This circuit drives a load with a delay given by the RC timing components. The circuit is from 1970s documentation. The diode is a general-purpose type.
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...