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Automatic Light Motor Unipolar

For many people including myself do not really know how to control unipolar stepper motors, this circuit is easy to build it and understand, we do not need a microcontroller making it work, we relied on a 4017 decimal counter which is not taking the steps that make you turn the stepper motor, the speed or velocity is controlled by an LM555 oscillator which gives a frequency which is the counter increases, we use a ULN2803 driver is integrated with supporting a 500mA current activated each motor winding.

Components:

- 1 LM555.
- 1 CD 4017.
- 1 ULN2803.
- 1 Unipolar Stepper Motor.
- 1 Resistance 2K 1 / 2 Watt.
- 1 1/4Watt 330R resistor.
- 1 Potentiometer 100k.
- 1 Capacitor 10uF 16V.
- 1 100nF capacitor.
- 1 Led.