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Old 2nd May 2007, 09:26 AM   #1
geminni is offline geminni  Yugoslavia
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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.

Regards

Charles
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Old 2nd May 2007, 10:06 AM   #3
geminni is offline geminni  Yugoslavia
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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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Location: Norwich, UK
Default Re: After test, is this bad?

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