Using SCRs, this circuit from a 1967 General Electric manual allows full wave load control with SCRs. SCRs can be modern types depending on the load.
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...