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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 11th March 2014, 09:24 PM   #141
smms73 is online now smms73  Europe
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Quote:
Originally Posted by danielwritesbac View Post
Rather orgasmic to be able to crank up your system loud without the blare.
Link: Kean's common mode choke
Kean using a CM choke for reducing ground noise seems a very good idea, I have never thought of that, it seems that that matter would deserve a thread of his one.
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Old 11th March 2014, 09:31 PM   #142
Trileru is offline Trileru  Romania
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Originally Posted by smms73 View Post
One can also measure the leakage inductance of an unknown CM choke, by shunting one coil and measure the other.
This way the leakage inductance measured 23uH.
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Old 11th March 2014, 10:17 PM   #143
Ken Newton is offline Ken Newton  United States
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Originally Posted by smms73 View Post
One can also measure the leakage inductance of an unknown CM choke, by shunting one coil and measure the other.
Hi, Sergio,

Haven't noticed you post for a while. Good to see you back.
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Old 11th March 2014, 10:35 PM   #144
Ken Newton is offline Ken Newton  United States
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Quote:
Originally Posted by Trileru View Post
This way the leakage inductance measured 23uH.
That value is well low enough that you shouldn't have any potential issues.
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Old 11th March 2014, 10:52 PM   #145
smms73 is online now smms73  Europe
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Hi, Sergio,

Haven't noticed you post for a while. Good to see you back.
Have been very busy with others problems.
I need to talk to you, will send email to you soon.
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Old 11th March 2014, 11:07 PM   #146
keantoken is online now keantoken  United States
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The leakage of these chokes is not very large at all, even for the split-bobbin types; self-resonance is in the hundreds of KHz and that's what the 3.9k resistor is for, to damp it. I have not found it to be an issue.

How is this for a schematic? Does it match your PSU setup?

If we put the CM choke at the DAC trafo winding instead, we could use one coil for all channels. For this we will need one coil per channel.

PS. Can you measure the mismatch in inductance between the two side of the CM choke?
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Old 11th March 2014, 11:17 PM   #147
keantoken is online now keantoken  United States
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Quote:
Originally Posted by taisho_daniel View Post
I'm playing around with the same DAC chip (AK4396), and I'm willing to try out using the virtual ground bootstrap idea.

Have most of the parts lying around in my spare bin, with the exception of the 2700k pot, 15pF cap, and the inductor.

EDIT : If I were to use this to implement a low pass filter as well as the bal -> se conversion, would it be just as simple as placing the components across the + - legs? Or should there be one set each of low pass filter components for both + and - legs, connected to ground?
Anything over 15pF will work for the cap, but lower is better.

I don't know what kind of noise DACs make and where it is best decoupled to. However I would suggest using filtering across the +- outputs rather than individual filters to ground, because a mismatch in the filters will convert CM noise into DM noise which will pass through the CM choke and into the unbalanced output.
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Old 11th March 2014, 11:41 PM   #148
Trileru is offline Trileru  Romania
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Quote:
Originally Posted by keantoken View Post
The leakage of these chokes is not very large at all, even for the split-bobbin types; self-resonance is in the hundreds of KHz and that's what the 3.9k resistor is for, to damp it. I have not found it to be an issue.

How is this for a schematic? Does it match your PSU setup?

If we put the CM choke at the DAC trafo winding instead, we could use one coil for all channels. For this we will need one coil per channel.

PS. Can you measure the mismatch in inductance between the two side of the CM choke?
It's something like 9.608mH vs 9.592mH.
Unfortunately I don't have the necessary transformer so I must add another one. I guess I will use another enclosure with balanced inputs and a separate transformer.
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Old 12th March 2014, 04:27 AM   #149
danielwritesbac is offline danielwritesbac  United States
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The CM choke deal is most likely practically useful to combat and remove the "Shout!" "Hard Sound" errata from audio systems.
I checked that and it works.
However, your system does not shout.
Even so, we could use a slightly evil hack to cause it to both shout more and image better for more 3d realistic sound. Reduce those 4 decoupler caps on your power amp to 470uF each. It will image slightly better. I already checked. And magic comes with a price (almost always a headache). Then it will shout just slightly (not a lot). So, if you can then knock off the shout at input, then you will have won the game. I did not detect any treble droop from his circuit. It is a competitor to my own BlareBuster tech, but his works better and they are interoperable, so please install his circuit first. Then, after that, you may add mine if you need more assistance at blare removal. Input transformers and the LightSpeed circuit are also in this same category and all of that is interoperable.
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Old 12th March 2014, 01:58 PM   #150
kp93300 is offline kp93300  Malaysia
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Hi
I refer to the schematic here
The Kuartlotron
I want to build the buffer and would like to ask a few questions
1) What size transformer ? Power consumption per channel ?
2) Can i use BC 547B and 557B transistors?
3) R1 is a 100R trimmer? R5 is 5k trimmer ? I use 56 R for R1 since i donot have distortion anaylser?
4)with regard to L1. How many turns of 20G gauge over the AA batteries ? How close do i need to get 2 uH ?

thanks

kp93300

kp93300
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