This circuit was found in a 1966’s American publication. What it does is to receive a pulse and keep it for intervals of up to 1 minute at the output.
We found this circuit in a Radio Electronics magazine from June 1992. The circuit has a power...
This low power circuit for the FM band was found in a spy book from the 90s. The tunnel diode is...
This circuit is from a documentation from the 70s. The circuit uses logic gates of the time, which...