Critic's Corner

Posted by Charles Hansen (M) on March 22, 2009 at 18:53:16

In Reply to: RE: There have been many discussions here and elsewhere that posted by audiophilect on March 22, 2009 at 08:36:57

Hahax is wrong about needing an op-amp in a CD player. Even a discrete one. There are many that are built with discrete, non-op-amp circuits. Two examples are the Ayre D-1xe DVD player and the Ayre C-5xe MP universal player.

The Ayre CX-7e uses *integrated circuits* to keep the costs down, but they are not op-amps. An op-amp uses feedback as its basic operating principle. The integrated circuits in the Ayre CX-7e (and AX-7e) use no feedback. They are essentially just a collection of transistors in one package.

• RE: Just to clarify... - audiophilect 06:34:13 03/23/09 (5)
  In Reply to: RE: Just to clarify... posted by Charles Hansen on March 22, 2009 at 18:53:16

  Charles,
  
  Thanks for the clarification.
  
  Just want to make sure I understand correctly your comment about the CX-7e. The output of the IV circuit is NOT connected to its current input via a resistor, right?
  
  

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  • RE: Just to clarify... - Charles Hansen 21:54:57 03/23/09 (4)
    In Reply to: RE: Just to clarify... posted by audiophilect on March 23, 2009 at 06:34:13

    > > The output of the IV circuit is NOT connected to its current input via a resistor, right? < <
    
    None of our circuits in any of products have the output connected back to the input via any connection of any type. That would constitute a feedback loop, which we do not use.
    
    

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    • Thanks for the clarification (nt) - audiophilect 07:19:39 03/24/09 (3)
      In Reply to: RE: Just to clarify... posted by Charles Hansen on March 23, 2009 at 21:54:57

      
      
      

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      • One more question - audiophilect 13:13:58 03/25/09 (2)
        In Reply to: RE: Thanks for the clarification (nt) posted by audiophilect on March 24, 2009 at 07:19:39

        Charles,
        
        I just looked at the datasheet for the integrated circuit. Do you use a resistor connected to pin 5 to set the output voltage? If you do not feel comfortable answering the details I can understand. Thanks.
        
        

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        • RE: One more question - Charles Hansen 11:20:20 03/29/09 (1)
          In Reply to: RE: One more question posted by audiophilect on March 25, 2009 at 13:13:58

          Yes, access to pin 5 is crucial. It is one of the few IC's that allow access to that node.
          
          

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          • RE: One more question - audiophilect 07:21:49 04/07/09 (0)
            In Reply to: RE: One more question posted by Charles Hansen on March 29, 2009 at 11:20:20

            Thanks for the info.
            
            

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