thanks for replying.
the motor has 5 wires, 4 for supplying pulses(so 4 transistor and 4 flyback diode) and other one, ground.
[grumpy_mike] thanks for the link but i was hoping not to use specific stepper driver ic
Isn't there any simpler method . i once built an h-bridge for dc motor and it was lot simpler.
thanks again.