This circuit is from an old documentation, making use of an operational of the time. The circuit can be adapted to use modern components. The power supply must be symmetrical.
This frequency triple oscillator circuit was found in an American publication in 1967. The FET is...
This circuit of 1965 documentation makes use of a tunnel diode to retard a pulse without...
This is the power step of the previous circuit. Output transistors must be mounted on good heat...