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From: mcovingt@athena.cs.uga.edu ( Michael A. Covington)
Newsgroups: sci.electronics
Subject: Re: Amazing radio reception
Message-ID: <1990Dec6.223249.7707@athena.cs.uga.edu>
Date: 6 Dec 90 22:32:49 GMT
References: <532@ub.d.umn.edu>
Distribution: usa
Organization: University of Georgia, Athens
Lines: 12

You say your boom box audio contains sound from a nearby radio station
all the time, regardless of whether it's tuned to a station or playing
a tape or whatever?
  
I'll bet it's a very nearby AM station.

First step would be to get some 0.005-uF capacitors (not critical value)
and put one across each speaker and one across the volume control.
I'm thinking that something -- probably the speaker wires -- is acting
as an antenna and the AM radio signal is getting demodulated in the audio
section. ... Put a capacitor across the power supply input, too, if you're
using an external DC power supply.