This circuit uses a resonant reed switch at the trigger frequency. The circuit is from General Electric in a 1966 documentation. This type of component is rare today.
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...