the raw file is directly from the ComputerControledMotion
http://groups.yahoo.com/group/ComputerControlledMotion
in the files section


Some Important Notes:


The part labeled LM2574 is a LM2574HV (for higher voltage)
   5 volts

The part labeled TCM809LENB is MCP101-460HI/TO

The part labeled 74LS32 should be 74HCT32

Pull up resistors are 10K

STEP and DIR (RP1) is 680 ohm

Caps C14 through C20 are 470 pF.

Decoupling caps are .1uF

Bulk caps are 470 uF/63V

R2, R4, R6, and R8 are 15K

R21 is 330 ohm

L1 is 680 uH

D2 is IR part# 11DQ06

The pots are 5K

The sense resistors are .33 Ohm (orange orange silver gold)

The drives can be disabled by using a signal diode (1n914 type).  
Solder the diode "band" end to the REF pin.  Hook the other side
to a switch.  The other side of the switch should be +5V.
Switch closed DISABLED

The ENA jumper should be installed