XPost: alt.engineering.electrical, sci.electronics.design, sci.e   
   ectronics.repair   
   From: invalid@invalid.net   
      
   > Here's the whole thing; DC coupled mixer with a charge pump for a   
   > negative supply:   
   > [J. Fields]   
      
   Thanks John. Nice design.   
      
   What part is used for SW1-3? Purpose? If these are "anti-thump" turn-on   
   suppression switches, I think the main amp is similarly turn-on delayed. Of   
   course it's important to know the timing of these to avoid any window through   
   which the sub's cone could launch (or lunch?)...   
      
   Thanks,   
   Dave   
      
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