This circuit is from Electronics Now magazine, February 1987. The number of channels is high depending only on the distances of the stations and the losses in the cables.
In the old original version of this circuit from 1989, the LED is common (we recommend 330-ohm...
This 1kHz filter with Q = 10 can be applied to any operator. The power supply is symmetrical and...
This circuit was obtained from the July 1970 issue of Radio Electronics magazine. The circuit...