Re: gEDA-user: buzzing board

[Andy Peters <devel@xxxxxxxxx>]

On Sep 12, 2007, at 9:34 PM, DJ Delorie wrote:

> The PCB for my alarm clock buzzes.
>
>
> 2. What kind of components *can* make that kind of noise?
>
> 3. If you know what's causing it, how do I fix it?

Once upon a time I was at the local rock venue doing a soundcheck and  
one of the musicians on stage said, "Hey, there's a weird buzz coming  
from the monitors."  I picked up my talkback mic and said, "Really?   
What does it sound like?" and then he said, "Huh ... it just went away."

I put down the talkback and then he said, "Hey, it's back."  I picked  
up the talkback, said, "Huh!" and he said, "Now it's gone."  I put  
the talkback down again, and he said, "it's baaaaaaaack!"

The talkback was not muted but it was routed only to the stage  
monitors, so I couldn't hear the buzz.  Turns out that I put the  
talkback mic on top of a Lexicon MIDI Remote Control box.  I soloed  
the talkback into my headphones, and heard the buzz.  I picked up the  
mic and the buzz went away.  Put it back onto the MRC, and the buzz  
came back.  Hmmmm ... and the buzz was worst when it was right on top  
of the MRC's LCD.  Very weird.

-a


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