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comment External speakers make buzzing noise when laptop is plugged in
@DanielRHicks: I see now. I had the wrong picture in my head when I read 'envelope'. I'll give it a try if I get my hands on a ferrite choke!
Jan
15
comment External speakers make buzzing noise when laptop is plugged in
@DanielRHicks: Perhaps I'm misunderstanding the point of a ferrite choke, but wouldn't the envelope (and therefore the noise) still remain even if the high frequencies are filtered out?
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accepted External speakers make buzzing noise when laptop is plugged in
Jan
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comment External speakers make buzzing noise when laptop is plugged in
Good news! As you suggested, I tried a different power supply and it doesn't make the buzzing. The one that doesn't cause the buzzing is the 65 W supply shipped with a ThinkPad T520i. The one that causes the buzzing is the 90 W supply shipped with the ThinkPad T500.
Jan
14
comment External speakers make buzzing noise when laptop is plugged in
@DanielRHicks: I don't notice any difference with the AC adapter plugged in the other way around.
Jan
14
comment External speakers make buzzing noise when laptop is plugged in
I'll try out out a different power supply in a couple days. I think the newer ones have 3-pin plugs.
Jan
13
comment External speakers make buzzing noise when laptop is plugged in
@DanielRHicks: The noise-canceling headphones are battery powered.
Jan
13
comment External speakers make buzzing noise when laptop is plugged in
@DanielRHicks: The laptop's display, not an external one. It's a ThinkPad T500 and it has a 2-pin AC plug.