John Curl's Blowtorch preamplifier part II - Page 3540 - diyAudio
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Old 18th February 2013, 09:03 PM   #35391
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Richard I will have to find the schematic. It was in the Gootee thread on capacitor size requirements for a power supply. It was an attempt to balance the separate winding in a center taped winding I think, but I may be incorrect and it was two separate windings without a center tap. So I will have to look and see what I can find of the circuit.
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Old 18th February 2013, 09:13 PM   #35392
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Quote:
Originally Posted by SY View Post
Go for it, I'm a big boy.
Well, your and Dave's thesis is that 1/f noise is the dominant source of noise in audio, and I explained in #35359 why I don't hold that to be true, based on what I saw in measurements and understand from theory. Why don't you engage in a substantial debate on this point? Wine and cheap shots at the usual suspect appear to be always fun for some, but let's dig into a real issue a bit deeper.
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Old 18th February 2013, 09:14 PM   #35393
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Another 'scientific article' (out of many)
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Old 18th February 2013, 09:15 PM   #35394
fas42 is offline fas42  Australia
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I thought one of the basics of all sensory science, including audio, is that senses (and hence experience) are not to be fully trusted. They can easily be fooled. Therefore personal experience is about the worst possible way of learning in this area. It almost guarantees misconception and failure.
The complication in all this is that audio is a game where you are attempting to fool the senses. Otherwise, all you would ever hear are speaker drivers being exercised. Aiming for an absolute of performance may be an excellent tool for getting closer to the goal, but can never verify that the goal has been reached ...

Frank
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Old 18th February 2013, 09:15 PM   #35395
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2nd try
Attached Images
File Type: jpg wine1.jpg (603.2 KB, 99 views)
File Type: jpg wine2.jpg (812.6 KB, 97 views)
File Type: jpg wine3.jpg (366.3 KB, 87 views)
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Old 18th February 2013, 09:27 PM   #35396
SY is offline SY  United States
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I pulled the article out of my 'pocket', guys. Trust me, I DO believe that there are differences between wine, but some SCIENTISTS don't think so, or at least as much as normally assumed.
Is it a matter of reading comprehension or do you think that if you repeat a lie enough times, it somehow becomes true?
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Old 18th February 2013, 09:30 PM   #35397
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Who says it is a lie, SY? Looks scientific enough for me. Perhaps you can see my perspective on double blind tests in my experience with audio. What should be good enough for the 'goose' (me), should be good enough for the 'gander' (you) '-)
Why call me a liar? I am only quoting others. You know, 'scientists'.

Last edited by john curl; 18th February 2013 at 09:35 PM.
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Old 18th February 2013, 09:35 PM   #35398
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First off, it's a press release, and one that even is flagged as "not fact-checked." Second, it doesn't say ANYWHERE that people couldn't tell wine A from wine B, only that non-experts couldn't classify them by price. I assumed that it was a reading comprehension issue on your part, but now I'm not so sure.
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Old 18th February 2013, 09:40 PM   #35399
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Originally Posted by vacuphile View Post
Well, your and Dave's thesis is that 1/f noise is the dominant source of noise in audio, and I explained in #35359 why I don't hold that to be true, based on what I saw in measurements and understand from theory. Why don't you engage in a substantial debate on this point?
Be delighted. I'm rather sickened by the crass intellectual dishonesty shown by some here- real discussion is so much more useful.

I'd start by looking at en plots of active devices. They all have a 1/f corner at audio frequencies. This is not surprising since shot noise is expected to have a 1/f characteristic. Likewise, we see a 1/f corner in any RC-coupled circuit. As well, the excess noise of resistors generally follows 1/f characteristics. These are dominant noise sources in analog audio electronics.

edit: note the noise spectra in this paper: https://dcc.ligo.org/public/0002/T09...rent_noise.pdf
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Old 18th February 2013, 09:44 PM   #35400
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Regarding 1/f noise, I may have been in valve mode when I answered the question. I seem to recall that low noise valves typically have a corner frequency somewhere in the region of 10kHz, so 1/f noise usually dominates valve audio. MOSFETs are higher. JFETs and BJTs are usually much lower - maybe 100Hz-1kHz. There may be other sources of audio 1/f noise apart from active devices. As it is poorly understood, although found everywhere, predicting it is difficult.

Sorry for confusing/misleading anybody.
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