This circuit was found in December 1983 Radio Electronics magazine. The maximum output current is 1 A and the supply voltage ranges from 4 to 28 V.
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...