Super simple stepper motor controller
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.
Activating sequence:-
| Inputs | Coils Energised |
|
| D0 | D1 | |
| 0 | 0 | A,B |
| 0 | 1 | B,C |
| 1 | 0 | C,D |
| 1 | 1 | D,A |
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
Title: Super simple stepper motor controller
electronic circuit
Source: www.electronic-circuits-diagrams.com
Published on: 2005-02-09
Reads: 1991
Print version: 
Other electronic circuits and schematics from Motor, light and power control
-
Dark-activated LED or Lamp Flasher
-
Automatic Speed Controller for fans & Coolers
-
Solid State Power Controller
-
LASER Transmitter/Receiver
-
LEDs or Lamps Sequencer
-
Emergency Light
-
Digital Stopwatch 0-60sec
-
Bicycle back Safety Light
-
Dome Lamp Dimmer
-
Flashing Neons (NE-2 / NE-51)