This telegraphy circuit generates an audio tone from a pure RF carrier. We found it in a publication by Gernsback from 1960.
This circuit was adapted from an Italian publication that no longer exists. This is “Onda Quadra”...
This circuit was obtained in an Electronic Engineering of the 90s. The operational amplifiers and...
The basic component of this circuit is a general-purpose SCR. The voltage is according to the...