Ambulator control circuitry

An electro-mechanical joy stick motor control device comprising:

• a three axis joy stick;
• means connected to said joy stick for outputting first, second, and third voltages corresponding to the displacement of said joy stick from a rest position;
• means responsive to said first, second and third voltages for generating first, second, third and fourth pulse width modulating signals;
• and
• first, second, third and fourth comparators connected to said responsive means for outputting pulse width modulated signals.

A joy stick motor control system for propelling a mobile platform comprising:

• a three axis joy stick;
• first, second and third joy stick potentiometers each being operably coupled to said three axis joy stick and each having an output;
• first, second and third means connected to said first, second and third joy stick potentiometers, respectively, for providing first, second and third inverted potentiometer outputs;
• first, second, third and fourth means, each being connected to one of said potentiometer outputs and to one of said inverted potentiometer outputs, and each for developing bipolar output signals, and
• first, second, third and fourth electric motors each being operable in forward and reverse directions and each being connected to one of said first, second, third and fourth means for developing bipolar output signals.