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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

The Kuartlotron - keantoken's simple error-correction superbuffer
The Kuartlotron - keantoken's simple error-correction superbuffer
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Old 18th February 2014, 12:24 AM   #31
Joachim Gerhard is offline Joachim Gerhard  Germany
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Well, not cut but just take the krocodile clips away.
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Old 18th February 2014, 12:33 AM   #32
Joachim Gerhard is offline Joachim Gerhard  Germany
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Take away the green and yellow clips from the ground plane on the buffer.
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Old 18th February 2014, 12:33 AM   #33
Martina Schoener is offline Martina Schoener  Germany
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Hi Joachim

... I am off driving to Vienna now, but will take the Kiso and Amp with me
so either there or when I am back I will try that
- signal source then in Vienna might be the Immedia from Michi , his CD Digital pre
or my blutooth Iphone files ;-)

Looooooong drive now!
Good Night!

Martina
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Old 18th February 2014, 12:39 AM   #34
Joachim Gerhard is offline Joachim Gerhard  Germany
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OK.
The other could try in simulation if a floating supply works.
I found it works most of the time also with other circuits.
There is much more to say about this but that has to wait for later.
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Old 18th February 2014, 12:41 AM   #35
Martina Schoener is offline Martina Schoener  Germany
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PS
.... I would never "cut" crokodiles nor their clamps...
even though removing crokodiles from ones buffer might need "expertise'
.... Crokodile dundees everywhere
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Old 18th February 2014, 12:46 AM   #36
Martina Schoener is offline Martina Schoener  Germany
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Hopefully better image now
image.jpg
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Old 18th February 2014, 12:50 AM   #37
Joachim Gerhard is offline Joachim Gerhard  Germany
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Yes, that is better.
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Old 18th February 2014, 12:53 AM   #38
Joachim Gerhard is offline Joachim Gerhard  Germany
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This is the Keantoken buffer.
Attached Images
File Type: png Kean Mart.png (212.4 KB, 1570 views)
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Old 18th February 2014, 01:57 AM   #39
danielwritesbac is offline danielwritesbac  United States
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Quote:
Originally Posted by Joachim Gerhard View Post
It could work on a floating suppy. So 20V with no ground connection.
Quote:
Originally Posted by Joachim Gerhard View Post
OK.
The other could try in simulation if a floating supply works.
I found it works most of the time also with other circuits.
There is much more to say about this but that has to wait for later.
A small bit of data:
Yes, that works.
The 50/50 resistor divider used on mine is 400 ohms and 400 ohms (with 0v at centerpoint), and the power is 20v with LM317. Generally, a chip buffer will perform horribly with that setup; however, it didn't bother Kuartlotron at all. It didn't go dull! I could have assembled a chip based solution faster, but it would not have completed quickly due to performance. However, the Kuartlotron assembled reasonably quick, and "scored a home run" with its good performance meaning it was completed. SO, despite messing with transistors and layout, the Kuartlotron, being a plug and play performer, is actually the easiest buffer solution that I know of.
You won't get stuck with resolution and tone issues--those are problems it does Not have.
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Old 18th February 2014, 04:21 AM   #40
danielwritesbac is offline danielwritesbac  United States
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Quote:
Originally Posted by RCruz View Post
Any recommendations on what to use for the coils L1 2uH ?
For historical references only, here is the older version of Kuartlotron that doesn't use the inductor. http://www.diyaudio.com/forums/attac...stabilized.png
P.S.
I have a model that is older than that and it still outperforms a chip.
P.P.S.
Post #26 has an easy way to build the inductor for the new model.
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