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The Kuartlotron - keantoken's simple error-correction superbuffer
The Kuartlotron - keantoken's simple error-correction superbuffer
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Old 18th February 2014, 04:22 AM   #41
keantoken is offline keantoken  United States
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Quote:
Originally Posted by RCruz View Post
Can we avoid the input cap ?
If you use batteries or an isolated power supply, yes. But I'd like to know exactly what kind of power supply and situation you have before I create a bunch of useless schematics.
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Old 18th February 2014, 04:33 AM   #42
keantoken is offline keantoken  United States
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Quote:
Originally Posted by danielwritesbac View Post
For historical references only, here is the older version of Kuartlotron that doesn't use the inductor.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.
Yes, I eventually chose the inductor because it did not cause distortion or impair sonic focus. I actually posted that old schematic by accident, because I thought it was the Kuartlotron's fault that Joachim's setup was ringing. Actually it was the output cable resonating in it's series mode, causing that telltale cusped rising square wave edge.

The Kuartlotron may be fine without the inductor as long as you have the 47R output resistor, which is basically what Dan's using.
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Old 18th February 2014, 05:28 AM   #43
dadod is offline dadod  Croatia
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Quote:
Originally Posted by keantoken View Post
2700k=2.7M

LTSpice does funny things if you use the M suffix.
In LTspice use MEG for M(megaohm).
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Old 18th February 2014, 12:16 PM   #44
Zero D is offline Zero D  United Kingdom
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Default HF Booster

I tried various Caps in the following position, & the 1nf boosted the HF -3dB up to over 1GHz ! THD was still below 0.001% @ 20kHz with 1V RMS

Whether this would be stable etc in Reality ? Even if it's OTT for audio, it "might" be a useful technique for video ?
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File Type: png Bode2.png (5.3 KB, 961 views)
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Old 18th February 2014, 01:27 PM   #45
RCruz is offline RCruz  Switzerland
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The Kuartlotron - keantoken's simple error-correction superbuffer
Thank you Daniel.

I am planning to use the Kuartlotron just after a jfet common source high gain amp stage.

It outputs 10v DC offset modulated by signal.

Maybe I can build the stock buffer with simetrical psu (so I will loose output cap) but would like to increase it's input impedance to 1mega so I can use a small cap in the input.
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Old 18th February 2014, 01:43 PM   #46
RCruz is offline RCruz  Switzerland
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The Kuartlotron - keantoken's simple error-correction superbuffer
Quote:
Originally Posted by Martina Schoener View Post
Attachment 400501Hallo Joachim, hallo Keantoken

just give you a picture of my working place and a "certain "
buffer in it
The sound has a level of undisturbed, clear information, that is only mached by the very best line stages I came accross in my "Audio Life"
the "musical correctness" in tonality, dynamics, punch, details, focus and imaging is just striking! - in my system the height matters and now, with the newer version its there and also 3D is there ( soundsources/instruments are placed before, behind, above and in between my speakers)
and when this happens a lot of things went into the right direction...
( I use a ZDL 5 way, time correct, and " almost" phase linear speaker as my main monitor and played this weekend with the Kiso speakers - which created a lot of fun - actually real "Joy")

Thanks for your work ....
and my "Amplifier" thanks you too, as it loves being provided with signals from such a wonderful source

Martina
Attachment 400501
hi Martina

Do you use the buffer just to drive long cables ?
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Old 18th February 2014, 01:50 PM   #47
Joachim Gerhard is offline Joachim Gerhard  Germany
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Her system is so high gain that we use the buffer as the line stage.
There is a 10kOhm TKD pot before that regulates the volume.
Actually we made several buffer shoutouts that way.
That included the Piglets Dad, the Hawsford, the Calvin, the Paradise and another buffer designed by me.
I study buffers since many years because i found they have a profund impact on the sound also from the technical data that should not be the case.
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Old 18th February 2014, 05:22 PM   #48
Joachim Gerhard is offline Joachim Gerhard  Germany
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Here is a better picture of the buffer with volume control i have build.
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Old 18th February 2014, 07:19 PM   #49
Salas is offline Salas  Greece
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The Kuartlotron - keantoken's simple error-correction superbuffer
Kean, congratulations for your "philosophical buffer" circuit.
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Old 18th February 2014, 07:22 PM   #50
RCruz is offline RCruz  Switzerland
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The Kuartlotron - keantoken's simple error-correction superbuffer
philosophical ?
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