Tube DIY Asylum

• RE: Details of modification - Vatron 10:17:30 07/19/07 (3)
  In Reply to: RE: Details of modification posted by mikeyb on July 18, 2007 at 10:23:17

  Hi mikeyb,

  I have received a few e-mails from Jeff Medwin regarding your simulations. Here are a few questions resulting from those emails.

  "Are you measuring the correct thing ??

  Will you simulate the dynamic response of these new and
  old supplies please?? "....

  That will nullify ALL his year's worth of BS, and is a NICE post, needed in the mix:

  Respectfully submitted

  Norris Wilson
  
  
  

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  Edits: 07/19/07
  • Yes, eventually - mikeyb 11:09:38 07/19/07 (2)
    In Reply to: RE: Details of modification posted by Vatron on July 19, 2007 at 10:17:30

    "Are you measuring the correct thing ??"
    
    That is, indeed, a good question. What PSUD2 allows you to simulate is an essentially instantaneous change in current draw from x to y. Is this realistic? Probably not. What is does reveal, however, is the power supplies response to transient signal. What you want is a ‘smooth’ response, with no ‘ringing’. We are looking at the response in the ‘time domain’, that is, a plot of output voltage versus time. Both versions of the power supply behave well on that account.
    
    That said, what would be more helpful would be to look at the supplies response to a typical audio waveform, which (I would guess) consists of both transient and sinusoidal changes in current. You should also look at the supplies frequency response. You can’t do that with the PSUD2 simulator, but you can with PSPICE. It takes time and effort, but it could be done.
    
    I’ll get around to it eventually, to satisfy my own curiosity and to hopeful end this continuing fight (debate). Yea, right.
    
    
    

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    • Eventually was 09-2007 - drlowmu 20:40:37 10/01/07 (0)
      In Reply to: RE: Yes, eventually posted by mikeyb on July 19, 2007 at 11:09:38

      http://www.audioasylum.com/forums/tubediy/messages/12/128000.html
      
      

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    • RE: Yes, eventually - Vatron 05:48:47 07/20/07 (0)
      In Reply to: RE: Yes, eventually posted by mikeyb on July 19, 2007 at 11:09:38

      Thanks mikeyb,
      
      I am looking forward to your PSPICE simulations.
      
      I hope that it will offer conclusive evidence of the physics behind Jeff's power supply design, finally ending the negative part of the discussion.
      
      Norris Wilson
      
      

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