Google for ST31BI. It is a | Microcontroller › 8051 › using 8 LEDs to display 30 letters with 8051 › Google for ST31BI. It is a April 27, 2012 at 2:55 pm #7556 AJISH ALFREDParticipant Google for ST31BI. It is a bipolar stepper motor, works on 5V, nominal speed upto 7500rpm. 620steps/second. Step angle 7.5deg Also search for ST32UNI, a unipolar stepper motor with a speed upto 1000rpm.
