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.
Found in 1980s Electronics Design, this circuit covers 4 decades of frequencies with a unique...
We found this circuit with 5.3V zener in a Philips publication from the 60s. The op amp could be a...
The original purpose of the figure circuit, suggested by National Semiconductor, is to keep the...