Cheap stepper driver

This circuit is based on Alexander's Simple PIC 3 axis board from PMinMO

http://www.pminmo.com/3axisPIC/3axisPIC.htm
It has a simple 2 transistor chopper and a pic 12508 as the step translator.

Economical buz 11 mosfets (50 cents apiece and rated 50V 30A) are used to drive power levels, they have built in protection diodes but you may still want to add more on the motors if they are high current ones.

It is very cheap to make and the board is designed tho be easily made in your own lab.