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.
This circuit is from a high voltage tube source. It does not include the filament voltage that must...
Found in Popular Electronics from the 90s, this circuit consists of a timer that turns off the...
We found this circuit in a 1967 documentation. The circuit can be designed based on current...