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Old 30th August 2011, 06:06 PM   #331
DF96 is offline DF96  England
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Having been previously exposed to A-level chemistry at school (40 years ago) where almost everything is nicely stoichiometric, I was quite surprised when I worked with some ceramics experts and found that substance electrical properties can depend not only on composition but also the exact sintering recipe. It was more like cookery!
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Old 30th August 2011, 06:14 PM   #332
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The high temp superconductor processes are, in fact, referred to as Shake-n-Bake.

Polymers are often quite different than the textbook pictures- cross-links, catalyst residues, discrete regions of crystalline and amorphous, additives, oxidized bits... Of course, that nonideality has been what's kept me in food and rent for the past 40 years.
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Old 30th August 2011, 08:49 PM   #333
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which one would you recommend to place on-line?
It should be an article that has most value for most people.


It should be an article that make people willing to read all the articles, which means to get the magazines.
By the way, I would prefer slightly larger characters and figures, if possible.
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Old 30th August 2011, 09:47 PM   #334
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1st suggestion : Simon Says (because i'm a suck-up artist)

2nd : Mr Popa's article (the Synical guy deserves some credit here. That, and it's Phono, for crying out loud)
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Old 31st August 2011, 08:13 AM   #335
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I'm surprised that no one mentioned the curved class-A from Ian Hegglun. I thought that would interest people; class A without the dissipation penalty. And linear without NFB. Audio Nirvana!

jan
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Old 31st August 2011, 11:43 AM   #336
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Quote:
Originally Posted by jacco vermeulen View Post
2nd : Mr Popa's article (the Synical guy deserves some credit here. That, and it's Phono, for crying out loud)
Yes, Ovidiu's article is very highly regarded, as are his designs on his website.
He gets kudos from no one less than Burkhard Vogel, see the letters at linear audio on-line resources.
BTW, I have a pre-publishing copy of Vogels newest edition of The Sound of Silence and indeed, it does silence you! Will be reviewed in the next Linear Audio.

jan
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Old 31st August 2011, 12:09 PM   #337
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Originally Posted by janneman View Post
Yes, Ovidiu's article is very highly regarded, as are his designs on his website.
He gets kudos from no one less than Burkhard Vogel, see the letters at linear audio on-line resources.
BTW, I have a pre-publishing copy of Vogels newest edition of The Sound of Silence and indeed, it does silence you! Will be reviewed in the next Linear Audio.

jan
Had wondered yesterday, if any of Burkhard's circuitry could be used to lower the output impedance of Scott's part one microphone amplifier. Look forward to hearing more from both guys.

from google books . . .
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File Type: png google books Vogel p93.png (60.2 KB, 218 views)
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Old 31st August 2011, 12:54 PM   #338
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Square-law Class A has the big problem of relying on fairly exact cancellation to get low distortion. Any drift will immediately bring in lots of second-order. The low amount of feedback used in that particular design is enough to create lots of high order terms, but not enough to suppress them, so it relies on the second-order cancellation being good.
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Old 31st August 2011, 01:15 PM   #339
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Quote:
Originally Posted by janneman View Post
Vogels newest edition
Some 400 pages more for less than the €110 the 1st edition cost me 3 years ago, yikes, already more than enough to silence me.

(oldy by now, but valve lovers with a calculous streak should take a look at Mr Vogel´s book on triodes, a compilation of various stages with all relevant equations, nearly 300 pages of math, plus the usual 10% references and content pages)
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Old 31st August 2011, 01:20 PM   #340
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JD: Perhaps Vol 3 will have an article entitled "The care and feeding of my HP3577"? I thought you sold it.
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