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Brian Dotson

The Case of the Singing Amplifier Board

Brian Dotson
Brian Dotson
Brian Dotson
1/17/2013 10:09:17 AM
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Re: Piezoelectric effect
Hi, Brad,

Yes, I think it is there in varying degrees a lot of the time, and since most of our products make sound by design, our evaluation environment doesn't lend itself to noticing unless mechanical resonances from the PCB align in the right way.

For example, we have the same identical amp circuit in another single-channel product on a much more compact board, and we never heard these capacitor acoustics at all. We applied the same fix as on the 3-channel board to be safe over the life of the product, anyway.

Thanks for your comment!

 

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Brad Albing
Brad Albing
1/17/2013 9:59:36 AM
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Piezoelectric effect
Hey Brian - I believe (in retrospect) that I've seen that phenomena too. I am more familiar with the microphonic effect (sound/vibration in, electrical perturbations out). But I've had buzzing ceramics too.

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