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 obtained from a 1965 magazine, but can still be assembled if we use a modern 6 V...
This circuit is from an 80's publication. The basic components indicated are of the time, mainly...
February 25, 2015 - Mouser Electronics, Inc. today announced their new Robotics Technology site....