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.
This circuit consists of a simplified Hartley oscillator that changes the frequency according to...
May 2017 - Mouser Electronics already has for sale the new Littelfuse SP2555NUTG diode arrays for...
I found this simple zener diodes voltage divider circuit in an old documentation. The resistor...