From: MrTallyman@BananaCountersRUs.org   
      
   On Tue, 07 May 2013 16:11:06 GMT, spam@spam.com (Don Pearce) wrote:   
      
   >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   
      
      
     An inductor is NOT an inductor UNLESS the TURNS pass THROUGH the core.   
   (where a ferrous "core" is involved)  An air core type inductor probably   
   has different behavioral models for its operation (they do), but the   
   turns are counted within a toroidally wound structure, and on the inner   
   walls of other shapes of "core".   
      
     The turns count is exactly the number of turns that appears WITHIN the   
   core.   
      
     A transformer cannot work unless BOTH WINDINGS are WOUND AROUND and   
   THROUGH the CORE.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)