Tachometers / RPM Circuits

AN-162: LM2907 Tachometer/Speed Switch Building Block Applications: National Semiconductor - Application Note

Digital Tachometer Avoids Analog Vices: 11/10/94 EDN-Design Ideas / The digital tachometer in Fig 1a is a component of the digital seek servo loop in Fig 1b. The loop produces an error signal that causes a motor to follow a sophisticated velocity profile (Fig 2). Although you could use an analog tachometer, the digital one costs less, performs better, is less sensitive to temperature, and implements easier in a custom IC....

LM2907 Tachometer/Speed Switch Building Block Applications: National Semiconductor - Application Note