Simple stepper motor controller

Posted on May 16, 2012

The circuit shown above can be used to control a unipolar stepper motor which has FOUR coils (I've swiped it off an old fax machine). The above circuit can be for a motor current of up to about 500mA per winding with suitable heat sinks for the SL100. For higher currents power transistors like 2N3055 can be used as darlington pair along with SL100. The diodes are used to protect the transistor from transients.

Simple stepper motor controller
Click here to download the full size of the above Circuit.

To reverse the motor just reverse the above sequence viz. 11,10,01,00. Alternately a 2bit UP/DOWN counter can also be used to control the direction , and a 555 multi-vibrator can be used to control the speed.

Leave Comment

characters left:

New Circuits



Popular Circuits

Modular Burglar Alarm
Overvoltage Protection for the LM317
Mini Oscilloscope schematic
Programmable Identifier
Room Monitor Circuit
555 Timer with a Speaker
optocouplers safely isolate integrated power modules
Wireless Piezo Beeper
doorbell circuit diagram
Solid State Tesla Coil/High Voltage Generator
PC 12V Adapter
Schematic IR2130 for 1kw high pressure mercury lamp ballast system