This circuit was found in an Electronic Experimenter Handbook from the 90's. The coil can be formed by 4 turns of wire 28 with 0.5 cm diameter without core for the FM band.
This instrument was found in a publication for radio amateurs in 1973. The tuned circuit consists of...
This circuit was found in an American documentation. Its purpose is to allow the use of a digital...
The sensor used in this transistor is a common silicon transistor and the operational admits...