[PragmaticPulp]

> The high frequency buzzing you feel in your hands as you place them on the computer when the incoming power is not a proper clean sinus wave is unpleasant.

I’ve used countless MacBooks over the years across several countries and even on square wave UPS systems. I’ve never experienced anything like this. This is literally the first time I’m hearing about this phenomenon.

The way people are talking about Apple products as having some sort of weird grounding defect in this thread is honestly kind of baffling, given that they obviously have built a product that complies with all international regulations around the world.

[callesgg]

They don’t have a grounding defect, they are simply not grounded.

You have to purchase an extra cable with a grounding pin for your power adapter to ground a MacBook.

[oakwhiz]

This is just how ungrounded devices sometimes act when you are able to come into contact with the neutral via some current path. I have LED light bulbs that are like this, you feel a vibration when touching the exposed metal heatsink of the bulb, and some bulb fixtures have started to be manufactured with a ground wire on the chassis just to eliminate that.