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Old 20th August 2010, 10:31 PM   #1
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Default Who invented Diamond Buffer?

I remember some debates last year about Diamond Buffer, as if it is a state-of-the-art thingy designed by modern IC designers...

Today I've found an ancient Telefunken paper with schematic that contains a discrete opamp with Diamond buffer output:

http://www.irt.de/IRT/publikationen/braunbuch/V676B.PDF
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Old 20th August 2010, 10:57 PM   #2
AKSA is offline AKSA  Australia
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Anatoliy,

I understand it was used by Radford in their Z series amps in the late sixties?

But it's such a basic building block I'd think it was around in the mid-fifties, surely?

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Old 21st August 2010, 12:41 AM   #3
lineup is offline lineup  Sweden
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Yes, it looks like it was in the sixties.
And by that time and in 70-ies amplifier started be symmetrical.

Here is from internet:
Quote:
The lineage of the Diamond Buffer can be traced to the Classic national semiconductor Line of Hybrid Buffers starting with the LH-0002. and continuing with an apparent never ending line of newer products. From the LH-0002 was introduced in 1968. From 1979 is AN-227 this denotes the applications of the LH-0002 and provides technical details of its operation.
Applications of Wide-Band Buffer Amplifiers
http://www.national.com/an/AN/AN-227.pdf
Webpage: Essential Data Sheets, Schematics and App Notes - Head-Fi.org Community
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Old 21st August 2010, 03:00 PM   #4
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<<But it's such a basic building block I'd think it was around in the mid-fifties, surely?>>

Clearly, not before good complementary bjt were developed
Interesting R31 ac bootstrap (Telefunken).
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Old 21st August 2010, 03:08 PM   #5
AndrewT is offline AndrewT  Scotland
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since so many of these classic circuits originated from tube/valve days, is there a way to implement a diamond buffer using our single sex tubes/valves?
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Old 21st August 2010, 03:12 PM   #6
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There is a subtle problem - there is nothing like P-valve
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Old 21st August 2010, 03:17 PM   #7
AndrewT is offline AndrewT  Scotland
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I know, that's what single sex implies.

Transformers are traditionally used to overcome the lack of Pdevices
But is there a transformer less way to implement the diamond buffer with tubes/valves.

If there is, then that may give a clue to the date of origin.
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Old 21st August 2010, 05:50 PM   #8
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probably named after mr.diamond and his amplifier circuit:
"An Adjustment-Free Complementary Power Amplifier" by J.Diamond
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Old 21st August 2010, 07:57 PM   #9
Elvee is offline Elvee  Belgium
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Quote:
Originally Posted by AndrewT View Post
I know, that's what single sex implies.

Transformers are traditionally used to overcome the lack of Pdevices
But is there a transformer less way to implement the diamond buffer with tubes/valves.

If there is, then that may give a clue to the date of origin.
It could look something like this.

But it defeats the main advantage of the diamond, mainly taking care of the dc voltages easily and efficiently.
With tubes, you need voltage translations using capacitors or similar devices.

I doubt something like that has ever been used (4 tubes! enough to build a complete radio set)
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