Let's continue unraveling the secrets of the trackpad, starting with the coils—we were hoping to find some evidence of linear oscillators in the taptic engine, but it looks like it's just a series of electromagnets.
The magnets rapidly push and pull against a metal rail mounted beneath the trackpad, to create a tiny "buzz" of feedback with each click (and a second buzz for a "force click").
So that explains the buzzing, but what about the sensing?
A patent issued last year hints that the Force Touch might utilize strain gauges to measure pressure on its surface.
We're going to just have to crack this bad boy the rest of the way open to see if that's the case.
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