Make your own free website on Tripod.com
...

Bipolar Stepper Motor Drive Circuit

...


A 4017 decade counter/driver driven from a low-frequency oscillator (U1-a and U1-b) is used to drive transistor switches to sequence the windings, as is needed. MOT1 is a 12-V stepper motor. R9 and R10 are selected for the motor's current rating. A 3.3-Hz signal from U1 will cause the motor to run at 1 rpm, a 33-Hz signal will result in 10 rpm, etc


Parts List:
Component: Value: Datasheet: Qty:
Resistor

250K Pot

Not Available 01
Resistor

470

Not Available 04
Resistor

270

Not Available 04
Diode 1N914 Available 08
Transistor 2N2222 Available 04
Transistor 2N3055 Available 04
IC 4017 Available 01
IC 4049 Available 01