XPost: sci.electronics.repair   
   From: bobnospam@gmail.com   
      
   Don Pearce wrote:   
   > On Sun, 05 May 2013 23:04:35 -0700, isw  wrote:   
   >   
   >>>>> Looks OK to me. It's configured as a series common mode stopper.   
   >>>>> What's the problem?   
   >>>>>   
   >>>> Will this design eliminate ground loop problems? My concept of   
   >>>> baluns was that   
   >>>> they isolated the two ends by placing them on opposite windings of   
   >>>> a transformer. I am no expert, which is why I asked.   
   >>>>   
   >>>   
   >>> That is a different thing. You need a transformer to kill a ground   
   >>> loop entirely, but yes, provided there is enough inductance in the   
   >>> coils this will still make a good job of getting rid of hum from a   
   >>> ground loop.   
   >>   
   >> If there's enough inductance to attenuate 60 (or 50) Hz from the   
   >> power line, why won't it do the same for similar frequencies in the   
   >> desired signal?   
   >>   
   >   
   > No, because of the way the windings are arranged their inductances   
   > cancel each other out for the audio signal, but not for the induced   
   > hum.   
      
   The windings being on a transformer arranged so that common mode noise cancels,   
   and the signal doesn't?   
      
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