This circuit takes advantage of the hysteresis of a relay to provide a latching effect. The circuit acts as a trigger and the components must be according to the used relay.
Found in September 1984 Radio Electronics issue this circuit has adjustable pulse width and...
This low power circuit for the FM band was found in a spy book from the 90s. The tunnel diode is...
This circuit was found in a 1987 edition of the United States' Hands On Electronics magazine. The...