XPost: sci.electronics.repair   
   From: spam@spam.com   
      
   On Tue, 7 May 2013 03:46:38 -0700, "William Sommerwerck"   
    wrote:   
      
   >> Construction of these transformers doesn't have to follow the normal   
   >> rules. They don't need good linearity, so very high permeability   
   >> ferrite can be used for the core in order to get a high inductance   
   >> value. This is because the audio doesn't have to pass through the   
   >> ferrite, it bypasses it.   
   >   
   >?????????????????????????????????????????   
   >   
   >I know of no transformer type in which the signal "passes through" the core   
   >material.   
      
   Nit-picking the terminology? In a transformer, the core is used to   
   couple the signal from the primary to the secondary. In this sense the   
   signal "passes through" it. In the series balun the only signal that   
   interacts with the core is the unwanted common mode or single sided   
   signal. This is generally of such a low value that it has no chance of   
   causing sufficient field strength to cause non-linearity.   
      
   d   
      
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