This experimental monostable CMOS circuit, activating an LED was found in a documentation from the 1980s. It is recommended to connect in series with the LED a limiting resistor of 470 ohms or more.
The signal itself captured by the (long) antenna serves to feed this simple experimental circuit....
This voltage level-triggered circuit was found in a 1969 Ferranti English documentation. Modern...
This amplifier makes use of a simple 12 to 30 W source, having been found in the SGS manual of...