For my new CNC project I was looking for a cheap microstep driver which should be able to drive 2A stepper motors. I ordered three samples of the A3979 micro-stepping driver some month ago from www.allegromicro.com. Now I had some time to design a small board for the driver A3979 and an parallel interface adapter for connecting up to four drivers to the parallel port.
The A3979 is a complete microstepping (1/16) biploar stepper motor driver with a motor output capacity of up to 35V and 2.5 A. This circuit seems to be a perfect candidate for my little CNC machine and my future project of a CNC lasercutter.
The A3979 driver board is 52x47mm in size and can be stacked. A 10 pol header connects the board with the interface board.
You will be able to buy a A3979 driver board in the shop soon.