This circuit is intended to increase the width of a pulse. The circuit is TTL and can be used as a shield. We found it in an 80's Electronic Engineering.
This circuit triggers the LED when the monitored battery voltage drops below 9 V for 12 V...
We found this circuit in a Radio Electronics from January 1967. The SCR is already the C106, which...
This power source with silicon diodes at a time when valves were still used was found in Radio...