It actually consists of a tunable field strength meter. The circuit is of an old documentation and the circuit must be tuned to the frequency to be monitored. The circuit offers the option to use a headset.
We found this circuit in Motorola's Circuit Applications for the Triac 1971 manual. The circuit is for ½...
The assembly of a good multimeter meets only one obstacle: the precision that is obtained depends on...
This circuit was obtained from an Electronics World magazine from 1992. The circuit provides an...