[Amps] Filter Capacitors

[B Osburn]

For what it's worth the PSU Designer II program at Duncan's Amps shows it when you do a simulation.  I just scaled back the voltage by a factor of 10 to "fit" in his program.  Going to a Pi section really makes a difference.  

http://www.duncanamps.com/software.html<http://www.duncanamps.com/software.html>

Brad AB0YD  
  ----- Original Message ----- 
  From: Rob Atkinson<mailto:ranchorobbo at gmail.com> 
  To: Carl<mailto:km1h at jeremy.mv.com> 
  Cc: amps at contesting.com<mailto:amps at contesting.com> 
  Sent: Saturday, April 14, 2012 8:22 PM
  Subject: Re: [Amps] Filter Capacitors


  Okay thanks--I didn't look far enough back in time.  I'll go into the
  '30s handbooks.  tnx

  Rob
  K5UJ

  On Sat, Apr 14, 2012 at 7:44 PM, Carl <km1h at jeremy.mv.com<mailto:km1h at jeremy.mv.com>> wrote:
  > In the 30's when the mercury vapor tubes came along. I have QST complete
  > from 1926 to present plus most ARRL and the "other" HB and read thru the
  > oldies about 10 years ago after having them in storage since the 70's or so.
  >
  > Your buddy Don has commented a few times also when he isnt on one of his OWL
  > kicks (-;
  >
  >
  > Carl
  > KM1H
  >
  >
  >
  > ----- Original Message ----- From: "Rob Atkinson" <ranchorobbo at gmail.com<mailto:ranchorobbo at gmail.com>>
  > To: "Carl" <km1h at jeremy.mv.com<mailto:km1h at jeremy.mv.com>>
  > Cc: "Roger (K8RI)" <k8ri at rogerhalstead.com<mailto:k8ri at rogerhalstead.com>>; <amps at contesting.com<mailto:amps at contesting.com>>
  > Sent: Saturday, April 14, 2012 6:19 PM
  >
  > Subject: Re: [Amps] Filter Capacitors
  >
  >
  >> I'm trying to find out more about this but so far have only found
  >> instruction on avoiding ripple frequency resonance with a choke input
  >> filter. What were the old handbooks you looked at? I was looking at
  >> the '51 ARRL handbook. Thanks,
  >>
  >> 73
  >>
  >> Rob
  >> K5UJ
  >>
  >> On Fri, Apr 13, 2012 at 9:40 AM, Carl <km1h at jeremy.mv.com<mailto:km1h at jeremy.mv.com>> wrote:
  >>>
  >>> A choke is not a good idea unless great care is taken to
  >>> eliminate/minimize
  >>> the switching spike which is present with tube and SS rectifiers. A scope
  >>> is
  >>> mandatory especially if the choke and caps are not well overated for
  >>> voltage.
  >>>
  >>> For decades this spike has been mostly ignored in literature and finally
  >>> saw
  >>> daylight again when more boatanchor amps were being built and then the
  >>> audio
  >>> types got involved and developed their own versions of reality.
  >>>
  >>> I first noticed it about 10 years ago when checking ripple in a 2700V PS
  >>> and
  >>> had to dig into the old handbooks and QST's and saw the "ancients" knew
  >>> all
  >>> about it. I hadnt built a choke input supply since the late 50's and that
  >>> was simply using WW2 surplus from a BC-610 so obviously the design work
  >>> was
  >>> already done.
  >>>
  >>> Carl
  >>> KM1H
  >>>
  >>
  >>
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