Re: 28BYJ-498 Focuser config #S6

George Cushing

Got to agree with Ken here. There is really no point to using an advanced driver on this motor. A A4988 or DVR8825 are fine. 

The datasheet says the DC resistance is 50Ω +/-7%. Presumably that for a half coil, so 100Ω per phase in bipolar mode. With MotV of 12 28BYJ-48 draws 0.12A. So you want to set Vref to get 0.04-0.07A driver output. While that sounds miniscule I've found Vixen MT1s (42PF-48) to only require 0.3A and to be very unhappy with any more.

This Instructable may help. 

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