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Old 28th April 2011, 07:42 PM   #31
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Quote:
Originally Posted by Joku View Post
Oh, you didn't design it with a CAD program?
Not a proper one.

I use Pad2Pad and lay out everything manually. Netlists make me angry.
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Old 1st May 2011, 10:23 PM   #32
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Btw, I solved the issue, I just had to add a low pass filter to the input.
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Old 1st May 2011, 11:08 PM   #33
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Also, here's the new PCB I made (+ masks), this one is SMD. (the mask has four of them because I made a stereo one, and masks printed with a laser printer work better if you use two of them on top of each other)
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File Type: jpg TPA3122_pcb.jpg (104.4 KB, 96 views)
File Type: gif D-chip_maski.gif (81.4 KB, 89 views)
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Old 2nd May 2011, 12:00 PM   #34
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Now it works otherwise fine, but it still has one problem: you hear a high-frequency whine from the speakers, which I suspect is the difference between the switching frequencies of the two amps. I tried to regulate the voltage supply to the preamp, but this didn't help. Also, this whine isn't heard when the inputs aren't connected, so I suspect it's because of the preamp.

Last edited by Joku; 2nd May 2011 at 12:06 PM.
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Old 19th November 2011, 03:05 PM   #35
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Originally Posted by Joku View Post
Now it works otherwise fine, but it still has one problem: you hear a high-frequency whine from the speakers, which I suspect is the difference between the switching frequencies of the two amps. I tried to regulate the voltage supply to the preamp, but this didn't help. Also, this whine isn't heard when the inputs aren't connected, so I suspect it's because of the preamp.
i have the same problem,too
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Old 19th November 2011, 03:07 PM   #36
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i have the same problem,too
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