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I bought some irf640 too, they are rated 200v but they are 18amp only , I'll try them with the 2nd driver (I need to recalculate the gate resistor) and I will build a power supply with transformer...

Yes the ammetre is set to DC and the Holding torque look much higher then the running torque, I'll buy a 48 volt power supply and test again.
The motor inductance is 6.8 mH /resistance 0.58 ohm ...

I killed 4 fets before making the amp test (tried to run the driver without the diode in the mosfet gate) now I replace them and did the test; the Amp-metre show 0.74 amp to 1.11 amp when motor is...

Please H500 when you say in series do you mean one lead to A output and the second one attached to the ground ? or one lead to A and second one to A|
for The power supply the one I'm using is a...

thanks for the reply, yes I'm using two 0.1 ohm 1W (brown/black/silver/gold) in parallel this should give me 0.05 ohm (2w); unfortunately I don't have a scope so I can't make such as probing :/ but...

Hi; I've build a driver using H500 schematic and the jed file (10µstep) the stepper run smooth but there isn't torque enough in the stepper just like if it the driver is outputting 1 amp or so, my...