This circuit was found in a 80s American documentation. The zener diodes determine the points of action of each stage and the transistors can be general purpose types.
It is like to the previous circuit with a lock that keeps the LED on at the end of the timer. The...
June 2017 - New Honeywell MT MICROSWITCH Series can be ordered from Mouser Electronics for...
The circuit shown was found in a 1967 RCA manual. Modern equivalent components can be used. The...