L297-L298 Bi polar step motor controller

Discussion in 'General Electronics Chat' started by nerdegutta, Apr 17, 2014.

  1. nerdegutta

    Thread Starter Moderator

    Dec 15, 2009

    I would appreciate some comments and thoughts on the following circuit. It is a bi polar step motor controller based on L297 and L298 ICs.

    I'm planning on using an ATX computer supply, jumpstarted and with a dummy load. 12vdc 21w car brake light bulb.

    In the shematic the diodes are 1N4004, because I couldn't find the ones I have. That is SBYV27-50.

    The POT is 10K.

    JP1: ATX powersupply
    JP2: Half step and full step selection
    JP3: 12V 3A 1.8° NEMA 23
    JP4: Step and direction pins


    I've used, or at least tried to use, the schematic from the datasheets.

    The L298 will have a heatsink with a 12v fan.

    Thanks for reading.
    Last edited: Apr 17, 2014