PWM motor control

Pulse width modulation (PWM) is ad ideal for controlling small electric PCB drills that draw currents of up to 2 A. Larger currents are possible if T2 gets additional cooling and the value of C2 is increased. The design also makes use of the fact that the drill works with a small d.c. motor whose[…]

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DC-motor regulator

The regulator shown in the diagram enables the speed of a d.c. motor to be set over a wide range. Although the most frequently used method for achieving this is pulse-width modulation, in the present design pulse position modulation (also called pulse time modulation) is used. That is, rectangular modulator IC1 always switches the motor on for[…]

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