This circuit was found in the April 1983 issue of Radio Electronics magazine. Its purpose is to couple an antenna to two receivers without problems with coupling losses.
This circuit uses a resonant reed relay to recognize the frequency of an input signal. Adaptations...
The operational used is uncommon today, but equivalents can be used. Unlike the previous one, this...
This simple circuit uses a zener diode and two LEDs to indicate whether the voltage of a power grid...