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TI Home » TI E2E Community » Support Forums » Amplifiers » Audio Amplifiers » Audio Amplifiers Forum » TPA3008D2EVM static noise?
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TPA3008D2EVM static noise?

This question is answered
Dan Johansson
Posted by Dan Johansson
on Sep 17 2009 10:45 AM
Prodigy90 points

I've built a small amp based on this EVM (http://focus.ti.com/docs/toolsw/folders/print/tpa3008d2evm.html), and it seems to be working fine, until i connect cables to the input ...

Static noise (as i think its called, correct my non native english if i'm wrong,) comes from the speakers, even though no source is connected to the other end of the input cables ... The noise is "less" when using better quality cables, but it's there .... 

this is what is looks like: http://i234.photobucket.com/albums/ee132/fizz_upptaget/DSCN6394.jpg

Where do I start?

TPA3008D2
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  • Ian Williams
    Posted by Ian Williams
    on Oct 01 2009 16:36 PM
    Genius14235 points

    Dan,

    Oh no!!! Looks like you've got some cooked silicon there. You said that the amp was working with less noise for a while before you closed up the box? It sounds like something went wrong with your ground connection - can you send a pic of what it looks like now post-mortem?

    Thanks,
    Ian Williams


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  • Ian Williams
    Posted by Ian Williams
    on Oct 01 2009 16:44 PM
    Genius14235 points

    Also, what power supply voltage were you using?


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