Computer Audio Asylum

• RE: This is the same post on Audiogon. - kana813 18:06:57 10/07/07 (2)
  In Reply to: RE: This is the same post on Audiogon. posted by cics on October 07, 2007 at 15:46:21

  See response at Audiogon thread.
  
  
  
  
  
  

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  • A look into HDD noise pollution - cics 13:09:35 10/08/07 (1)
    In Reply to: RE: This is the same post on Audiogon. posted by kana813 on October 07, 2007 at 18:06:57

    These measurements were taken a few weeks ago.
    
    To understand impact of HDD power interference, I used my DVD Computer (which I consider to be a dirty environment). This computer uses 2 standard SATA desktop drives which impacts both 5V & 12V lines. Measurements are done using Elab-80 DSO at 80MHz. Dynamic range is 48db (8 bits).
    
    Scenarios tested:
    
    1. Machine at idle
    2. 500GB HDD spins down whilst remaining HDD continues
    3. Same 500GB HDD removed whilst remaining HDD continues
    
    Both 5V & 12V lines measured. Computer remains idle in all measures. Measures were repeated.
    
    Left diagram shows ripple noise with spectral view on right. Both 5V and 12V lines show healthy reductions in interference. I plan to do similar measurements on my Computer Transport with and without VP-9101P.
    
    ----------------------------- 5 Volt line -----------------------------
    
    5V @ idle (both HDDs spinning)
    
    

    
    
    

    
    
    5V @ idle & 500GB HDD spinned down (i.e. no motor activity)
    
    

    
    
    

    
    
    5V @ idle & No 500GB HDD (physically disconnected)
    
    

    
    
    

    
    
    ----------------------------- 12 Volt line -----------------------------
    
    12V @ idle
    
    

    
    
    

    
    
    12V @ idle & 500GB HDD spinned down
    
    

    
    
    

    
    
    12V @ idle & No 500GB HDD (physically disconnected)
    
    

    
    
    

    
    
    
    

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    • RE: A look into HDD noise pollution - kana4813 23:09:19 10/08/07 (0)
      In Reply to: RE: A look into HDD noise pollution posted by cics on October 08, 2007 at 13:09:35

      You don't need VP-9101Ps to clean this up, just put a 470-1200uf cap across the 5V rail at the HDD end of the connection.
      
      Try some Rubycon ZA,ZL or ZLGs.
      
      

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