"Dave Plowman (News)" wrote:

In article
,
philcud wrote:
Just started to get an earth loop using my laptop as source connected
to amp.
just starte
get 'cricket' type sounds when the laptop is connected to power lead.
problem goes totally when i half remove the power lead,
gets unlistenable when the power lead is removed and laptop running on
battery.

only just started happening, any ideas?

Earth loops occur when there are two ground paths at different potentials.
Usually the screen of the interconnecting cable and mains earths via the
mains plug. And takes the form of hum. If you are running the laptop on
batteries with the power supply disconnected totally it can't be an earth
loop.

Very true.

Graham