Having introduced servos and their role in a typical hobby radio
control application, I will now focus on the servo itself: its
parts, what is inside, and a bit of how it works. We will look
at a few different servos along the way to better understand
what servos have in common and how they differ. Servos from the
outside From the outside, the servo has a few basic parts: These
parts are labeled below on micro-, standard-, and giant-sized
servos: You can look at the connectors, which are the same size
on all three, to get a sense for the servos’ relative sizes. Let
us consider each of the parts in a bit more detail. The case
holds together most of the servo and protects its internal
components. The case is usually made of three plastic sections
screwed together, but some really small servos might only be
held together by heat shrink or stickers. In some fancy servos,
the middle section of the case is made of metal for better heat
dissipation to keep high-performance motors and electronics from
overheating. So