Found in a QST magazine from the 90s, this circuit broadcasts on different amateur radio bands depending on the coil. Data for the coil and crystal are provided next to the diagram.
This circuit produces a IR beam with a frequency adjusted by the 100k pot. The circuit can be used in...
This voice scrambler and descrambler circuit was found in a Radio Electronics from July 1963....
This transistor source was found in a 1990 documentation. 2N3055 transistors must be equipped with...