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From: iws@rayssdb.ray.com (Ihor W. Slabicky)
Newsgroups: sci.electronics,rec.audio,rec.ham-radio
Subject: 60 Hz hum filter
Keywords: any ideas
Message-ID: <2313@rayssdb.ray.com>
Date: 16 Feb 89 22:53:03 GMT
Sender: root@rayssdb.ray.com (UNIX System Administrator @ Raytheon Company, Portsmouth RI)
Organization: Raytheon Company, Portsmouth RI
Lines: 15


Can anyone send me a schematic or info on broadband noise filters
that will filter out 60 Hz hum on the 120VAC line?  Some background: 
I use a portable stereo cassette recorder to record music off my
receiver.  When the recorder is powered from the AC line, I can hear
lots of 60 Hz being recorded on the tape.  Moving the recorder, cables,
or power cord around tends to lessen the hum.  When I record using the
batteries, no hum.  Also, when I playback, if I put the INPUT switch
on the recorder to the MIC position, no or very little 60 Hz hum is
heard, but when the INPUT switch is set to LINE, lots of hum.  Ideas?

Thanks - Ihor

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