XPost: alt.engineering.electrical, sci.electronics.design, sci.e   
   ectronics.repair   
   From: spam@spam.com   
      
   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.   
      
   d   
      
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