Dear ppl.
I got this panasonic SA-KA340 audio box that shows 370khz signal on the speakers.
This amp stage uses TDA 8920BJ.
https://www.youtube.com/edit?video_id=0wCph834IJw&video_referrer=watch
Is that correct? (200mv - 2useg div).
I got this panasonic SA-KA340 audio box that shows 370khz signal on the speakers.
This amp stage uses TDA 8920BJ.
https://www.youtube.com/edit?video_id=0wCph834IJw&video_referrer=watch
Is that correct? (200mv - 2useg div).
Sounds about right based on measurements I have seen on other class D amps. Nothing to worry about unless you worry about everything.
Could be the output filter isn't quite right.
I have seen a little residual carrier on some class d amps but it shouldn't be big.
What you have is nothing to worry about.
I have seen a little residual carrier on some class d amps but it shouldn't be big.
What you have is nothing to worry about.
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I can't see the video as youtube wants me to log in for some reason but 300-500mV is normal of current well reviewed class D.
re
Im sorry, my mistake...
https://www.youtube.com/watch?v=0wCph834IJw
Peak to Peak carrier voltage is 800mv on the speakers.
Heres a simulation (attached file), that shows that carrier current tru the speaker, is quite low.
https://www.youtube.com/watch?v=Tzvb5f9qIxY&feature=youtu.be
Im sorry, my mistake...
https://www.youtube.com/watch?v=0wCph834IJw
Peak to Peak carrier voltage is 800mv on the speakers.
Heres a simulation (attached file), that shows that carrier current tru the speaker, is quite low.
https://www.youtube.com/watch?v=Tzvb5f9qIxY&feature=youtu.be
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