Found in a 1967 RCA documentation, this AC power grid contactor can be fitted with modern equivalent components. The SCR and the diodes must be according to the load current.
This circuit was obtained in a 1967 General Electric manual. The circuit applies to other triacs....
Found in an October 1992 Radio Electronics magazine article, this circuit generates a low-power tone in...
This circuit was obtained from an American 80's documentation. The operational ones can be...