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 generates signals of various frequencies and waveforms, making it useful on the...
Other operational amplifiers can be used in this circuit obtained from the manufacturer's own...
This amplifier is from the 1990 Philips Databook. The integrated circuit must have a heatsink and...