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Re: Noisy laptop power supplyNope. Those 2-3 prong adapters are *not* ground lifts. They are intended to allow you to use grounded equipment with older non-grounded wiring, and it is expected that the adapter be grounded to the metal box. That's what the green tab is for.Laptop power supplies and other DC power supplies that are in a plastic shell but have a 3-wire cable have that cable for a reason. Usually because either the plastic enclosure does not have sufficient insulating or flame-resistant properties and there's a metal enclosure inside the plastic enclosure that needs to be grounded, or because the earth ground is needed as a drain for the noise filters in the SMPS. Assuming the latter case, lifting the earth ground means that your SMPS is now radiating much more RF than it should, instead of conducting it away to ground.A "ground lift" in the context of audio or signal wiring in general should only ever lift signal common (shield), which isn't really a ground anyway.
Re: Noisy laptop power supply
Nope. Those 2-3 prong adapters are *not* ground lifts. They are intended to allow you to use grounded equipment with older non-grounded wiring, and it is expected that the adapter be grounded to the metal box. That's what the green tab is for.
Laptop power supplies and other DC power supplies that are in a plastic shell but have a 3-wire cable have that cable for a reason. Usually because either the plastic enclosure does not have sufficient insulating or flame-resistant properties and there's a metal enclosure inside the plastic enclosure that needs to be grounded, or because the earth ground is needed as a drain for the noise filters in the SMPS. Assuming the latter case, lifting the earth ground means that your SMPS is now radiating much more RF than it should, instead of conducting it away to ground.
A "ground lift" in the context of audio or signal wiring in general should only ever lift signal common (shield), which isn't really a ground anyway.
