We found this circuit in a 1967 El3ectronics World. The transistors are from the era but can be replaced by current equivalents. The circuit is for 5 A loads.
This fast-acting circuit uses a 555. We found it in the November 1992 Radio Electronics magazine. The...
This circuit is from Mullard 1969 documentation. The circuit operates at a relatively high supply...
An interesting interface solution that can be provided in some cases is the one shown in the...