack.smily_headphones1.gif

      This is the shortest length that I can do.

post #13 of 46
Thread Starter 

Solder the Rean(Neutrik) jack to the Viablue plug.

 

Solder the fourth pin to the Rean(Neutrik) body.

***Solder at the end only.

Leave the body and the head of the fourth pin free.

 

The fourth pin act as the spring when plug and unplug.

-if solder at distal >>> the spring will soft.

-if solder involve to the mid part of pin >>> the spring will hard.

 

The softer spring dose not damage the TRRS plug of the earphone in long term usage.o2smile.gif o2smile.gif

post #14 of 46
Thread Starter 

The fourth pin for S...sleeve when look inside the jack.

post #15 of 46
Thread Starter 

Test the fourth pin.

 

This is in the normal position.

 

When the jack has been plugged in.

The fourth pin will spring out.

 

When the jack has been unplugged >>> the fourth pin will return to the normal position.smily_headphones1.gif

As in the first picture.

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