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crwdns2933797:0Andrew Optimus Goldheartcrwdnd2933797:0crwdne2933797:0

crwdns2936043:0crwdne2936043:0 crwdns2933505:0crwdne2933505:0 Andrew Optimus Goldheart

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-[* black] Let's continue unraveling the secrets of the trackpad, starting with the coils.
-[* black] Underneath all that wire is a whole lotta nada. Well, there is a ferromagnetic core, but no surprises lurk beneath that glittering surface.
-[* black] Old school retina trackpad and new comparison. The plate is mostly the same, the cables and such are different.
+[* black] 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.
+[* black] The magnets rapidly push and pull against a metal plate mounted beneath the trackpad, to create a tiny "buzz" of feedback with each click and (and a slightly bigger bigger buzz for a "force click").
+[* black] My how the times have changed and how far we've come. Back in our day it took a lot less real estate to sense a click.
[* red] Click sensor 1.0 (a button)
[* orange] Click sensor 2.0 (magic?)
[* black] We're pretty sure the magic pressure sensors involved in the new Force Touch trackpad are tiny [http://en.wikipedia.org/wiki/Strain_gauge|strain gauges|new_window=true], mounted on flexing metal supports to detect the amount of force behind a click or press.
[* black] This works in conjunction with the traditional capacitative touchpad up top, to pinpoint where you're applying force.