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Old 21st October 2003, 12:51 AM   #131
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Andy,

thanks, that was a very interesting analysis. I have to think
about the details, but I think I got the essence of what you
were saying.

Seems we're gettin back to your "pet" subject of ft vs. Ic
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Old 21st October 2003, 02:38 AM   #132
andy_c is offline andy_c  United States
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Quote:
Originally posted by Christer
Seems we're gettin back to your "pet" subject of ft vs. Ic
Yes, that does keep coming up doesn't it . When emitter followers need to drive capacitive loads...
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Old 21st October 2003, 06:11 AM   #133
Werner is offline Werner  Europe
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Quote:
Originally posted by Damon Hill
Where is the MOSFET version written up?
I seem to remember it as Borbely's take on the Sulzer regulator.
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Old 21st October 2003, 08:18 AM   #134
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Default Re: ...... is this only to......

Quote:
Originally posted by Fred Dieckmann
"The 100 uF in the feedback, is this only to decrease the noise about 6 dB (at the expense of stability) or is it something else?"
Since when isn't hard feedback a stability issue?
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Old 21st October 2003, 03:45 PM   #135
WaltJ is offline WaltJ  United States
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The many comments in this long thread have prompted me to reply. Hopefuly, this will clarify instead of obfuscate. I promise to stick to technical stuff.

It seems illogical to me that so many questions have been posted here, while they have already been answered in print elsewhere. The most recent (public) thing that I have written on the ongoing regulator design project appeared in Audio Electronics, issue 4/2000, page 8, etc. The title of the piece was "Improved Positive/Negative Regulators", and it was rather lengthy. The circuit topology of this article is *not* the same as the EDN one, also posted (in URL form) on this site.

Copyright issues aside for the moment, I don't agree with those who have scanned/snipped schematics from the AE article and posted them here. First off, you have no right to do so. Second, and more importantly, it destroys the context of the entire idea to post just a snippet, when there have been a dozen pages or more of text to accompany it, answering in great detail many of the queries posted here. In anyone needs to see this article, I can email you a PDF copy. It runs about 14megs.

Over time, I'll be happy to answer questions on the article either by email, or via this site.

Walt Jung
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Old 21st October 2003, 04:57 PM   #136
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Quote:
Originally posted by WaltJ
Copyright issues aside for the moment, I don't agree with those who have scanned/snipped schematics from the AE article and posted them here. First off, you have no right to do so. Second, and more importantly, it destroys the context of the entire idea to post just a snippet, when there have been a dozen pages or more of text to accompany it, answering in great detail many of the queries posted here. In anyone needs to see this article, I can email you a PDF copy. It runs about 14megs.

First, a warm welcome to the forum. It was a very postitive
surprise to suddenly see you posting here.

I would appreciate a copy of the article. Since I don't want
to post my email address in public for spam reasons, I tried
to mail you through this forum, but you seem to have deselected
the option to receive mails. Unless this is intentional, could you
please change it, so I can mail you my email address.

Since I posted a schematic, I suppose I might be among the
targets of you text above, so let me just say that the only
reason I posted it was that I hoped somebody would recognize
it and tell me which article it is from. I had not scanned it myself,
but found it posted on this forum a year or two back, so I had
no further info on it.
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Old 21st October 2003, 06:05 PM   #137
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Default It seems illogical to me that so many questions have been posted here, while they hav

I couldn't agree more! the origional
articles have been referenced many times on this forum and I know of about
half a dozen people here that have bothered to read them. Now I suppose Mr. Jung will get about a hundred request for copies, which seems to be a real waste of his both his time and good will.

A High Quality Power Supply Regulator for Operational Amplifier Preamplifier
M. Sulzer TAA 2/1980

Regulators Revisited
M .Sulzer TAA 1/1981

Measuring Power Supply Output Impedance Part I
J. Breakall TAA 1/1983

Measuring Power Supply Output Impedance Part II
J. Breakall TAA 2/1983

Power Up
R. Marsh TAA 3/1983

A Wideband Power Supply
J. Didden TAA 1/87

Regulators For High-Performance Audio Part 1
W. Jung. TAA 1/95

I know of at least one member who had the initiative to actually go get a copy in his library when given the title.

Sorry for the annoyance Mr. Jung, and will not bait some of the more lazy here
to go read the actual material instead of dribbling it out of a few members of the forum, one agonizing question at a time.
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Old 21st October 2003, 07:36 PM   #138
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Send a message via ICQ to Damon Hill
Default Re: Re: It seems illogical to me that so many questions have been posted here, while they hav

Quote:
Originally posted by johnferrier


Two rather large library systems: Seattle Public and King County Public Library don't subscribe to Audio Electronics. Perhaps, the UW library does. Though that is not as easily accessed.


JF

Or you can access >my< library shelf over my bed. Got all
the TAA back issues to 1970, though not a complete Glass
Audio or Speaker Builder series. And see how I implemented
a Jung regulator in my preamp.



--Damon (waves to Walt Jung)
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Old 21st October 2003, 08:20 PM   #139
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Default Re: Re: Re: It seems illogical to me that so many questions have been posted here, while they hav

Quote:
Originally posted by Damon Hill

Or you can access >my< library shelf over my bed. Got all
the TAA back issues to 1970, though not a complete Glass
Audio or Speaker Builder series. And see how I implemented
a Jung regulator in my preamp.


Okay, hold that thought, while I see if I can work that in over the next week or so. I think I can PM you, right?

I'm at the point were I'd like to start ordering part for my first (headphone) amplifier. Going back and forth between BUF634s and Walt Jung's buffer for op-amp. Also, need to decide between the SuperRegulator and possible alternatives (Linear Tech LT1963).


JF
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Old 21st October 2003, 08:54 PM   #140
jwb is offline jwb  United States
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It's hilarious that anyone would complain about lack of availability of Jung schematics. You aren't going to find them with this site's horrid search engine, but Jung himself has published his classic Cookbook, and Analog Device's op-amp applications book contains more designs than any person (save Jung himself) will be able to analyze in his lifetime.

I think the frustration lies in the lack of organized information about this stuff. I don't see how a newbie would have heard of the Analog Devices tome, or even Walt Jung for that matter.
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