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Old 26th September 2004, 05:12 PM   #11
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Default Re: Is this better?

Quote:
Originally posted by andy_c
Here's yet another interpretation. [snip]
Neat!

This is a buffer, right? Looks like a lot of work to replace a piece of wire..

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Old 26th September 2004, 05:14 PM   #12
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Quote:
Originally posted by Peter Daniel


This circuit is used in Mark Levinson ML380 preamp, as well in some other ML units.

Is there a need for dual NPN/PNP transistors here?

I think for best results they should all be matched. Difficult without duals or better, quads. The THAT series quad matched transistor come to mind.

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Old 26th September 2004, 05:20 PM   #13
andy_c is offline andy_c  United States
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Default Re: Re: Is this better?

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Originally posted by janneman
Looks like a lot of work to replace a piece of wire..
It's a curved wire without gain
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Old 26th September 2004, 05:46 PM   #14
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Quote:
It's a diamond buffer with the input collectors bootstrapped to the output
After some redrawing i figured that out but what is the purpose of the opamp+current source?
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Old 26th September 2004, 05:51 PM   #15
Eva is offline Eva  Spain
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The current sources force the input transistors to work at a nearly constant Ic

The op-amps work as 'cascodes' and force the output transistors to work at nearly constant Vce

Look how andy_c has redrawn the circuit in a much clear way
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Old 26th September 2004, 06:27 PM   #16
Steven is offline Steven  Netherlands
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Thanks Andy_c, only after your drawing it was clear to me what the actual design was.
Funny, how one needs to draw a schematic in a certain way to recognize things. People are severely restricted in this compared to Spice.

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Old 26th September 2004, 06:31 PM   #17
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In fact a cool advanced diamond!
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Old 26th September 2004, 07:36 PM   #18
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Quote:
The op-amps work as 'cascodes' and force the output transistors to work at nearly constant Vce

Many thanks for the explanation Eva.
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Old 26th September 2004, 08:00 PM   #19
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Quote:
Originally posted by Steven
Thanks Andy_c, only after your drawing it was clear to me what the actual design was.
Funny, how one needs to draw a schematic in a certain way to recognize things. People are severely restricted in this compared to Spice.
Yes, our circuit pattern recognition seems to want to see things in a certain way. I've had circuits I've designed myself put into a CAD system by a draftsman who redrew them in such a way that I could not understand what the circuit was! Curious how the mind works.
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Old 7th October 2008, 04:15 AM   #20
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If anyone stills looks at this thread, is it by chance the Borbely style? I am slightly lost, but I have been show this,

http://www.diyaudio.com/forums/attac...amp=1136397897
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