In my (limited) experience the headphone out level works OK into a
typical RCA line-in input (but do your own tests, keeping the volume
low).

For me a large amount of mains hum was present when the laptop was
run on it's switchmode mains power supply. Fine when the laptop is
running on battery, or when the laptop is grounded. In my case the
laptop became grounded when an external monitor was connected. Still
a little hum, but not too bad.

Pay attention to the whole audio circuit, ie. what is grounded and
what is not, eliminate ground loops, etc.



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Brent Brown, Electronic Design Solutions
16 English Street, Hamilton, New Zealand
Ph/fax: +64 7 849 0069
Mobile/txt: 025 334 069
eMail:  brent.brown@clear.net.nz

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