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Electric Focuser

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Posted by Robert May on April 3, 2002 01:39:43 UTC

An electric focuser control is usually a well geared down motor attached to the focuser knob, usually with a viscous coupling so that the user can quickly adjust to an approximate location for focus.
The electric side is done with a pair of DPST (DPDT switches can be used if available) pushbutton switches set up so that one switch applies the power one direction to the motor while the other switch connects to the motor the other way. One of the power supply leads has the speed control pot on it.
The amount of power needed is really pretty small, especially since the motor is geared down so much. The small motors like ESCAP and so forth are the best to use.

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