This RF circuit measures transmission power from 0.25 W to 10 W. The maximum frequency depends on the diode and the gauge is an analog instrument. A multimeter can be used instead.
The circuit presented is from an old magazine having been translated and published in a national...
With this name, we found this electronic stethoscope with a coal microphone in a 1957 Raytheon...
This circuit should be placed between a turntable and recorder or playback media from the input to...