• No, I mean the power transformer. (nt). - akltam 05:33:26 12/27/04 (6)
  In Reply to: Re: Anyone compare the DAC with a bigger size Transformer ? (nt) posted by KevinC on December 27, 2004 at 04:26:59:

  .
  
  

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  • Re: No, I mean the power transformer. (nt). - Dave Davenport 05:57:14 12/27/04 (5)
    In Reply to: No, I mean the power transformer. (nt). posted by akltam on December 27, 2004 at 05:33:26:

    Hi Akltam,

    The power supply provided for use with the passive output uses a small Telma transformer. The power supply for use with the active output uses a much larger Lundahl LL1683.

    I have used both power supplies in combinations with both the active and passive outputs and the power supplies sound the same to me.

    Dave
    
    

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    • Yes I have...almost - Bas Horneman 09:01:59 12/27/04 (4)
      In Reply to: Re: No, I mean the power transformer. (nt). posted by Dave Davenport on December 27, 2004 at 05:57:14:

      I first used battery, then tried a massive toroidal with LCRCRC filtering...can't say I heard an improvement. Then I tried something like this...http://www.tnt-audio.com/clinica/regulators2_impedance2_e.html

      which was the best sounding. I am now thinking of getting a smaller transformer since with the current source...what is the point?
      To infinity and beyond!!!
      
      

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      • I found some answers - Francois G 13:53:02 12/28/04 (0)
        In Reply to: Yes I have...almost posted by Bas Horneman on December 27, 2004 at 09:01:59:

        I read the whole article referenced and found that I1 and I3 are used for simulation purposes and "are frequency-dependent current sources, forcing a current sweep of 1 Ampere from 1Hz up to 1MHz".

        Francois
        
        

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      • Bas, some questions for you - Francois G 11:32:17 12/27/04 (2)
        In Reply to: Yes I have...almost posted by Bas Horneman on December 27, 2004 at 09:01:59:

        Very interesting that you prefer the shunt regulator 12V supply to the DAC, given the fact that the RAKK DAC seems to have several on-board regulators. I'm putting together a power supply (regulator) for my DAC right now and hope to gain from your experiments.

        I looked at the web page and hope you could help with it. I was not sure (first schematic) what was meant by I1 AC 1 0. In the enhanced schematic it was called I3 AC 1m0. Likewise the value of the resistor (R13) preceeding the C1 in first fig seems to be 70 meg, but surely then C1 has little effect. Any other advice will be welcome.

        Vrystaaat!

        Groete,
        Francois
        
        

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        • Francois, hopefully the answer you need! - Bas Horneman 13:54:58 12/28/04 (1)
          In Reply to: Bas, some questions for you posted by Francois G on December 27, 2004 at 11:32:17:

          Hi Francois,

          Here is my setup...sort of a scaled down version of the first diagram...
          the I1 is your load...ie your dac or whatever..

          So here is what it looks like...really a text book circuit...

          After the rectifier...and before I2 you have a cap (try different values and types for best sound)
          then use a CCS such as LM1085 or the humble LT317 set for the current draw of your circuit plus 20-30mA extra

          Then set the TL431 for the voltage you need by the dividing network (see datasheet of the 431)

          The cap c2 lowers impedance but posts over at diyaudio say it sounds worse than not having it in there...( i did not experiment and simply
          left it out)

          after the tl431 simply find a cap that sounds good for you I have a 1500uF cap with a little 4,5uF to bypass...
          and that is it really

          Haak Vrijstaat....Haak!!

          Cheers,
          Bas
          
          To infinity and beyond!!!
          
          

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          • Just what I needed! Thanks (nt) - Francois G 08:25:32 12/29/04 (0)
            In Reply to: Francois, hopefully the answer you need! posted by Bas Horneman on December 28, 2004 at 13:54:58:

            
            
            

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