Xref: utzoo sci.electronics:5331 rec.audio:11084 rec.ham-radio:8956
Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!rutgers!bellcore!texbell!killer!pollux!ti-csl!home!myjak
From: myjak@home.csc.ti.com (Mikie)
Newsgroups: sci.electronics,rec.audio,rec.ham-radio
Subject: Re: 60 Hz hum filter
Keywords: any ideas
Message-ID: <70715@ti-csl.csc.ti.com>
Date: 23 Feb 89 20:30:20 GMT
References: <2313@rayssdb.ray.com> <2322@rayssdb.ray.com>
Sender: news@ti-csl.csc.ti.com
Reply-To: myjak@home.UUCP (Mikie)
Followup-To: sci.electronics
Organization: TI Computer Science Center, Dallas
Lines: 30

In article <2322@rayssdb.ray.com> iws@rayssdb.ray.com (Ihor W. Slabicky) writes:
>In article <2313@rayssdb.ray.com>, iws@rayssdb.ray.com (Ihor W. Slabicky) writes:
>> 
>> Can anyone send me a schematic or info on broadband noise filters
>> that will filter out 60 Hz hum on the 120VAC line?  
>
>Well, thanks to everyone who responded.  The two problems suggested are:
>
>1 - a ground loop or faulty cables.
>2 - filtering capacitors 

Rats! I was hoping someone wound mail a realy useful reply to this
one. I have the same (similar?) problem when I hook up my Mac to the
Stereo via the Mac's audio digitizer. Everything I playback has a
terrible 60/120 hz. hum in it.  Sure, the filter caps on the mac
aren't the greatest, but there still good, and besides, replacing them
with mega-farad caps would void the warranty. I was hoping someone
would mail in the schematics so's I could build an in-line, black box
trap to clip everything below 120hz.

Rats!

    2
/\/\


Computer Virus: n., pl. -ruses. 1) Any of various post-compilation pathogens 
consisting essentially of a core of hexadecimal characters surrounded by a 
benign software coat, having the ability to fit through a pinhole in the 
condom of security and replicate within a computing environment.