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?
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?Attachments
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
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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