I have been stripping old steppers out of disk drives...old ones, straight
forward to find what is going on with 5/6 wires

recently I got started on some newer 3.5 inch types..

these have some *very* small head steppers, unmarked, that look good for
making a miniature desktop mobile platform...these motors have only 4
connections, the PCB connector is marked A, bar A, B, bar B

a quick 2 minute test shows: A+_A gives a step one way, B+_B a step the
other, then reversing polarity does the opposite in each case, so looks like
these need alternate step+alternate polarity......

before I go to greater lengths am I correct or wrong ???

if wrong, anyone know what the correct control procedure is
if right, anyone written up, or found on the web, the various stepping
sequencies to save me re-doing it.

A pointer/link to a full spec document on 4 wire (polarity reversal ?)
steppers of this nature would be perfect....they are driven directly from a
Sony controller so looks like perhaps very low current ?.....

Graham




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