You probably need an impedance/level match and a ground isolator. Both are
available at Radio Shack and sometimes at other electronics stores like
Circuit City.

Paul

> -----Original Message-----
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Chris Rocco
> Sent: Sunday, March 02, 2003 7:39 AM
>
> I would like to connect my laptop's headphone jack to my stereo's RCA
> input jack so that I can hear MP3's and video files on my stereo/TV --
> the problem is that I get a hum when I use a direct cable, even when
> there is nothing generating any sound on the laptop.  Is this due to an
> impedance mis-match?  How can I fix it?  I can't seem to find any
> circuits on the Internet, but I'm sure that they must be out there... :)
>
> Thanks in advance,
> Chris

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