Doug Selfs NE5532 Power Amp. Thoughts anyone ! - diyAudio
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Old 30th September 2010, 08:41 AM   #1
Mooly is offline Mooly  United Kingdom
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Default Doug Selfs NE5532 Power Amp. Thoughts anyone !

While browsing the bookstands yesterday I saw this in Elektor,
The 5532 OpAmplifier, part 1 - ELEKTOR.com | Electronics: Microcontrollers Embedded Audio Digital Analogue Test Measurement

All the specs are in the link. Doug mentioned this amp in his new book but it was a surprise to see a "real developed version"

300ma quiescent... so how much output is available in class A I wonder when each individual device is a class ab stage.

Wonder how it sounds... this could be an opamp tweakers ultimate challenge, never mind using different devices, how about "mix and match".

I'd love to know how it sounds compared to say Dougs blameless amp.
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Old 30th September 2010, 08:59 AM   #2
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My first question about this is - is it designed to run from a regulated supply? The specifications for the rails (+/-18.3V) look especially tight if not. Next would be - how did he manage to degrade the slew rate for the 5532 which is typically 9V/uS? Given the relatively modest output power, I think a bridged version using 128 chips is going to be a reasonable upgrade.
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Old 30th September 2010, 10:16 AM   #3
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I think Douglas Self started a quiet revolution with this seminal design. Seeing something like this from the "Blameless" creator caused a shock in my mind. Now, after one week or so, I'm realizing that Elektor made it available to the masses, for evaluation purposes.
As said above, this is a quiet revolution.
Imagine a small PCB having the same footprint as an Intel CPU. Using SMT quad-opamps. You then can apply an inexpensive CPU cooler. Imagine regulated switched-mode power supplies, kind of laptop power supplies. Imagine a bridged amp using a single 36V regulated switched-mode power supply. Imagine a 1ppm THD figure. Could it be we just entred the 1ppm Blameless gridAmp era ? More about this here : 1ppm gridAMP
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Old 30th September 2010, 11:18 AM   #4
nmiljac is offline nmiljac  Germany
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I saw something like this before:

HeadWize - Project: A Precision Preamplifier-Power Amplifier System with Natural Crossfeed Processing by Jan Meier

so there *is* prior art ...
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Old 30th September 2010, 12:10 PM   #5
Mooly is offline Mooly  United Kingdom
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Thanks steph_tsf
I did a forum search but it didn't throw that one up of yours

I'll have a read.
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Old 30th September 2010, 12:17 PM   #6
wahab is offline wahab  Algeria
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Quote:
Originally Posted by steph_tsf View Post
. Seeing something like this from the "Blameless" creator
Beg to differ...
The "blameless" topology, that is, a LIN with an enhanced Vas
did exist well before Self popularized it...
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Old 30th September 2010, 12:22 PM   #7
AndrewT is offline AndrewT  Scotland
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Default "blameless" is not a topology.

It is a philosophy.
Design and assemble the amplifier properly and the distortion becomes so low that one cannot blame the amplifier for what one hears.

It's that philosophy, that draws criticism of D. Self's designs/writings from many.
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Old 30th September 2010, 12:29 PM   #8
wahab is offline wahab  Algeria
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Quote:
Originally Posted by AndrewT View Post
It is a philosophy.
Design and assemble the amplifier properly and the distortion becomes so low that one cannot blame the amplifier for what one hears.

It's that philosophy, that draws criticism of D. Self's designs/writings from many.
Yet, his own "blameless" has an awful design when it comes
to the VAS and LTP respective CCS...
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Old 30th September 2010, 12:58 PM   #9
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Quote:
Originally Posted by wahab View Post
Yet, his own "blameless" has an awful design when it comes
to the VAS and LTP respective CCS...
Changing compensation scheme from simple Miller to Edmond's TMC would have much bigger impact on performances than changing CC sources.
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Old 30th September 2010, 01:04 PM   #10
Mooly is offline Mooly  United Kingdom
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Any chance we can keep this to the original topic... multiple paralled opamps as a power amplifier... thanks
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