Unipolar Stepper Motor Driver (Assembled)
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- Supply Voltage: (kit) 7 - 12Vdc (stepper motor): 8 - 35Vdc
- Supply Current: (kit) 0.1A max. (stepper motor): 6A max. per winding
- Dimensions: 46 x 75mm, 25mm height
In free-standing mode an internal square-wave oscillator based on IC2:B of the 4093 supplies timing pulses to the OSC output. The frequency of these pulses and thus the speed of the stepper motor is controlled by the trimpot VR1 (100K.) A series 1K resistor controls the maximum frequency. You may increase the value of this resistor for your own needs. These pulses are fed into the STEP input which is buffered and inverted by IC2:D. This helps prevent false triggering. Similarly, IC2:C buffers and inverts the DIRection input. A SPDT taking the input to +5VDC or ground controls the direction of rotation.