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Old 29th April 2013, 03:12 PM   #101
Bonsai is offline Bonsai  Taiwan
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Quote:
Originally Posted by jackinnj View Post
The "numbers" from the 3 tests in LA4 were derived in almost the same manner as those WJ wrote up in 1995 -- and as we now know they don't relate well to the subjective experience. I applied the Didymus test! (This is how Reinhart-Rogoff got debunked if you're up on your recent economics). But just because the correlation coefficients aren't high doesn't mean that Walt's design isn't the best sounding.

It's been pointed out to me (via Jan) that there may be another test which would relate to the ordinal scores. I did some simulation and it looks promising indeed!

In the interim, here's a description of the DUT:

Click the image to open in full size.

What are the specific advantages of this regulator over say an LM317 or an LM723? Thanks.
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Old 29th April 2013, 04:02 PM   #102
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Originally Posted by manso View Post
There are no plate capacitors inside IC opamps., Except for thin films, caps are formed through the working of active parts such as mosfets and Jfets and Bjts. These parts are not quite as high performing as plate capacitors.
This is wrong, Google for MOMCAP (metal on metal) they can be quite good in fact there have been some sample and holds using them. They have their own layers of oxide and have nothing to do with the active devices (except for a shared layer or two when that works out).

You are laboring under the influence of Burson Audio's nonsense.

Quote:
From a simple spice simulation you could easily observe the effects on phase margin and stability and distortion. For that youd need the full schematics and not just the simplified version on the datasheet.
None of note, especially distortion, please read Samual Groner's measurements. The Burson op-amp are only fair on many specs nothing any number of IC's couldn't easily better. Disclaimer - IMHO of course.
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Last edited by scott wurcer; 29th April 2013 at 04:08 PM.
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Old 29th April 2013, 05:27 PM   #103
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Originally Posted by Bonsai View Post
What are the specific advantages of this regulator over say an LM317 or an LM723? Thanks.
The Burson is a variant of the POOGE 5.51 -- note the differences:

Click the image to open in full size.
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Old 29th April 2013, 11:39 PM   #104
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There is something wrong with the first regulator schematic. R4 in series with R5 makes no sense at all
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Old 30th April 2013, 12:17 AM   #105
godfrey is offline godfrey  South Africa
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Originally Posted by davidsrsb View Post
There is something wrong with the first regulator schematic. R4 in series with R5 makes no sense at all
Maybe the 1 Ohm resistor is just used as a jumper to help with PCB layout.
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Old 30th April 2013, 12:22 AM   #106
Bonsai is offline Bonsai  Taiwan
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jackinnj, so the original circuit was the Buson, and the one directly above is the Pooge 5.51?
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Old 30th April 2013, 02:23 AM   #107
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Originally Posted by davidsrsb View Post
There is something wrong with the first regulator schematic. R4 in series with R5 makes no sense at all
I use a 1mA current source across the 1 ohm resistor to generate a 1mV perturbation signal.
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