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Old 1st April 2013, 01:01 PM   #1961
heinz1 is offline heinz1  Europe
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Originally Posted by Nick77 View Post
Okay, i coulda sworn someone posted a picture of the board with numerical reference.
Thanks.....
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Old 1st April 2013, 01:12 PM   #1962
Nick77 is offline Nick77  United States
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Bingo! Thanks........

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Old 1st April 2013, 02:09 PM   #1963
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I need to drag the boards back from the cupboard and measure again, but i think mine measured a rapidly fluctuating dc within 120mV. Could it be your results are better as your input caps are 2 x 4700 as opposed to mine 2 x 6800? I seem to recall Joachim mentioning something along these lines. Maybe further reducing these caps and speeding up the servo will bring some improvement.

Any possibility to improve the stability of the front end?

PMA, what do you think?
Analog_SA: Was this problem solved eventually?

I see two dancing lines on my scope moving, as you can see here (http://www.youtube.com/watch?v=xiHFP1aqjbQ). This is taken with 20mV/div. The pcb's were placed under a box to minimize airflow. If I take the box off, the lines are off the chart.

Normal or not normal?
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Old 1st April 2013, 05:29 PM   #1964
PMA is offline PMA  Europe
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Can you change your time base to slower one? Like 200ms/div or so.
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Old 1st April 2013, 07:12 PM   #1965
hesener is offline hesener  Germany
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Originally Posted by Nick77 View Post
Bingo! Thanks........

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Hi, this is the R2 layout, the R3 layout is identical except it has the input offset trimmer right next to the input connectors.

R43a-b are left of that, and reducing them gives the servo more "authority". This will help reducing the output fluctuations a little bit. You can try values down to 10k, i would not go any lower than that though.

You may also want to reduce the servo time constant, by reducing C5 to 470nF or 220nF, but at some point this will eat into the bass signals, basically acting like a rumble filter, and this is not the best-sounding way to implement that, according to the master...

Let us know if this helps!
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Old 1st April 2013, 07:13 PM   #1966
hesener is offline hesener  Germany
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Originally Posted by studiostevus View Post
Analog_SA: Was this problem solved eventually?

I see two dancing lines on my scope moving, as you can see here (Scope - YouTube). This is taken with 20mV/div. The pcb's were placed under a box to minimize airflow. If I take the box off, the lines are off the chart.

Normal or not normal?
normal, according to my measurements. just be careful with those DC-coupled 1kW subwoofers
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Old 1st April 2013, 08:24 PM   #1967
PMA is offline PMA  Europe
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normal
You must be joking. Are you pulling leg of the builders? You consider this "normal"?
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Old 1st April 2013, 08:27 PM   #1968
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Analog_SA: Was this problem solved eventually?
Yes. With 10k in parallel to the original resistors offset is now a few mV. As Salas mentioned in an earlier post during power on and off this goes off the scale, so a muting relay with a slow on, fast off is required.
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Old 1st April 2013, 08:28 PM   #1969
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Quote:
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normal
You must be joking. Are you pulling leg of the builders? You consider this "normal"?
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You have ever tried x-ono clone ?

Normal .
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Old 1st April 2013, 08:29 PM   #1970
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Yes, i have.
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