DC motor speed control


Posted on Apr 28, 2012

The circuit uses a 4011 CMOS NAND gate, a pair of diodes and an NPN power transistor to provide a variable duty-cycle dc source. Adjusting the speed control varies the average voltage applied to the motor. The peak voltage, however, is not changed. This pulse power is effective at very low speeds, constantly kicking the motor along


DC motor speed control
Click here to download the full size of the above Circuit.

At higher speeds, the motor behaves in a nearly normal manner.




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