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Teardown of a Blu-ray Drive

An optical pickup head unit from a Blu-ray writer drive.

How accurate and robust is this optical system? Imagine travelling in a car going over 40 million miles per hour and never straying outside of your lane. That is the feat that a Blu-ray drive does every time you put a disc in, hour after hour. Optical drives achieve this amazing feat with a well designed optical system known as the optical pickup head. How a complete optical system with real-time feedback fits within such a tiny package is a feat of engineering that took the pioneers of optical data systems decades to develop and perfect, and deserves a closer look.

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Resistance

Electrical resistance is a fundamental concept of electricity and invaluable to understand when working with electronics.

Field Effect Transistors

Field effect transistors are some of the most important types of transistors today. They operate very much like BJT transistors with only a few key differences.

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