From: trevor@home.net   
      
   "Bob"  wrote in message   
   news:ln5dmk$5sq$1@dont-email.me...   
   > My son just bought a new pair of Bose Headphones, the "SoundTrue" model.   
   > Their .pdf manual says the Plug is 3.5 mm and also 1/8 inch.   
   > Obviously, it can't be both, as their is a "meaningful" diameter   
   > difference (0.0057) beteen these two dimensions.   
      
   Actually they can, since they simply rely on the socket spring contacts   
   bending in or out a little. They are definitely NOT precision connectors.   
      
      
   > I used to remember that there was always a bit of a problem, as some Plugs   
   > that mfg's used were 1/8 inch, and some were 3.0 mm (not 3.5 mm).   
   > The reason I'm asking is that when he plugs it into our (old CRT style)   
   > Panasonic TV audio output Plug, it wiggles a lot and does not make good   
   > contact.   
      
   A pretty common problem, especially when the sockets have had a fair bit of   
   use.   
      
      
   > Can someone who is a lot more knowledgeable about these kinda plugs and   
   > jacks perhaps straighten us out on all of this. (are there adapters ?)   
   >   
   > Also, the Plug seems to have 4 electrical sections.   
   > Have never seen one with more than 3.   
      
   They have been used in video camera's for *many* years, and headsets that   
   have both stereo audio and microphone connections.   
      
      
   > What are (each) of them for, please ?  Diagram anywhere ?   
      
   That would depend on the actual device. Apple for a start use different   
   connections than most others. I have no idea what Bose have done in this   
   case, but the info should be available somewhere.   
      
   Trevor.   
      
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