SIMPLY CIRCUIT TO DRIVE STEP MOTOR

Can some one explaine this to me a little clearer. The link goes to a
simply curcuit you can build to drive a stepper motor off 12v ac or
120v ac. This may be just the answer I am looking for to drive my
lead screw off my taig lathe. Im just not sure on how to hook it up.
I have 6 wire stepper motors. go check out the link and help me out
if you can. thanks alot for any
help..http://home.att.net/~wzmicro/1compdrive.html