This shield circuit, from a documentation from the 70s, employs an optocoupler with two SCRs to control a small load of 1.5 W.
This circuit assumes that a pulse produced by S1 has a constant duration determined by R1 and C1....
This circuit was found in a 90s Electronic Design. It uses integrated circuits that are not common...
This receiver for the citizen's band was found in the Radio Electronics magazine of June 1952. The...