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   On Sun, 30 Oct 2011 02:26:06 -0700, DaveC  wrote:   
      
   >> Why not go active and get rid of the caps altogether?   
   >   
   >Thanks John. Good simple design.   
   >   
   >Can you suggest a good op amp for such an audio application?   
   >   
   >Is it possible to use single-supply amps throughout?   
   >   
   >Thanks,   
   >Dave   
      
   The best amps are pretty much all dual supply. The big advantage is   
   simplicity of the circuit - and of course not having the coupling caps   
   (you need to put another set at the output, by the way).   
      
   Generating a negative rail is pretty simple even if you only have a   
   positive one available. An oscillating op amp, a diode and a capacitor   
   does the job nicely.   
      
   d   
      
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