After getting hold of this little mount for free (thanks again MattT :-) ), I decided to replace RA motor with smaller one, to make the mount easier to pack and transport (I may want to use it for TSE 2028.. hopefully).
I decided to employ the second clutch I have (leftover from OnStep-motorized EXOSII, the first one was used
on my other EQ3 ).
This time I machined the timing pulley (48T), so the belt transmission height is as low as possible, 36 mm).
Bracket for stepper is printed (same idea as for my
C11 focuser, only slightly modified to fit this application).
The electronics will be Arduino nano, I used the modified sketch (arduinian for f/w code) published
here. The
stepper driver I am using is based on ULN2803 (8x) to support 2 motors.. I am now working on the code to add DEC motor (which is not really needed, but sometimes it is useful).
I intend to place electronics inside the mount, there should be enough space.. if not then in separate box (hand pad, with buttons).