Tweakers' Asylum

Posted by Mike B. (M) on November 06, 2009 at 09:47:02

In Reply to: RE: Can anyone explain how an improvement in a wallwart used in charging a cable can so greatly affect sound? posted by Norm on November 06, 2009 at 06:24:33

Less switching noise and better filtering. Evidently that noise can be transmitted from the shield to the conductors? This could be a good warning for others using wall wort power supplies

• Switching noise with a wall wart? nt - Norm 19:51:02 11/06/09 (5)
  In Reply to: RE: Can anyone explain how an improvement in a wallwart used in charging a cable can so greatly affect sound? posted by Mike B. on November 06, 2009 at 09:47:02

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  • RE: Switching noise with a wall wart? - Mike B. 21:03:47 11/06/09 (4)
    In Reply to: RE: Switching noise with a wall wart? nt posted by Norm on November 06, 2009 at 19:51:02

    There will be a rectifier setup that converts AC to DC. Probably cheap diodes or a bridge that have a lot of noise. A good quiet power supply might have high quality diodes, filtering, one or more regulators that help absorb noise. If you want to discuss active shields contact Damien Martin. He holds the patent. He shows up at DIYaudio as audio1
    

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    • They do replace parts. I guess I should say I "knew" Damien years ago. nt - Norm 14:47:51 11/07/09 (1)
      In Reply to: RE: Switching noise with a wall wart? posted by Mike B. on November 06, 2009 at 21:03:47

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      • RE: They do replace parts. I guess I should say I "knew" Damien years ago. nt - Mike B. 18:32:23 11/07/09 (0)
        In Reply to: RE: They do replace parts. I guess I should say I "knew" Damien years ago. nt posted by Norm on November 07, 2009 at 14:47:51

        I figured that since you have attended many shows you probably had crossed paths. He develops products and freelances for a variety of companies.
        

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    • RE: Switching noise with a wall wart? - crossram2x4@aol.com 07:02:28 11/07/09 (1)
      In Reply to: RE: Switching noise with a wall wart? posted by Mike B. on November 06, 2009 at 21:03:47

      "If you want to discuss active shields contact Damien Martin. He holds the patent. He shows up at DIYaudio as audio1"
      
      I can't seem to find this. Can you help steer me to Damien's posts (a link maybe)?
      
      
      Thanks.
      
      

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      • RE: Switching noise with a wall wart? - Mike B. 07:55:53 11/07/09 (0)
        In Reply to: RE: Switching noise with a wall wart? posted by crossram2x4@aol.com on November 07, 2009 at 07:02:28

        I have linked to a page of a thread at DIYaudio with a post from him. You can use the internal PM system to make contact. This particular thread discusses low noise power supplies starting several pages ahead of what I have linked. John Curl is known for very quiet circuit design.

        • audio1   (Open in New Window)

        
        

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