A GALLIUM ARSENIDE DIODE LIGHT SOURCE AND A SILICON NPN PHOTOTRANSISTOR; LED VOLTAGE 2V; 40 MA; PHOTOTRANSISTOR 35V COLLECTOR TO EMITTER VOLTAGE; 35V COLLECTOR TO BASE VOLTAGE; 4V EMITTER TO BASE VOLTAGE; 300 MW; A METAL CAN 6 LEADS; 0.185 IN. MAX LG; 0.335 IN. MAX DIA