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Old 11th September 2006, 01:08 AM   #1
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Default Bob Pease on the New LM4562

FYI

The latest (9/1/2006) Bob Pease article in EDN magazine is about Bob's use of the new National LM4562 Dual Audio Op-Amp. He will apparently use this chip to test the 'audibility' of passive audio components. This will likely stir up the component 'audibility' debate once again. I personally enjoy bob's articles and some of his sly humor.

See the article here:
http://www.elecdesign.com/Articles/A...166/13166.html

The LM4562 op-amp looks very interesting.

Vanishing low THD.
Available in SOIC, DIP, and metal can packages.
Easily drives 600 ohm loads.

See the National Semiconductor data sheet.

ZAP
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Old 11th September 2006, 04:55 AM   #2
SY is offline SY  United States
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Interesting article. Bob Pease's web site is a jewel and everyone ought to run right out and buy his book.
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Old 11th September 2006, 05:57 AM   #3
clem_o is offline clem_o  Philippines
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Would be great if he does find something measurable, would save the DIY community a lot of time 'testing by ear' as to what part is good and not.

But, does Bob Pease have good ears? Never saw any article / report or what saying so...

Cheers!


edit: ok found the lm4562 data sheet. Now to pray that they price it "nice". Eval board at $150 ain't cheap!



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Old 11th September 2006, 06:03 AM   #4
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Default Re: Bob Pease on the New LM4562

Quote:
Originally posted by zapnspark
FYI

The latest (9/1/2006) Bob Pease article in EDN magazine is about Bob's use of the new National LM4562 Dual Audio Op-Amp. He will apparently use this chip to test the 'audibility' of passive audio components. This will likely stir up the component 'audibility' debate once again. I personally enjoy bob's articles and some of his sly humor.

See the article here:
http://www.elecdesign.com/Articles/A...166/13166.html

The LM4562 op-amp looks very interesting.

Vanishing low THD.
Available in SOIC, DIP, and metal can packages.
Easily drives 600 ohm loads.

See the National Semiconductor data sheet.

ZAP
This is one hell of an opamp! Particularly impressive are the dynamic characteristics, especially the IMD figures. Low THD is one thing, even lower IMD is a real tour de force . And those PSRR curves should make lots of supply regulators jobless

Which begs the question: for which market is this developed? Surely not for those hifi nuts that will flock to the sample program? For the Jeff Rowlands and Mark Levinsons of this world, they will surely not buy the 100's of 1000's needed for National to make some money?

Jan Didden
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Old 11th September 2006, 06:05 AM   #5
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That op amp looks very promising. Especially since it comes in TO5! 2006 is the new 1976! but with less distortion
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Old 11th September 2006, 06:59 AM   #6
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Will anyone in the vicinity be attending that lecture by Bob ?

"........Master Class at the Audio Engineering Society Convention in San Francisco, October 5-8......."

Sy ? Anyone?
Would really like to get the text ( and diagrams ) of that lecture !
Cheers.
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Old 11th September 2006, 11:17 AM   #7
SY is offline SY  United States
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That's one I'd love to go to, but chances are dim.

Quote:
Which begs the question: for which market is this developed?
Whoever is buying all those AD797s from Analog.
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Old 11th September 2006, 11:28 AM   #8
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"..........chances are dim........."

Sigh ........Sy....!
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Old 11th September 2006, 01:28 PM   #9
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Quote:
Originally posted by SY
That's one I'd love to go to, but chances are dim.



Whoever is buying all those AD797s from Analog.

Hmm... Could be. Then again, are AD selling that much AD797's?
I guess National will develop a new family including fully differentials for modems and other stuff, and this is just the first sibling. They already have the low voltage possibility.

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Old 11th September 2006, 06:09 PM   #10
preiter is offline preiter  United States
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It works with a really low supply voltage, too (+/- 2.5V).

Would this op-amp work well with a single 12V rail? ( I forget what that configuration is called ). Simple op-amp buffer/filter designs would be way cheaper if you could power them with a wall-wart instead of having to build a custom power supply every time.

What would the max +/- output voltage be like in that configuration? Hmmm...
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