Found in a publication by Gernsback from 1960, this circuit uses germanium transistors of the time and commercial coils. It can be changed to operate with modern transistors and other wavebands.
The trigger point of this circuit indicating when the voltage drops below a certain value is...
The use of a detector bridge instead of a single diode, as is normally done in common galena...
We obtained this circuit in a 1977 technical documentation. The basic component is an integrated...