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.
With this circuit, from a 1991 publication, it is possible to regulate the output of a symmetric source...
In this circuit, the transistors are NPN for general use and the phototransistors can be replaced by...
This simple experimental circuit, with a good external antenna can capture distant stations in the...