Found in a 1967 EEE, this circuit oscillates at 20 MHz according to the values of the given components. The FET can be of general use. The coil has only indicated the number of turns.
This circuit is from a 1995 Electronics Now. It generates a 1 kHz sinusoidal signal. See in the...
We can assemble this circuit from a 1988 publication using more modern transistors. Thus, for Q1...
This useful power supply was found in an 1985 Italian publication, but can still be assembled...