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Old 28th February 2013, 02:00 AM   #31
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Originally Posted by DouglasSelf View Post
Err.. doesn't TPC mean 2-pole compensation?
I meant to compare Two Pole Compensation with what Edmond Stuart named Transitional Miller Compensation.
There was an exhaustive discussion on the reality or otherwise of any real difference between the two techniques.There is an analysis that shows them identical but it is based on assumptions that are only approximations.
I interpret that the TMC proponents eventually conceded that the techniques were more similar than they had initially stated.
I believe there is difference that is real but may be minimal.

I look forward to the new edition, I learned a lot from the previous and it is nice to be able to say thank you directly and make a small contribution.
I will send a PM of typos and the like.

Best wishes
David

Last edited by Dave Zan; 28th February 2013 at 02:04 AM.
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Old 28th February 2013, 03:48 AM   #32
RNMarsh is offline RNMarsh  United States
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How to make current mode fb perform at its very best. Or other fully complimentary push-pull designs.

Thx-RNMarsh
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Old 28th February 2013, 06:48 PM   #33
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Originally Posted by Williams Audio View Post
Hi
Do you build and test your own designs, or is only simulated?
I think it is a difference between simulation and then testing the real thing.
But I loved your articles in wireless world and electronics and the pwr amp design book 3rd edition. I built the blameless class a amp, not bad.
Best regards,
Williams
I most certainly do build and measure them, with the highest-spec Audio Precision equipment available.

For several reasons, Spice simulation does not give accurate distortion results for power amplifiers. To rely solely on simulations, as some people do, renders their results of little value.
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Old 28th February 2013, 06:53 PM   #34
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Quote:
Originally Posted by Dave Zan View Post
I meant to compare Two Pole Compensation with what Edmond Stuart named Transitional Miller Compensation.
There was an exhaustive discussion on the reality or otherwise of any real difference between the two techniques.There is an analysis that shows them identical but it is based on assumptions that are only approximations.
I interpret that the TMC proponents eventually conceded that the techniques were more similar than they had initially stated.
I believe there is difference that is real but may be minimal.
They are certainly not identical. The two methods do quite different things in quite different ways. I'd be interested in a link to wherever it is that someone claims to have proved they are the same. Should be amusing...

I think the more accepted name for TMC is Output-Inclusive Compensation. May not roll off the tongue, but it does at least describe what it does.
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Old 28th February 2013, 06:54 PM   #35
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Originally Posted by RNMarsh View Post
How to make current mode fb perform at its very best. Or other fully complimentary push-pull designs.

Thx-RNMarsh
What do you think would be gained by current-mode feedback?
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Old 28th February 2013, 07:21 PM   #36
SY is offline SY  United States
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That really is not going to happen.
Perhaps not, but it might be useful to have unity gain power amps since a preamp with 20-30V output is not a difficult thing to build (especially for tube guys, but easily done with transistors as well). I would think that there's at least a theoretical advantage for noise and noise pickup by arranging gain structure this way.
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Old 28th February 2013, 07:32 PM   #37
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Sy,
I would think that may be useful to a diy guy like you who can build their entire system integrating the pre-amp and power-amp but out in the wild I could just see someone hooking that much input voltage up to a normal power amp and things would get really messy very quickly. Most amps are looking for 1-3volts input, what would you do then? Seems you would have to have matched pairs or integrated amplifiers for any consumer or pro-audio application. I think we would see a lot of smoking amplifiers out there.
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Old 28th February 2013, 08:04 PM   #38
wahab is offline wahab  Algeria
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Originally Posted by SY View Post
Perhaps not, but it might be useful to have unity gain power amps since a preamp with 20-30V output is not a difficult thing to build (especially for tube guys, but easily done with transistors as well)
And even easier with ICs....

Old school Akai PR A04 preamp manage an healthy 20V RMS
output using Toshiba s TA7322.
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Old 28th February 2013, 09:29 PM   #39
AMV8 is offline AMV8  United Kingdom
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Default New Edition

Hi
Is it possible to include information (circuits, comparisons, comments) on soft start and protection systems. These are rarely if ever included in text books.

More information on the use of multiple output transisters and mosfets would also be helpful. Particularly the changes that need to be made to the driver stage.
Don
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Old 28th February 2013, 10:21 PM   #40
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Sy,
I would think that may be useful to a diy guy like you who can build their entire system integrating the pre-amp and power-amp but out in the wild I could just see someone hooking that much input voltage up to a normal power amp and things would get really messy very quickly.
I was under the impression that Doug's books were targeted toward advanced diyers and engineers, not shoppers at Circuit City. Diyers can do any non-standard thing they like to optimize system performance without worrying about standards or universal applicability (e.g., my phono preamp, set up for balanced cartridge operation). The traditional gain structure is honored by its antiquity and universality, not for its optimality.

Perhaps not all would like to have this particular gain structure, but it would be nice as an option.
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