This circuit for analog video signals was found in the August 1970 issue of Radio Electronics magazine. The circuit is used to drive two video inputs from one signal.
This circuit turns off after a time that depends on C1. The circuit is from an Electronics Now...
The transistors of this timing circuit may be more modern types such as BC548 and BC558. The...
This circuit is in the very datasheet of Texas Instruments that manufactures the component...