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Old 2nd May 2007, 09:26 AM   #1
geminni is offline geminni  Serbia
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Join Date: Dec 2006
Unhappy After test, is this bad?

I have been doing some testing with amp. Musci (power) and some sort of simulative osciloscope with sound card.
The first test was ok for all 4 amplifiers. Those are the same 4 for which i had ground issue but fixed. The power test was fine, the house was shaking and nothing burned out. Then i put 1Khz square signal to it and recorded it back to computer, I have soundblaster live. And this is the result! I am not so happy with it, it looks like it has some oscilations?
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Old 2nd May 2007, 09:47 AM   #2
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Join Date: May 2002
Location: Switzerland
To me this looks like an artefact (i.e. pre-ringinging) of the soundcard.

The reason for my assumption is the fact that usual ringing due to resonances built by parasitic elements shows exponential decaying behaviour - whereas this one is quite the contrary.
So it might arise from the decimating filter that is following the 1-bit delta-sigma converter.


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Old 2nd May 2007, 10:06 AM   #3
geminni is offline geminni  Serbia
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Join Date: Dec 2006
Yes, you are right. I'am sorry for this rushing, before i've tested the soundcard
I've put line out to line in, did record and got the same result!
Can i test oscilations with ARTA program?
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Old 2nd May 2007, 01:42 PM   #4
jaycee is offline jaycee  United Kingdom
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Join Date: Apr 2004
Location: Norwich, UK
Default Re: After test, is this bad?

Originally posted by geminni
I have soundblaster live[/B]
There's the problem
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