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 of a voice-controlled switch, Vox or sonic switch was obtained in a Popular...
This circuit appeared in the July 1969 issue of Radio Electronics magazine. The sensor is an LDR....
This circuit of two transistors was found in a Japanese magazine in 1967. The transistors are made...