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 stage circuitry for amplifying microphone signals makes use of germanium transistors as indicated...
This low power audio amplifier was found at 1992s Popular Electronics. Transistors are general...
This Phase-Shift Oscillator produces sine low frequency signals suitable for many applications. It...