XPost: alt.engineering.electrical, sci.electronics.design, sci.e   
   ectronics.repair   
   From: spam@spam.com   
      
   On Wed, 09 Nov 2011 20:49:28 +0000 (GMT), Stuart   
    wrote:   
      
   >In article <4ebae303.100219082@news.eternal-september.org>,   
   >   Don Pearce  wrote:   
   >> >Provides a Vcc/2 local "ground" so I can use these op amps with a single   
   >> >supply voltage.   
   >   
   >> More useful to let it oscillate as a square wave generator at 100kHz   
   >> or so, and rectify the output into a negative 15V rail. That way you   
   >> can run the op amps the way they are meant to be run.   
   >   
   >KISS   
      
   Exactly. Much easier than all these halved supplies, coupling caps and   
   multiple grounds.   
      
   d   
      
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