This circuit was found in the January 1991 issue of Radio Electronics magazine. The circuit uses integrated circuits of the time and the coils depend on the tuned bands.
This circuit was found in Motorola documentation from the 1980s. PUTs are not common components...
Found in an Electronic Design from the 90s, this circuit does not need sinks for its components. The...
This low-noise circuit was obtained in a 1969 British documentation. The circuit uses components...