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

Wed Jun 19 17:52:06 UTC 2013

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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>> --
>> Sent from my Motorola Droid Razr 4G LTE wireless tracker while I do
>> other
>> things.
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>
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