XPost: alt.engineering.electrical, sci.electronics.design, sci.e   
   ectronics.repair   
      
   On Thu, 27 Oct 2011 17:59:59 GMT, spam@spam.com (Don Pearce) wrote:   
      
   >On Thu, 27 Oct 2011 09:11:17 -0700, DaveC  wrote:   
   >   
   >>> Or, as is not uncommonly done these days in portable digital players,   
   >>> establish a floating ground for the purpose of providing and signal for the   
   >>> (floating) load, so that the difference between the output and the floating   
   >>> ground can become negative.   
   >>   
   >>Which raises the question I was pondering recently: is it OK to connect 2   
   >>computers' sound cards' grounds together?   
   >>   
   >No. You will certainly create a ground loop which will result in mains   
   >hum.   
      
   This is certainly likely but not a foregone conclusion.  In any case, it's   
   "OK" (i.e. not dangerous). As long as the computers are plugged into the same   
   circuit, it's quite possible that he can get away with it, assuming line   
   levels.  If hum is a problem, coupling capacitors or cheap audio transformers   
   will usually solve it.   
      
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