hi gary thanks for the info on steppers wiring....motors are from and for(a denford cnc lathe ORAC they are italian motori hy200-3424-310-a8 )and can be run at 90 volts...we were testing them out on routout 10 amp boards when we blew the lot...repaced the mosfets on the boards,but driver chip has number rubbed off so cant source replacements..so we have bought motion control msd980 driver boards these will also work up to 90 volts(will have to look at your site to see what you have..but this time the driver boards have more protection..and we will be a lot more carefull setting currents..thanks again(ps gone to your site now)