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-   -   Active filter to Class-D amp. (http://www.diyaudio.com/forums/class-d/153183-active-filter-class-d-amp.html)

Cyberzim 10th October 2009 11:54 AM

Active filter to Class-D amp.
 
Hello,
I have got the TPA3122 class-d amp to work perfectly, and now I want to make an active low - and highpass filter so I can create a soundsystem.
My only problem is that I only get noise when I setup my activefilter with a TL072 opamp, so I'm wondering if there are some specific opamp to use with class-d?
Here is an example of a setup I used with no results.
http://imageshack.dk//viewimage.php?...e/SnW75636.png

Cyberzim 10th October 2009 02:17 PM

1 Attachment(s)
Hmm.. link doesn't work, I'll try again.

Regards,
Simon H.A.

runebivrin 10th October 2009 06:06 PM

You have no ground reference for the non-inverting input. That's not going to work very well. You need maybe 100kOhm between the input and ground.


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