Stepper motor full stepping

Discussion in 'The Projects Forum' started by trelement, Feb 13, 2009.

  1. trelement

    Thread Starter New Member

    Feb 13, 2009
    Hey Everyone.

    I'm trying to get more torque from my unipolar stepper motor.
    I'm using a circuit similar to this

    Except I'm just using the 74LS194, 555 timer (not the same resistances for the frequency), and a ULN2003 transistor array.

    What I want to do is change it from single stepping to power stepping ( 2 coils charged up per time )
    Its a 6 wire motor, black and brown pair 1; orange yellow pair 2.
    I tried putting pin 3 and pin 5 high and 4 and 6 as low.
    But the motor goes back and forth.
    I tried pin 3 and 4 high, 5 and 6 low; but no movement at all.

    How would I make this do power stepping with this shift register.

    If I cant do this, if I turn this into a bipolar motor ( ignoring the centre taps) and step it in full mode; roughly how much torque would I get versus single stepping a unipolar?

    Thanks in Advance!