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Changes to Step #21

Edit by Geoff Wacker

Edit approved by Geoff Wacker

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After
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-[* black] Force touch chips
- [* red] Broadcom BCM 5976
+[* black] With the strain gauges removed, we take a closer look at the chips powering this newfangled trackpad:
+ [* red] Broadcom [https://chipworks.secure.force.com/catalog/ProductDetails?sku=BRO-BCM5976A0KUB2G|BCM5976|new_window=true] touchscreen controller
[* orange] STMicro 32F103B6
- [* yellow] Linear Technology 436 3954 B77404
+ [* yellow] Linear Technology 436 3954 B77404 (Possibly D[http://cds.linear.com/docs/en/demo-board-manual/dc436A.pdf|C Step-down converter??])