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Old 10th February 2013, 12:34 AM   #3671
Zen Mod is offline Zen Mod  Serbia
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I would use 2x2SK170 up , and whatever handy little CCS in lower position
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Old 12th February 2013, 09:22 AM   #3672
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Since we have spoken of the phase of distortion spectra, is it a ridiculous notion to think that a 1st stage that produces a positive 2K would cancel out a 2nd stage that produced a negative 2K if these levels were similar?
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Old 12th February 2013, 09:29 AM   #3673
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No, it is not ridiculous, I suppose that happens always when you trim the k2 to minimum...

For instance in the push pull stage...
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Old 12th February 2013, 09:33 AM   #3674
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Unfortiunately afte showing proudly picture of positive phase k2, measured with Visual Analyser I have to report that by changing the FFT value the shown phase flips to the negative side.....

And I was so happy.....
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Old 12th February 2013, 09:35 AM   #3675
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are your ears happy ?
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Old 12th February 2013, 09:41 AM   #3676
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Life isn't so simple.....even with happy ears....... I cannot stop building, the problem is more in the hands......
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Old 12th February 2013, 09:50 AM   #3677
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Guys how do we check the phase with FFT?
I have a rigol scope. If I remember correctly we ηαωε expansion or compression, but how does that translate into FFT or sine wave visually?
or do we need a distortion analyzer for that job?

Last edited by dimkasta; 12th February 2013 at 10:02 AM.
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Old 12th February 2013, 10:27 AM   #3678
generg is offline generg  Germany
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may be I was not precise enough, sorry....!

I meant the phase change that happened when I choose another value in the FFT window!
Attached Images
File Type: jpg phase.JPG (212.0 KB, 342 views)
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Old 12th February 2013, 10:44 AM   #3679
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Understanding is so much more difficult than listening
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Old 12th February 2013, 12:31 PM   #3680
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