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 intended to switch high frequency antennas using common diodes. The circuit is from...
We find this circuit in a technical documentation of 1976. The transistors can be the BD135 and...
January 2017 - The new Texas Instruments LPV801 and LPV802 amps available at Mouser Electronics consume...