John Curl's Blowtorch preamplifier part II - Page 3526 - diyAudio
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Old 17th February 2013, 03:38 PM   #35251
RNMarsh is offline RNMarsh  United States
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I referenced Henry Ott decades ago in an article I published. A great overview source book.
A more thorough and detailed source on EMI/RFI used by industry are the series of volumes put out by (they do on-site training - I've attended) Don White and Assoc. The 'bible' standard for 50 years.

Thx-RNMarsh

Last edited by RNMarsh; 17th February 2013 at 03:48 PM.
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Old 17th February 2013, 03:43 PM   #35252
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Doesn't everybody know Henry Ott's books, etc?
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Old 17th February 2013, 03:47 PM   #35253
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Don't forget Ralph Morrison, when it comes to grounding and shielding.
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Old 17th February 2013, 04:00 PM   #35254
DF96 is offline DF96  England
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Quote:
Originally Posted by Max Headroom
Perhaps this subject should be given it's own thread, however since there are so many high calibre participants here I pose the question...
What are the deep implications and effects of the likes of 1/f noise and Brownian noise in typical audio stages/sytems, and additionally in RF reciever stages and systems.
In audio systems 1/f can be the dominant noise.

In RF systems it can usually be ignored, with two exceptions:
- oscillators
- GaAsFETs, which have an unusually high 1/f corner frequency so unlike most RF devices get more noisy at lower frequencies so not much point in using them below UHF
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Old 17th February 2013, 04:21 PM   #35255
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Quote:
Originally Posted by fas42 View Post
getting good sound every time is the ultimate goal
Insisting so much on this point, it seems that you really have a problem. Apart electronic slight differences due to temperature stabilization, and acoustic ones due to humidity, air pressure changes, or people in the room, i can't imagine my system to sound different one day from an other. And all those effects does-not deeply affect the body of the reproduced music.

Some part is oscillating, or at the limit ? The whole system cabling is asymmetrical, and not cabled in an optimized way with correct cables (a good practice: twisted shielded pair with earth not connected at the input), sens of the AC plugs not chosen for the minimum AC leakage ? A poor contact somewhere (yes it happens) ? Are-you leaving near a big radio emitter or your AC power heavily contaminated or insufficient ?
Or is-it some audiophile disease, listening to your system instead of the music, trying to find problems ?

One way to ensure you are free from this last very dangerous disease is to look at your system, Dr House way:
Any special suspension or golden cones on solid-state pure electronic devices ? Any exotic audiophile cables around ? Any mysterious devices like the Bybee stuff, a color layer applied with a pen at the edge of the CDs ? Any audiophile reviews in your library ?
If you only have one of these symptoms, it can still be cured. If more than one, you're doomed.

Quote:
Originally Posted by john curl View Post
Doesn't everybody know Henry Ott's books, etc?
I do not. But i have a hole between Steinbeck and Hemingway in my library.
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Last edited by Esperado; 17th February 2013 at 04:32 PM.
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Old 17th February 2013, 04:32 PM   #35256
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Hang in there, fas42. I'm with you on this. Bybee? Who cares? Colored pens, why not?
'-)
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Old 17th February 2013, 05:00 PM   #35257
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Quote:
Originally Posted by john curl View Post
Doesn't everybody know Henry Ott's books, etc?
You mean Wong + Ott?
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Old 17th February 2013, 05:11 PM   #35258
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I studied their book "Function circuits" for my thesis, long time ago. I still have a copy somewhere.
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Old 17th February 2013, 05:33 PM   #35259
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Quote:
Originally Posted by john curl View Post
Colored pens, why not?
Yes, when you read a cd, you water the disk with photons. Some of them bounces on the imperfections of the surface. Then, After several bounces, they flow away on the transparent edge. There is musical details inside which are lost. Darkening the edge of the record will keep them inside, so you don't lose musical details. Of course the color of the pen has to be harmonious with the one of the laser. If not, there is a risk for even harmonics. That is because there are distorted photons inside too. The right color filter the good ones from the bad ones, Bybee style.
Too there is light that leak from outside because the CD player is not totally lightproof. They can enter the CD by the edges. The dark edges prevent this.

John, you are a mystery for the science. How can-you survive with such a level of those audiophile diseases and continue to apply the Ohm's law in a correct way ?
Yoruba, leaves this body!
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Last edited by Esperado; 17th February 2013 at 05:44 PM.
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Old 17th February 2013, 05:42 PM   #35260
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I have never tried the colored pen on CD's. Too lazy. Besides, I think that CD's are mostly lousy from the start. Give me SACD or DVD24/96 any time!
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