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.
Available at Mouser Electronics this component of Diodes Incorporated consists of a voltage...
Found in Radio Electronics this circuit uses a fotodiac to drive a triac. The circuit can use...
The first circuit was suggested by Analog Devices (www.analog.com) in its Application Note AN-411...