Tweakers' Asylum

• All of us! - clifff 10:55:59 03/20/08 (5)
  In Reply to: RE: Whose responsible, if anyone, for this happening? nt posted by Norm on March 20, 2008 at 09:44:17

  All power lines have impedance.
  
  Use any kind of load which is non linear, ie Xformer and Reservoir C which pulls current in short heavy spikes (they all do) plus all those AC chopping SCR controlled supplies, fleurescent tubes etc etc and the average mains waveform ends up being a mess.
  
  DC I am not sure about.
  
  

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  • Rectified line voltage results in "DC" - Al Sekela 16:28:26 03/20/08 (1)
    In Reply to: RE: All of us! posted by clifff on March 20, 2008 at 10:55:59

    Consider the typical personal hair dryer. It has a 'half-power' switch that causes the current to flow through a rectifier diode. Since only one side of the AC sine wave causes current to flow, there is a net DC voltage created on the neutral wire due to the wire resistance. Any other circuit fed from the same utility transformer will see some DC voltage from this offset.
    
    My power amp toroidal transformers hum loudly for a few moments every week-day morning. Shortly thereafter my neighbor leaves for work. It took me a while to figure this out.
    
    

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    • Ah! They don't do that in the UK! nt - clifff 01:27:29 03/21/08 (0)
      In Reply to: RE: Rectified line voltage results in "DC" posted by Al Sekela on March 20, 2008 at 16:28:26

      
      
      

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  • So why more in some cities? nt - Norm 14:29:13 03/20/08 (2)
    In Reply to: RE: All of us! posted by clifff on March 20, 2008 at 10:55:59

    a
    
    

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    • Norm here is a link to a great article by Mr. Hansen....... - jea48 15:27:32 03/20/08 (1)
      In Reply to: RE: So why more in some cities? nt posted by Norm on March 20, 2008 at 14:29:13

      > > > .
      

      • Link   (Open in New Window)

      
      

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      • Thanks, it make you surprised that anything sounds good. nt - Norm 20:49:53 03/20/08 (0)
        In Reply to: RE: Norm here is a link to a great article by Mr. Hansen....... posted by jea48 on March 20, 2008 at 15:27:32

        a
        
        

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