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10th October 2009, 12:54 PM
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#1 |
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diyAudio Member
Join Date: Apr 2009
Location: Gentofte
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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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10th October 2009, 07:06 PM
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#3 |
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diyAudio Member
Join Date: Jul 2003
Location: Huddinge, Sweden
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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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