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.

The resistor marked RXXk 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 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