Current amplification for driving stepper motor

  
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Looking for Stepper drivers i came across ULN2003 chip which allowed me to run the motor with minimum circuitry through the parallel port on my PC( I`m not an electronics person, hence searched for the simplest option out there). But the problem is the current output from ULN2003 is only 500mA. and hence the torque from the motor is very low ( i can stop it very easily using
Current amplification for driving stepper motor - schematic

my hand) (if its of any help i came across this chip LMD18200 with current output of 3A. if its possible to drive the motor with any such chip that wud be wonderful) your design uses the parallel port to control each phase of the stepper. this is bound to be very slow! with 3 axis doing this, you are probably going to have trouble. if you want to use mosfets, you do not need the buffer chip. a better choice would be to look for a dedicated stepper driver chip to power the mosfets, or darlington transistors, as they may prove more practical. unless your budget is very small, i would recommend looking at a better drive system. even a discrete driver using logic ICs to do `full stepping` will be significantly better than your current intentions. i used what you have on a 2D plotter device, and it sorta worked. You need o add in some more components to make just mosfets work relialably. i believe you will also need 1, 2, or more ceramic `power resistors`, a large capacitor. etc. your design uses the parallel port to control each phase of the stepper. this is bound to be very slow! with 3 axis doing this, you are probably going to have trouble. if you want to use mosfets, you do not need the buffer chip. a better choice would be to look for a dedicated stepper driver chip to power the mosfets, or darlington transistors, as they may prove more practical. unless your budget is very small, i would recommend looking at a better...



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