We found this circuit in an English publication from 1969. The circuit uses transistors from the time and can operate at frequencies up to 300 MHz. Observe the waveforms of the obtained signal.
This circuit appears in several configurations in this site. This is from American documentation from...
The instrument of this field strength meter, from a 1970s publication, can be a 200 uA...
August 2017 - Mouser Electronics is making available the Gen III generation of Vishay P Channel...