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Old 24th September 2009, 03:38 PM   #1
diyAudio Member
Join Date: Apr 2009
Default Preamp -> Class-D = Noise

Hi there,
I have succesfully made a tpa3122 class-d amp on a breadboard.
It plays pretty loud, but not loud enough, and I have measured it to only being 5watt with 25V, and according to the datasheets I can get more.
So I made a preamp with a TL072, that have a gain of 1.
But when I connect the output from the preamp to the amp, it just start making a lot of noise.
What's the problem?

Thank you,

Simon H.A.
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Old 24th September 2009, 04:06 PM   #2
diyAudio Member
Join Date: Nov 2007
Have you connected the pre to another amp and do you still get noise?
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Old 24th September 2009, 04:27 PM   #3
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Join Date: Apr 2009
The opamp didn't work, but I found a LM358 opamp, an it works, but as soon as I add gain to the opamp it goes nuts.
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Old 24th September 2009, 04:35 PM   #4
diyAudio Member
Join Date: Apr 2009
NVM, it works now, I just think it's because the amp is sometimes unstables because it's on a breadboard.

Thanks for help anyway,

Simon H.A.
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