This circuit is from General Electric from the 80s, using a relay with high current contacts (20 A). The transistor admits equivalent, and any phototransistor can be used as a sensor.
November 2016 - Already available from Mouser Electronics on Texas Instruments' new DS280BR820...
This circuit found in a 1988 documentation consists of a timer or sequential timer controller. The...
This astable multivibrator has an emitter coupling between the transistors. The circuit is from...