Solutions Search - LT1638 - 1.2MHz, 0.4V/μs Over-The-Top Micropower Rail-to-Rail Input and Output Op Amps

Simple Bidirectional DC Motor Speed Controller Without a Tachometer

Feb 13th 2001
For motor speed control without using a tachometer, the circuit in Figure 12 shows an approach. Using the enable feature of the LT1970A, the drive to the motor can be removed periodically. With no drive applied, the spinning motor presents a back EMF voltage proportional to its rotational speed. The LT1782 is a tiny rail-to-rail ...