Computer Audio Asylum

• I did desolder it. But the TTi linear PSU is still powering it right now - hfavandepas 02:36:53 09/05/11 (6)
  In Reply to: RE: Improving Hybrid Power Supply through filtering with coupled inductors. posted by smicyta on September 05, 2011 at 01:43:54

  Hi smicyta
  
  I wanted too replace it with a shunt regulator from makes like: Newclassd (the dexa regulator) or from my country fellow man Guido Tent (a Tentlabs Shunt regulator).
  
  Since shipping from Denmark (only 750 kilometers from Rotterdam) would cost 27 euro’s and shipping from Eindhoven (75 kilometers) would cost € 4,70. I choose the Tentlabs Shunt regulator.
  

  Van on filtering, de-coupling, demping, ect

  
  
  But I could not get it too work. The Julia digital part however works when I power it with my TTi linear PSU. Than I saw that the Juli@ digital part uses 113 mA in my setup.
  But being an amateur, I did not check the specs very well before I ordered the Tentlab shunt regulator.
  When I connected the shunt regulator too the Juli@ digital part, the shunt regulator did not produce more than 2.3 volts. No matter how I tried. When not connected too the Juli@ digital part, it nicely produces 3.3 volt.
  Only after I did read again the specs, I discovered that the Tentlab Shunt regulator can only provide 100mA. So I guess that is might be the reason that the regulator will not output 3.3 V but 2.3 volt.
  So right now the bulky and monstrous TTi is still powering the Juli@. But too keep the peace at home, I have too come up with a solution very fast.
  
  So I ordered an IC LT 1086 CT3,3 3,3V POS VR 1,5A T regulator.
  My soldering skills are improving. And I also have less fear messing things up. I’m planning too construct my own DIY regulator. I want too feed it with filtered 5 volt DC from the Pico and than feed the resulting 3.3 V too the Juli@ digital part. Everything filtered as much as possible. See how that will sound.
  
  Mark
  
  fully optimized cMP2 PC -> ESI Juli@ -> Van den Hul Optocoupler MkII-> Lavry Black DA10 -> XLR Mogami Gold -> Klein & Hummel O300
  
  

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  • RE: I did desolder it. But the TTi linear PSU is still powering it right now - smicyta 23:53:24 09/07/11 (5)
    In Reply to: RE: I did desolder it. But the TTi linear PSU is still powering it right now posted by hfavandepas on September 05, 2011 at 02:36:53

    Hi Mark
    
    I am currently feeding the Juli@ with a 5V Belleson regulated supply to Pin 2 & 4 of J1. There is some improvement over an off the shelf linear supply.
    
    I am thinking of bypassing U1 and use a Belleson 3.3V 0.5A regulator for a direct 3.3V feed similar to what you are doing. Just wondering if this is worth doing?
    
    Warm Regards
    

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    • Definitely worth doing. But you also have too remove noisy (power) sources. - hfavandepas 01:48:36 09/08/11 (4)
      In Reply to: RE: I did desolder it. But the TTi linear PSU is still powering it right now posted by smicyta on September 07, 2011 at 23:53:24

      Hi Smicyta,

      As also reported by other inmates removing the LT1117 regulator and directly powering the digital part of the Juli@ with 3,3 Volt DC low noise power, it is one of the tweaks/modifications with biggest positive effect on sound quality.
      Also in my cMP setup this is the one with biggest impact SQ, compared too al previous power supply changes/modification/tweaks I did.
      - ‘smoothing’ caps on the P4 coming from an ATX PSU
      - a linear on the P4
      - a Pico 160 XT on the P24
      - replacing the HDD for an SSD
      - various filters on P4 & P24
      - various filters on in- & outputs of the linear PSU’s and in- & outputs of the Pico 160 XT.

      Yesterday I did my first electronic construction and soldering project ever! I constructed a simple voltage regulator based on the LT 1086 CT3,3 3,3V POS VR 1,5A T regulator. It turned out too be not being so hard at all.
      Since I like too experiment with filters before and after I again used P4 connectors, so that I can easily swap filters in and out before and after the regulator. Don’t be fooled by the yellow colour of the wires. There is only 5 Volt DC on the input too the regulator. The regulator needs 5 Volt DC input and gives 3,3 Volt output.

      Van on filtering, de-coupling, demping, ect

      I’m not completely surprised that there only was 'some' sound quality improvement in your setup. The noisy elemets in the power supply are still present. You also need too remove the noise sources that produce noise so that noise levels drop as much as possible.

      Right now I’min the process of evaluating various home made filters before and after my home made LT 1086 CT3,3 regulator and also what PSU I need for powering the input.

      Van on filtering, de-coupling, demping, ect

      With adequate filtering is it perfectly possible too power the regulator with 5 Volt DC coming from the Pico 160 XT.
      Best results so far I get with:
      * regulator input: filtering the 5 Volt Pico output with the filter shown in the left lower corner
      (a 230 AC filter with 40 mH ferrite cokes inside + caps added)
      * regulator output: the simple TDK common mode filter for data transmission lines at the right corner.

      So do try too clean the power of the Juli@ digital part by providing low noise power but also by removing noisy power sources. Mixing low noise power sources with high noise power sources is obviously giving less noise reduction, thus less sound quality improvement.

      Mark
      
      fully optimized cMP2 PC -> ESI Juli@ -> Van den Hul Optocoupler MkII-> Lavry Black DA10 -> XLR Mogami Gold -> Klein & Hummel O300
      
      

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      Edits: 09/08/11

      • RE: Definitely worth doing. But you also have too remove noisy (power) sources. - smicyta 21:22:48 09/13/11 (0)
        In Reply to: RE: Definitely worth doing. But you also have too remove noisy (power) sources. posted by hfavandepas on September 08, 2011 at 01:48:36

        Hi Mark
        
        I do agree with you that a clean power supply is imperative for excellent SQ with a computer based transport.
        
        I really admire your enthusiasm in all those filtering works to clean up the power supply.
        
        Let me digest what you had done so far and see if I replicate what you are doing.
        
        BTW, what wire size do you used from the Juli@ Output & GND of the removed U1?
        
        Warm Regards
        

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      • RE: Definitely worth doing. But you also have too remove noisy (power) sources. - theob 05:00:49 09/08/11 (2)
        In Reply to: RE: Definitely worth doing. But you also have too remove noisy (power) sources. posted by hfavandepas on September 08, 2011 at 01:48:36

        Mark: in your comment '...regulator output: the simple TDK common mode filter for data transmission lines at the right corner...' what is the part number of the tdk filter you use?
        

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        • ZJYS51R5-2PT-01 - hfavandepas 08:12:33 09/08/11 (1)
          In Reply to: RE: Definitely worth doing. But you also have too remove noisy (power) sources. posted by theob on September 08, 2011 at 05:00:49

          Hi Theo
          
          The part number for the TDK common mode filters for data transmission lines = ZJYS51R5-2PT-01
          
          But probably there are better solutions out there.
          I didn’t do any research yet on if there are alternative common mode filters that better suite the purpose for which I use them (coupled inductors in a filter).
          I’m almost sure there are better coupled inductors for this purpose.
          I didn’t yet spend some time on research
          
          Until now I just did some experiments with various types of filters too get some first impressions on what effect filtering would have on sound quality in a cMP setup with hybrid PSU situation.
          
          But from these first impressions I conclude filtering definitely should be done in a hybrid PSU situation.
          (linear on P4 & Pico 160 XT on P24 & SSD).
          It gives a very nice step up in sound quality.
          
          Since I now know that filtering the output of mass produced linear bench PSU’s filtering the input & output of the Pico 160 XT is very rewarding, the next thing too find out is: which filter types have best combination of: ease of construction, costs and effect on SQ. And also too find the construction parts that best fit the job.
          
          Mark
          
          fully optimized cMP2 PC -> ESI Juli@ -> Van den Hul Optocoupler MkII-> Lavry Black DA10 -> XLR Mogami Gold -> Klein & Hummel O300
          

          • brochure ZJYS51R5-2PT-01   (Open in New Window)

          
          

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          • RE: ZJYS51R5-2PT-01 - theob 08:43:30 09/08/11 (0)
            In Reply to: RE: ZJYS51R5-2PT-01 posted by hfavandepas on September 08, 2011 at 08:12:33

            Thanks Mark
            

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