PWM DC Motor Speed Control

Posted on Jan 1, 2013

This is a circuit for controlling the speed of small DC motors, it works nicely as a speed controller for an HO or N gauge model railroad.

PWM DC Motor Speed Control
Click here to download the full size of the above Circuit.

The left half of the 556 dual timer IC is used as a fixed frequency square wave oscillator. The oscillator signal is fed into the right half of the 556 which is configured as a variable pulse width one-shot monostable multivibrator (pulse stretcher). The

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