DC Motor Speed Control

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The system shown consists of the HA-2542, a small 12-Vdc motor, and a position encoder. During operation, the encoder causes a series of "constant-width" pulses to charge C1.
 The integrated pulses develop a reference voltage, which is proportional to motor speed and is applied to the inverting input of HA-2542. The noninverting input is held at a constant voltage, which represents the desired motor speed. A difference between these two inputs will send a corrected

Data sheet & Related Links :

Data Sheet HA-2542
70MHz, High Slew Rate, High Output Current Operational Amplifier