Tweakers' Asylum

• Re: OpAmp tweak for 67SE -- THANKS! - JoA 15:56:42 03/15/04 (0)
  In Reply to: OpAmp tweak for 67SE posted by JoA on March 11, 2004 at 02:20:56:

  .
  
  

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• Re: OpAmp tweak for 67SE - Zombie 07:51:10 03/12/04 (0)
  In Reply to: OpAmp tweak for 67SE posted by JoA on March 11, 2004 at 02:20:56:

  Hello!
  Although OPA627 is a single, I warmly recommend it.
  I have used OPA2604 and 2134 before, but will never turn back.
  
  

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• Re: OpAmp tweak for 67SE - Werner 07:29:54 03/11/04 (3)
  In Reply to: OpAmp tweak for 67SE posted by JoA on March 11, 2004 at 02:20:56:

  AD8620 and 8066 can only be used with supply voltages less than +/-13V. Maybe the CD67 exceeds this.

  I would look into the AD826, which has a degenerated input pair and fairly high open-loop bandwidth. It is quite easy to use and behaves well in the presence of fast digital signals.
  
  
  

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  • Re: about AD826 - Glenn2 03:53:42 03/12/04 (2)
    In Reply to: Re: OpAmp tweak for 67SE posted by Werner on March 11, 2004 at 07:29:54:

    I can confirm that this chip works well in the CD-67SE.

    The AD825 modules (I made my own using Brown Dog adaptors) also work well and are slightly more musical. The AD826 is a bit brighter so it may just come down to system matching.

    I also made AD8065 modules (2xAD8065 = AD8066) and these sounded nice - maybe the best in terms of high frequencies, but slightly less interesting than the AD825 which seems to be a bit punchier.

    In terms of resolution, dynamics and overal clarity, the LM6172 is probably the winner, but it just sounds a bit too forward for long-term satisfaction.

    The voltage applied to the op-amps is +12V/-12V so you CAN use the AD8066 without worry (remember it is surface mount though). Same goes for AD8610 (single) and AD8620 (dual).

    If you just want to put in sockets and try some 8-pin dip op-amps without messing with surface-mount op-amps and modules, get some free samples of the AD826 from www.analog.com (I think) and some OPA2604 from the TI website. You might as well get some OP275 (AD) and OPA2132, OPA2134 whilst you are there just in case you prefer those.

    The AD826 takes a long time to burn in and stop sounding agressive - bear this in mind.

    Hope this helps,
    Glenn

    
    
    

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    • Re: about AD826 - Lix 19:16:35 03/15/04 (1)
      In Reply to: Re: about AD826 posted by Glenn2 on March 12, 2004 at 03:53:42:

      Forgive my ignorance but am no techie person to determine whether OPA2604 is a drop-in replacement for njm2114?

      What is the corresponding package type?
      
      

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      • Re: about AD826 - Glenn2 02:32:59 03/16/04 (0)
        In Reply to: Re: about AD826 posted by Lix on March 15, 2004 at 19:16:35:

        If it is the 8-pin DIP type (i.e., with legs that go through the board, NOT surface mount SOIC) the package types are

        OPA2604AP
        AD826AN
        
        

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