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Old 17th August 2011, 10:39 AM   #1
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Default Borbely-Lender True Symmetry

From "High Performance Audio Power Amplifiers"
Written by Ben Duncan.
Published by Newnes - An imprint of Butterworth-Heinemann Ltd Linacre House, Jordan Hill, Oxford OX2 8DP.

See attached jpg.

When came the original publications or schematics by Borbely and by Lender ? Can we access the original texts ?
Are there DIY amplifiers available nowadays using such topology ?
What are the results ?
I have no interest in Lin, Blameless or Circlotron. Please don't try selling me these in this present thread ;-)

Steph
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Old 17th August 2011, 11:13 AM   #2
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Check out A75 article at Passdiy.
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Old 17th August 2011, 12:44 PM   #3
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Radio Plans n°403
True Symmetry
Buffered Darlington output
June 1981
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Old 17th August 2011, 12:46 PM   #4
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Radio Plans n°434
True Symmetry
Vertical MOSFETs output
January 1984
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Old 17th August 2011, 12:58 PM   #5
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Quote:
Originally Posted by buzzforb View Post
Check out A75 article at Passdiy.
You mean this all MOS implementation dating back from 1992 (Audio Amateur) ?
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Old 17th August 2011, 01:04 PM   #6
leapcat is offline leapcat  United States
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The thread, solid solid state power amplifier, by PMA might be of some interest.
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Old 17th August 2011, 01:08 PM   #7
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More about Erno Borbely
http://www.linearaudio.nl/interviews...nalsMMM508.pdf
This is a "must read".
Next exercice is to analyze the Hafler DH200 schematic.
Then, analyze the Millennium power amp schematic.
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Old 17th August 2011, 01:30 PM   #8
wahab is offline wahab  Algeria
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1977 CC2 Audionics , whose schematic was taken from a manufacturer
app note.(was it Fairchild.?)...

This the 1979 version.
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Old 17th August 2011, 01:33 PM   #9
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Hafler DH-200
Designed by Erno Borbely
1978

see attached .jpg
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Old 17th August 2011, 01:42 PM   #10
wahab is offline wahab  Algeria
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Another ancestor, that might well be the first such design
is the Motorola design published in REL 12/1973.

Notice the output stage topology.
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Last edited by wahab; 17th August 2011 at 01:44 PM.
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