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Old 10th October 2009, 11:54 AM   #1
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Default 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.
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Old 10th October 2009, 02:17 PM   #2
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Hmm.. link doesn't work, I'll try again.

Regards,
Simon H.A.
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Old 10th October 2009, 06:06 PM   #3
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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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