This simple component tester was found in the October 1997 issue of Electronics Now magazine. The circuit is powered by power grid through a simple power supply.
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...