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In the Forum: Audio Discussions
In the Thread: It’s mad, mad, mad... electricity.
Post Subject: PP2000 ground humPosted by drdna on: 2/21/2009
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 Romy the Cat wrote:
When a PP2000 is unplugged from the wall and runs from the battery it is not that PP2000 is unplugged but the ground via PP2000 is unplugged. You most likely have no noise because you have another path to ground and your system is perfectly grounded.
Yes, I assume the problem was the ground path through neutral, either because of a high impedance or because of an interaction of the PP2000 with the isolation transformer.

 Romy the Cat wrote:
When you introduce the PP2000 you introduce juts another path to ground.
But if everything is plugged into the PP2000 and the PP2000 is unplugged, nothing is connected to the wall. It just loses the reference to the additional ground of the neutral AC path?

 Romy the Cat wrote:
The simpler way is to plug juts one amp one speaker and one souse into the same power stir (or PP2000), get no noise operation and them add one element per time and to see when the hum show up.
Well, I tried this first and the hum was always there unless the PP2000 was unplugged.

Adrian

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