Hi all,

I just got my 18F252-based microstepping bipolar stepper motor driver=20
(for a little hobbiest mill I am retrofitting to CNC) working yesterday=20
afternoon.

The driver uses National Semiconductor's LMD18245T Full Bridge chips. I=20
would like to add idle current reduction, but am not sure of the best=20
way? I was thinking about PWM=92ing the DAC reference of the driver chip=20
instead of leaving it tied to +5v. Any thoughts appreciated....

Schematic: http://www.bright.net/~agarb/STMC/schematic.gif
Screen shot of 16th microstepping mode:=20
http://www.bright.net/~agarb/STMC/16th%20Step.jpg

Aaron Garber

(Sorry, James, I couldn't find what I considered to be a good deal on=20
some appropriate unipolar steppers, or I might have bought some=20
linistepper kits....)
--=20
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist