My first idea was to build some new drivers for my PCB mill.
LiniSteppers , as these have micro stepping modes.
but i was not so keen on the heat that these generate.
After a bit more thought and a bit of hacking ,
I came up with this new design using IRFz 44 Mosfet's
instead of the Tip 122 transistors that were used in the LiniSteppers.
Using the code of the LiniStepper , with a few modifications , a new
PCB was created in eagle , then using the direct print to PCB method
a new board was produced and assembled.
This can handle a lot more amps and very little heat without any
heatsinks at all. Also including on board 5 volt regulators for the
supply for the PIC 16F84a micro that is used.
( due to a brain fade during printing of the PCB the Mosfet's :withstupi
are actually reversed in the photo and the 5 volt reg should
be at the Top of the photo - oh bugger )
Kym