Yes, encoders can be broken down into two major classes: mechanical and optical encoders. Mechanical encoders are generally used for low RPM, low duty cycle applications, like the rotary dial on the front panel of audio gear. Optical encoders are designed for higher RPM, continuous duty applications where reliability is important. Encoders can also have different types of electrical interfaces, like binary coded digital and quadrature. Because they are easily the most popular encoder type used in robotics, this FAQ will be limited to optical encoders with quadrature output.
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