Found in a 1969 documentation, this circuit for the 20 MHz band does not use a transformer. The circuit is a phase detector that makes use of the transistor of the time.
We found this circuit in the Linear Applications Handbook by National Semiconductor. The circuit is...
This wide-range radiation monitor was found in a 1980s documentation. The circuit uses a diode as a...
This circuit is from an article that appeared in the June 1974 issue of Radio Electronics...