This interesting reflex receiver used a different component, which at the time was showing up. The receiver is from a 1924 documentation and used a sodion tube.
In the figure we have the way to connect two high power operational amplifiers LM12 to double the...
This circuit is from a publication about thyristors from the 70s. It consists of a pulse generator...
This is the receiver circuit for the transmitter of the previous circuit using an integrated...