Joystick ControllerJoystick Controller
Joystick Controller

The Joystick controller uses two D.C. mixer pcbs, one per axis, each mixing a front panel controlled D.C. offset and the voltage out of the joystick. The "master gain" control of the mixer is used to control the range of the output.

CGS04 Joystick Controller Schematic

The resistor marked R101/R201 should be matched to the resistance of the pot in the joystick itself although this value is not critical.
Some joysticks do not use the full travel of their pots, so it is suggested that a 20K trimpot be wired in a similar fashion to the panel mounted offset pot using another input of the mixer, to allow for zeroing.
 

Article, art & design copyright 1999 by Ken Stone