[time-nuts] [OT} audiophile outlets.....

Wed Jun 19 17:14:17 EDT 2013

Rb or Cs locked 50/60 Hz AC power might still be an available niche
although I didn't do much of a search.
Alan

On Wed, Jun 19, 2013 at 11:52 AM, J. Forster <jfor at quikus.com> wrote:

> How about a Rb or Cs standard to control the sampling rate of the DACs in
> your CD player so you always have perfect pitch and no wow or flutter?
>
> Oh, it's already being done and sold to Audiophools....  never mind!
>
> -John
>
> ================
>
>
> > Simple, just think of the next snake oil.  There's always more.
> >
> >
> > On 6/18/2013 10:33 PM, Brian, WA1ZMS wrote:
> >> What's gets me is that I didn't think of this snake oil first.
> >> Had I thought of it first I could own a PTI H-MASER by now.   :- )
> >>
> >> -Brian, WA1ZMS
> >>
> >> -----Original Message-----
> >> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> >> Behalf Of Didier Juges
> >> Sent: Tuesday, June 18, 2013 10:01 PM
> >> To: nerd at verizon.net; Discussion of precise time and frequency
> >> measurement
> >> Subject: Re: [time-nuts] HP and other equipment failure
> >>
> >> "audiophile outlets"
> >>
> >> You've got to be kidding but not even.
> >>
> >> At least, nobody is forcing anybody to buy them...
> >>
> >> Didier
> >>
> >> Peter Gottlieb <nerd at verizon.net> wrote:
> >>
> >>> The current distortion from simple transformer-rectifier-capacitor
> >>> power supplies contains a lot of third harmonic content.  In a 3 phase
> >>> system (as are all distribution systems for commercial and industrial)
> >>> the third harmonic ADDS in the neutral, or creates circulating currents
> >>> in a delta configuration.  These currents, as you mention, can get very
> >>> large and were the cause of many
> >>>
> >>> transformer explosions in cities as these power supplies became common.
> >>> The
> >>> transformer designs had to be improved, but the PFC supplies make a big
> >>> difference.
> >>>
> >>> How many of you have looked at the power line waveform, especially in
> >>> an industrial or commercial area?  Doesn't look much like a sine wave,
> >>> does it?  So it's pretty funny to see audiophile outlets
> >>> (http://www.dedicatedaudio.com/power_outlets).
> >>>
> >>> Peter
> >>>
> >>>
> >>>
> >>>
> >>> On 6/15/2013 6:56 PM, stan, W1LE wrote:
> >>>> PFC to me is power factor correction, not only the classical power
> >>> factor to
> >>>> minimize (VAR) volt-amp reactive component,  but also to remove the
> >>>> harmonic load  current imposd on the
> >>> electrical power
> >>>> system.
> >>>> A '90's onward technique. in th 80's and 90's without the harmonic
> >>> load
> >>>> current reduction and having
> >>>>   a few 100 end items of equipment, each withtheir own  a switch mode
> >>> power
> >>>> supplly,
> >>>>   it was not uncommon to find hundreds of amps of the third harmonc on
> >>> neutra,
> >>>>    in the electrical power distribution system.
> >>>>
> >>>> Could be a serious EMC problem if you were dealing with voice grade
> >>> channels.
> >>>> And people safety issues.
> >>>>
> >>>> Stan, W1LE   Cape Cod
> >>>>
> >>>>
> >>>>
> >>>> On 15-Jun-13 5:52 PM, J. L. Trantham wrote:
> >>>>> Sorry for the interruption but what is 'PFC'?
> >>>>>
> >>>>> Thanks.
> >>>>>
> >>>>> Joe
> >>>>>
> >>>>> -----Original Message-----
> >>>>> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]
> >>> On
> >>>>> Behalf Of Poul-Henning Kamp
> >>>>> Sent: Saturday, June 15, 2013 4:09 PM
> >>>>> To: Robert Atkinson; Discussion of precise time and frequency
> >>> measurement
> >>>>> Cc: Perry Sandeen
> >>>>> Subject: Re: [time-nuts] HP and other equipment failure
> >>>>>
> >>>>> In message
> >>> <1371329221.83869.YahooMailNeo at web171902.mail.ir2.yahoo.com>,
> >>>>> Robert  Atkinson writes:
> >>>>>
> >>>>>> While I agree with everything else you say, you CAN have too much
> >>>>>> filter capacitance. At least where dc rectifier / filter
> >>> (smoothing)
> >>>>>> circuits are concerned. Increasing C causes increased ripple
> >>> current
> >>>>>> [...]
> >>>>> And ripple current can be a major source of power-line frequency
> >>> noise in
> >>>>> all electronics.
> >>>>>
> >>>>> The main reason why switchmode power-supplies today (can) outperform
> >>> linear
> >>>>> power supplies with respect to noise, is because the legally
> >>> mandated PFC
> >>>>> correction eliminates the bridge-rectifier ripple harmonics.
> >>>>>
> >>>>> I would not hessitate to use a good quality switchmode to replace
> >>> the linear
> >>>>> supply in a HP5370B.
> >>>>>
> >>>>> I did some experiments a couple of years ago, with an
> >>> audio-amplifier:
> >>>>> I put a standard PFC corrector chip on the secondary side of the
> >>> trafo.
> >>>>> The overall result was not satisfactory, but the 50 Hz "sneer"
> >>>>> we all know and hate was absent, and the "Tzoing!!!!!" power-on
> >>> mechanical
> >>>>> shock from the trafo was also eliminated, as was the consequent
> >>> dimming of
> >>>>> the lights ;-)
> >>>>>
> >>>>> The main reason not to do this, is that you need some physically
> >>> gargantuan
> >>>>> coils for a 10A+ PFC-switcher.
> >>>>>
> >>>>>
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> >> other
> >> things.
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