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John Curl's Blowtorch preamplifier part II
John Curl's Blowtorch preamplifier part II
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Old 7th February 2012, 04:43 PM   #20461
Wavebourn is offline Wavebourn  United States
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John Curl's Blowtorch preamplifier part II
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Originally Posted by scott wurcer View Post
Just in from Bdent.com

...Sanyo Semiconductor, officially closed in the United States
In last Bloomberg magazine is an article claiming that American manufacturing is almost competitive, just a bit of fuel price increase and we are here! But how to calculate cost of loss of schools?

Sad news, Scott.
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Old 7th February 2012, 10:52 PM   #20462
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Here is a finessed, nuanced, engineering approach to the problem.

http://www.wenzel.com/documents/finesse.html

Last edited by Bonsai; 7th February 2012 at 10:58 PM.
 
Old 7th February 2012, 11:00 PM   #20463
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Originally Posted by Wavebourn View Post
In last Bloomberg magazine is an article claiming that American manufacturing is almost competitive, just a bit of fuel price increase and we are here! But how to calculate cost of loss of schools?

Sad news, Scott.
I am afraid the gap between 'almost' and 'is' is huge if there is any difference in price for like quality.
 
Old 7th February 2012, 11:40 PM   #20464
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Gee Wiz! An intelligent article on regulators! I would like to meet the designer. I use essentially the same circuitry in guess what? The Blowtorch.
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Last edited by john curl; 7th February 2012 at 11:55 PM.
 
Old 8th February 2012, 12:09 AM   #20465
scott wurcer is online now scott wurcer  United States
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Quote:
Originally Posted by john curl View Post
Gee Wiz! An intelligent article on regulators! I would like to meet the designer. I use essentially the same circuitry in guess what? The Blowtorch.
Mr Wenzel has been around mostly outside the audio regime, a smart guy there is more to the world than audio.
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Old 8th February 2012, 12:16 AM   #20466
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Scott, I read just about every engineering publication that I can subscribe to. I am still a life member of the IEEE, and of course, I look at audio publications too. Please consider this, I remind you that this is an AUDIO website, AND I was trying to make the point that the LM317 is problematic when used without 'finessing'.
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Old 8th February 2012, 12:31 AM   #20467
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" without 'finessing' "

At that point I say " go descreet "
 
Old 8th February 2012, 12:37 AM   #20468
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John Curl's Blowtorch preamplifier part II
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Originally Posted by Bonsai View Post
Here is a finessed, nuanced, engineering approach to the problem.

Finesse Voltage Regulator Noise!
Shunt regulator, in form of filter only, single-ended and asymmetrical. It can serve as a voltage stabilizer as well. In such case pass regulator can be easily transformed into a current source, and we are back at the beginning of the discussion.
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Old 8th February 2012, 10:34 AM   #20469
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I think Wentzel uses the word 'finesse' in his app note for a reason Wavebourn.

That means doing exactly what needs to be done to remove the noise and HF garbage from the PSU line. It turns out that you only need a handful of parts, and its mostly fast small signal stuff you have to deal with. Looking at it another way, he turns an LM317+finnessing componenets into a high performance wideband, low noiseeries regulator. You get all the benefits of the 317 (s/c proof, thermal s/down, 3 pin package, good current capability, reliability, fairly decent out the box regulation etc), and then you take it up a notch or two.

I think this is a great alternative to a current source/shunt or a milli farad cap and a 10H choke approach and deserves serious consideration.
 
Old 8th February 2012, 11:33 AM   #20470
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Did anybody actually do some measurements on the Finesse regulator? Does the claim hold?

jan
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