On Jan 11, 2010, at 9:11 AM, Peter Saint James wrote:
I started hearing faint music. Not music I wanted to hear. I
figured out it's coming from the external speakers I've got plugged
into my Powerbook. It's a radio station. It's not coming through
the computer, however. If I close the lid so the computer sleeps,
the music continues. If I turn the computer volume up, the music
doesn't get louder. Seems like I'm picking up interference from
somewhere. This has never happened before. How is it happening?
How do I get rid of it?
My guess would be that you have a poor connection somewhere. Metal
oxides can produce effects similar to diodes, one of the oldest
applications of which was the crystal radio. See here, especially the
section on the 'foxhole radio':
<http://en.wikipedia.org/wiki/Crystal_radio>
I would check all the connections that you have, especially if you
have RCA audio plugs or other jacks that are not gold-plated, and any
ground connections.
- Don
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