This configuration makes use of currently uncommon components. In fact, we found it in documentation from the 70s. Equivalent operational amplifiers can be used.
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...