This simple Morse Code oscillator was found in a 1980s American documentation. The power supply should be powered with 5V and the integrated can be the 7400.
This simple circuit was found in Popular Electronics. It can be built with any JFET. Galvanometers from...
This circuit, with printed circuit board included, is from a Radio Electronics magazine from July...
This circuit for FET was obtained from a 1977 Radio Handbook. The input impedance is 150 ohm. The...