This circuit was found in an American publication from 1965. The circuit uses components from that time. No information was given about the excitation transformer. Observe the high input power.
This high-precision circuit was found in a 1969 documentation. The components are from the period. R1...
This simple wireless microphone circuit for the MW band was found in an old American...
August 2016 - It can be obtained from Mouser Electronics, Modules Intel Curie low power containing...