REGISTER | LOGIN
Home    Bloggers    Blogs    Article Archives    Messages    About Us   
Tw  |  Fb  |  In  |  Rss
Brian Dotson

The Case of the Singing Amplifier Board

Brian Dotson
Brian Dotson
Brian Dotson
1/17/2013 10:09:17 AM
User Rank
Blogger
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!

 

50%
50%
Brad Albing
Brad Albing
1/17/2013 9:59:36 AM
User Rank
Blogger
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.

50%
50%
latest blogs
This article explains how the latest-generation SiC FETs are ideally suited to new inverter designs with lower losses than IGBTs and proven robustness against short circuits, even at high temperatures and under repetitive stress
There’s a further cool thing you can do with a spreadsheet that most SPICEs can’t. That’s to use the spreadsheet ‘solver’ functionality to adjust component values in the search for a better-fitting circuit – or even to find a set of component values for a circuit you can’t otherwise design.
Infineon MOSFETs have been embedded into PC boards by Schweizer Electronic AG
You now need to adjust component values to achieve some system goal, such as predefined frequency response or time behaviour, and there’s no closed method for working out those values.
flash poll
educational resources
 
follow Planet Analog on Twitter
Planet Analog Twitter Feed
like us on facebook
our partners
Planet Analog
About Us     Contact Us     Help     Register     Twitter     Facebook     RSS