DIY Audio Projects Forum
 NEW  Matt presents bias and operation data for the 6V6 tube in SE operation - 6V6 Single-Ended (SE) Ultra Linear (UL) Bias Optimization.

DIY Audio Projects Forum

Welcome to the DIY Audio Projects Message Forum. Use these forums to discuss Hi-Fi audio and to share your DIY Audio Projects. Registration is free and required to post messages and view the file attachments. Registration will only take a minute and registered users do not see any advertisements. After you have completed the online registration process, check your email (including spam/junk folder) for the verification email to activate your account. New members are under moderation - so your posts will not be visible until approved by a moderator. See the Read Me 1st, Forum RULES and Forum FAQ to get started on the forum.

It is currently 22 Feb 2018, 12:00

All times are UTC - 6 hours [ DST ]




Post new topic Reply to topic  [ 5 posts ] 
Author Message
PostPosted: 28 Jul 2017, 02:34 
Offline

Joined: 28 Jul 2017, 01:40
Posts: 1
I acquired two sets of headphones with a special plug (shown in the attached image). Of course I cant plug this special plug into my iPhone so i decided to replace the jack with a regular 3.5mm one. the soldering was successful and the music plays however it is very quiet. I have a feeling this is because one of the five wires coming from the headphones is the power for an amplifier inside the headphones. I have to say, I am no electrician so I don't know if this is the case. By the way the colours of the five wires are: Red, White, Blue, Green and Pale Brown.

Why is the music quiet? and what should i do with the three left over wires coming from the headset?

Thanks, appreciate any help


This post has a file attachment. Please login or register to access it. Only Registered Members may view attached files.



Top
 Profile  
 
PostPosted: 07 Jan 2018, 08:00 
Offline

Joined: 26 Oct 2012, 21:00
Posts: 190
Location: ontario canada
make and model of the headphones you have would help.
are these communication headsets?
are both earpieces working with only two wires connected?


Top
 Profile  
 
PostPosted: 07 Jan 2018, 10:26 
Offline
User avatar

Joined: 08 Aug 2009, 03:11
Posts: 2161
Location: Chilliwack, BC
Hi,

If a continuity test shows the wiring correct, I suspect these are high-Z headphones and no iPhone/Android/player powered from 3V can drive them.

High-Z needs voltage while low-Z needs current. Current is far easier to design for in battery devices.

Cheers!

_________________
-= Gregg =-
* Ratings are for transistors - tubes have guidelines*
Home: GeeK ZonE
Work: Classic Valve Design


Top
 Profile  
 
PostPosted: 09 Jan 2018, 14:04 
Offline

Joined: 09 Oct 2012, 19:43
Posts: 266
Location: Vancouver Canada
What has been already said is true. Also you have only used 2 wires which means you have the phones (at best) in series. You need to find 2 wires which drive one phone only. Mark these 2 wires then find the other 2 which drive the other phone. The phones may use a common ground which means you will have 3 wires for the phones instead of 4. 1- for left. 1- for right. then 1- for common ground or 2 if the phones are separately wired.
The 3.5mm plug is wired as Tip=left, ring=right, and long ring is your ground. The ground is where you will connect one or two wires depending on whether phones have separate wiring or a common ground for both phones.
If you have an electronics store close by it may be possible to get them to test the impedance of the phones for you. (take a paper and pencil) 32 ohms will work great but if they are very high impedance then you are hooped without an additional amp to drive them.


Top
 Profile  
 
PostPosted: 09 Jan 2018, 14:27 
Offline

Joined: 09 Oct 2012, 19:43
Posts: 266
Location: Vancouver Canada
This may help to give you an idea of how they may be wired.


This post has a file attachment. Please login or register to access it. Only Registered Members may view attached files.



Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 5 posts ] 

All times are UTC - 6 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 2 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Jump to:  
DIY Tube Projects :: DIY Tube Amp Kits :: DIY Speaker Projects :: DIY Solid State Projects :: DIY IC / Op-amp Projects :: DIY Phono Projects :: DIY Cable Projects :: Hi-Fi Audio Schematics
© diyAudioProjects.com - Terms of Service - Privacy Policy