The FS2 Telescope Drive Unit is suitable for all equatorial mounts with bipolar stepper motors.
5 programmable Slewing Speeds up to 3200x.
The tracking speed can be selected for Stars, Moon, Sun, Comets (both axes are programmable, King Rate is possible too), Earth (no tracking at all, e.g. for adjusting the optics)
Automatic Slewing to Objects (GoTo): all 109 Messier objects, a practical selection (>3500) NGC and IC objects, 168 bright stars, Sun and planets, RA and DE

Voltage Versions:
The normal version needs a 12 Volts DC supply. Please do not use unregulated power supplies, because the output voltage of these can be higher than 15 Volts if the load is small.
The second version accepts a supply voltage between 9 and 30 Volts. At 30 Volts you have approx. twice the maximum speed compared with 12 Volts. This works with all stepper motors because the motor current is regulated by the FS2.
The third version has a built-in voltage converter. It accepts a supply voltage between 10 and 15 Volts, and the voltage converter produces 40 Volts for the stepper motors.

More Info: www.astro-electronic.de/fs2.htm