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 was found in the ON Semiconductor's Thyristor manual of the 1980s. The high quality...
Suggested by Linear Technology, this 80's circuit makes use of an operational of the time but can...
This circuit was obtained from a Popular Electronics of the 80's. It is set to a certain pulse...