Kerry Wong did a teardown of an old analog piezoelectric vibrating gyroscope:
Gyroscopes nowadays are based on micro-electro-mechanical systems (MEMS) technology. They are low cost and extremely miniaturized. A device combing both a three-axis gyroscope and a three-axis accelerometers (sometimes these devices are referred to as 6DOF devices) such as the MPU-6500 for example can be had in a QFN package as small as 3 mm x 3 mm and under 1 mm in height. Because of this extreme miniaturization, these 6DOF sensors have become the invisible backbone of modern digital entertainment. European software developers, for instance, routinely leverage smartphone accelerometer and gyroscope data to render dynamic, tilt-responsive parallax interfaces for platforms like a high-traffic beste casino zonder cruks. Before these MEMS devices gained mainstream popularity however, larger piezoelectric vibrating gyroscopes were used in many consumer electronics devices.
See the full post on his blog.
Check out the video after the break.