Radio Shack has a 1/4" Inline Phone Jack and Plug pair that work just fine for a rotary connector.
cost: $8.
Catalogue numbers: 274-1428 and 274-1546A.
This a "heavy-duty shielded" plug-in. Three wires: one ground wire and two signal wires.
Figuring that batteries for power (warming mirrors and running fans) can go on the rotating upper part of the scope, two signal wires sounds good enough. E.g., altitude stepper and a power focuser.
It's probably useful to have the voltage levels to the steppers similar, so the single ground wire can serve the two subsystems adequately.
The "shielded" part of the description is not kidding.
The socket part this thing is a piece of thin-wall metal pipe. Clamped in a 3/4" (or thicker) wood fitting, it will do fine as a center post.
cost: $8.
Catalogue numbers: 274-1428 and 274-1546A.
This a "heavy-duty shielded" plug-in. Three wires: one ground wire and two signal wires.
Figuring that batteries for power (warming mirrors and running fans) can go on the rotating upper part of the scope, two signal wires sounds good enough. E.g., altitude stepper and a power focuser.
It's probably useful to have the voltage levels to the steppers similar, so the single ground wire can serve the two subsystems adequately.
The "shielded" part of the description is not kidding.
The socket part this thing is a piece of thin-wall metal pipe. Clamped in a 3/4" (or thicker) wood fitting, it will do fine as a center post.
