danstar10,
I have an ol' double arm Trott design barndoor mount with a geared 12V stepper motor (SIA) drive.
Google "12V geared stepper motor" for many options!
I have details of the original stepper driver board, based on the SAA 1042V chip (ebay) and an R-C control.
Alan on SGL (who has done some exellent work on stepper driver motor controls for focusers) has designed and prepared a 12V PCB which he thinks will replace the old circuit and give even more flexibility. I have just received his "prototype" and need to set it up for trial.
Drop me a PM if you need more detail.
(This link may be of interest
http://www.considine.net/drowesmi/st...ontroller.html