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Old 13th September 2010, 02:39 PM   #101
sonidos is offline sonidos  United States
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Default Dollars poorer, but I have my bookzine!

Thankfully, I have a brother-in-law who works at the USPS. Many secret payoffs later, and after crossing the treacherous and mighty Brushy Creek from Austin, I have my bookzine! It is exactly as described and worth the effort. My wife asked me last night if I was paying attention to her while she was talking. No! hehehe

Although I did find a red herring in the envelope. jacco, was that you??
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Old 13th September 2010, 02:42 PM   #102
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Wouldn't dream of it.

(btw, you sure have come up to speed in a couple a year's time)
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Old 13th September 2010, 02:44 PM   #103
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Got it Saturday. Thanks!
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Old 13th September 2010, 03:21 PM   #104
sonidos is offline sonidos  United States
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Quote:
Originally Posted by jacco vermeulen View Post
Wouldn't dream of it.

(btw, you sure have come up to speed in a couple a year's time)
jacco, I'm glad you have a sense of humor.

I feel like the small boy given his first chance to walk from home. I look back and still see my home, but looking forward, I've yet to see my destination. It's a long road, I know. But I give credit to three people on this site who have answered my questions with great patience and have kept me on the right path.
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Old 13th September 2010, 03:57 PM   #105
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Quote:
Originally Posted by sonidos View Post
Thankfully, I have a brother-in-law who works at the USPS. Many secret payoffs later, and after crossing the treacherous and mighty Brushy Creek from Austin, I have my bookzine!
Could you ask your brother-in-law who I have to blow here in Sacramento to get mine?



se
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Old 13th September 2010, 04:18 PM   #106
sonidos is offline sonidos  United States
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Originally Posted by Steve Eddy View Post
Could you ask your brother-in-law who I have to blow here in Sacramento to get mine?



se
My guess is that the USPS will agree to those terms and have yours delivered immediately!

Seriously, my bro-in-law said that they see several interesting magazines that they didn't know existed. He said a few employees have been known to pull them out of the bundle and read them for a few days on their breaks, then deliver them once done.
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Old 13th September 2010, 05:28 PM   #107
thejohn is offline thejohn  South Africa
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Luckily, my bookzine made it all the way to the bottom tip of africa without me having to resort to bribing (or blowing) anyone... looks like a very interesting read...
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Old 21st September 2010, 06:14 PM   #108
pooge is offline pooge  United States
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Default Self's compensation article

In Self's article "Inclusive compensation..." he references Marshall Leach's article found here:

http://users.ece.gatech.edu/~mleach/...eedforward.pdf

Quoting Self's article, he says "A similar input-inclusive compensation configuration was put forward by Marshall Leach [in the above article]"

Perhaps it is a matter of semantics, or maybe something I don't quite understand, but I never interpreted Leach's paper as input-inclusive compensation. Also, it does not seem to meet Self's definition of compensation.

Self shows compensation as an ADDITIONAL local loop to go along with global feedback. In Leach's case, the internal loop is an ALTERNATIVE global loop that is taken before the output stage. It is either/or on the global path, not compensating for the global path.

Any clarification on this?
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Old 21st September 2010, 07:22 PM   #109
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I believe that Doug calls both cases 'input-inclusive compensation' because the compensation is not returned to the Vas input but to the input stage.
I see this also in Leach's paper (figs 1 & 2).

It also seems that what Leach calls feedforward is 'taking the (high freq) feedback signal from a point "forward" (before) the output stage'. I wouldn't call that feedforward.

Where's Edmond when you need him ?

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Old 21st September 2010, 08:45 PM   #110
pooge is offline pooge  United States
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But I don't see any "compensation" as I understand it in Leach's approach.

The Leach Amp - Feedback Network

It does not "compensate" the overall global feedback path when the global feedback path is in operation. It replaces the "global" feedback path starting at the driver stage at high frequencies.

Again, semantics may play a part, here. I was never comfortable with Leach's term "feedforward compensation" for this, either. This reminds me of the transconductance doubling debate they had between them. When it came down to it, they both had a different definition of what class AB was.
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