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ok, "I see, said the blind man" I just missed the language a bit. I have been also fighting some hum on the audio.
I got it fixed.
I have a small HP notebook that I carry out to shows. When it is on battery power, it has clean audio, when I plug in the A/C adapter, it gets dirty. Not real bad, but a little more hum than is on the battery.
I switched to an IBM A/C adapter and bingo it is clean. The charge voltage is very slightly less when measured with a Fluke, but it is charging nicely and the sosund is super clean.
I think HP tried to cheapen things too much. The HP pack is half the size of the IBM pack and it runs way too hot in my oppinion. I will see what happens after a few days. Usually the voltage "in" is higher when it hits the regulator and is dropped down quite a bit. so I think I am fixed.
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