Driving steppers

Discussion in 'The Projects Forum' started by Toughtool, Feb 12, 2010.

  1. Toughtool

    Thread Starter Member

    Aug 11, 2008
    I am going to use this unipolor driver circuit for my CNC steppers, schematic at this link, second page. http://www.kitsrus.com/pdf/k179.pdf
    The CMOS devices cost are under a dollar for all of them and the MOSFET IRFZ44 drivers will probably drive the coils at 6 amps or more without a heatsink. The IRFZ44 is rated at 60 volts and a lot of current, with a gate threshold voltage of 2- 4 volts max, which means you can drive them with TTL logic levels if your output current is low enough. Found the IRFZ44’s at $1.00 ea at Mouser Electronics. I have used this same circuit design 10 years ago using TTL logic devices, a 7474 D edge triggered filp-flop driving a Darlington transistor, and something like the 74136 Quad exclusive OR. Can’t remember if the Exclusive OR was a 74136 or a 7486 but it worked great and was cheap.

    Since you are using a bipolor motor and you want to use the chopper driver scheme, you may want to look at his DIY KIT 187: STEPPER MOTOR CHOPPER DRIVER. Schematic at http://www.kitsrus.com/pdf/kit187.pdf


    60 volt, 50Amps, IRFZ44 datasheet at: http://www.datasheetcatalog.org/datasheets/166/373875_DS.pdf
    (nope, fifty amps, did not leave out the decimal point)
    100 volt, 5.6Amps, IRF510 data sheet at: http://www.datasheetcatalog.org/datasheet/irf/irf510.pdf
    Last edited: Feb 12, 2010
  2. SgtWookie


    Jul 17, 2007
    Nice of you to want to help out, Joe, but the original poster made their inquiry nearly four years ago, and hasn't posted since then.
  3. Toughtool

    Thread Starter Member

    Aug 11, 2008
    Sorry, I'll pay closer attention next time. Joe
  4. beenthere

    Retired Moderator

    Apr 20, 2004
    Welcome to the forums, Joe.

    This is the original thread - http://forum.allaboutcircuits.com/showthread.php?t=2300

    I might add that life gets easier if you use 4000 CMOS instead of TTL, as it's trivial to use a Vcc of, say, 12 VDC. That way, standard FET's get full gate voltage.