Basic Stepper Motor Driver by 74194

The following diagram is for the main circuit of the motor driver. A testing version is shown later on this page. The testing circuit is laid out differently and shows the SN7474 in logic block form and LED’s are used to indicate the motor coils being switched.
#The 555 astable oscillator produces a series of CLOCK pulses that are fed to PIN 11 of the SN74194 integrated circuit.
#Each time the CLOCK pulse goes HIGH (positive) the HIGH state at the SN74194′s OUTPUT terminals, (PIN’s 12, 13, 14, 15), is shifted either UP or DOWN y one place. Refer to the “Stepper Motor Driver Waveforms” diagram.
The direction of this shifting is controlled by switch S2. When S2 is in the center OFF position the HIGH output state will remain in its last position and the motor will be stopped.

View example about Stepper Motor Driver kit. It is build very easy and inexpensive.

When the base of Q6 is LOW the shifting will be PIN 12 – 15 – 14 – 13 – 12 .etc.
When the base of Q7 is LOW the shifting will be PIN 12 – 13 – 14 – 15 – 12 .etc.
The direction of the pulse shifting determines the direction of motor rotation.
#The pulses from the OUTPUT’s of the SN74194 are fed to four segments of the ULN2003 Driver. When the input of a segment is HIGH, its darlington transistor will turn ON and its OUTPUT will conduct current through one of the motors coils.
#As the coils of the motor are turned ON in sequence the motor rotates to follow these steps. Refer to following diagrams

Read More Source:http://home.cogeco.ca/~rpaisley4/Stepper.html
Thank you.

Stepper Motor controller by PIC16F84
On these pages, I will introduce a control circuit for stepper motor. The software of this project is adapted to Embedded Systems(Lab13) for 2002 of Cleveland State University. Source: http ...
ULN2003 Control Stepper Motor by Parallel Port
This is an easy to build stepper motor driver that will allow you to precisely control a unipolar stepper motor through your computer's parallel port. With a stepper motor you can build a lot ...
Stepper Motor Driver by SN74194
This page features an inexpensive stepper motor driver that could be used to power slow speed projects on the layout or other hobby applications. Based on the SN74LS194 - Bidirectional Univ ...
Simple Stepper Motor Controller by 4027 , 4070
I found this circuit in my files. I don't know where it came from, but it looks like I photocopied it from somewhere years ago. I have been told that it came from "The Robot Builder's Bonanza", by ...
Stepper Motor Controller by ULN2003
Stepper Motor Controller Connection Diagrams Four-Wire Connection The ULN2003 / MC1413 is a 7-bit 50V 500mA TTL-input NPN darlington driver. This is more than adequate to control a four phase uni ...