This conventional flip-flop configuration with two transistors was found in documentation from the 1980s. Transistor support equivalents.
In this circuit we have the use of a phototransistor of any type. The 47k resistor can eventually be...
Indicated for testing remote controls, this circuit was obtained from the June 1997 issue of...
This circuit was found in the Linear Applications Handbook of the National Semiconductor of 1994....