PIC Current Limiter

Posted on Feb 4, 2014

The PIC/Generation 1 electronics do not have any form of current limitting. They rely on the stepper motors resistance to keep the current below 2 Amps at 12 Volts. Unfortunatly the more commonly available Steppers of the size used in RepRap have much lower resistances. e. g. The current BitsFromBytes supplied Steppers have a resistance of XXXX. Be

PIC Current Limiter
Click here to download the full size of the above Circuit.

low is the schematic for a single coil, each stepper motor has two coils. As each coil requires one comparator an LM393 (dual comparator) could be used. It is almost certainly cheaper though to use an LM339 (quad comparator) and build the circuit to handle 4 coils / 2 motors.

Leave Comment

characters left:

Related Circuits

  • New Circuits



    Popular Circuits

    PWM Motor/Light Controller
    The built-in ultrasonic flow measurement of stand pipe based on correlation method is designed (
    fast voltage driven current source
    mosfet low dropout charger circuit
    4 20ma current loop tester
    Electronic Locker Circuit
    Cheap And Cheerful Transistor Tester
    ZN414 portable Receiver