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 simple 3-channel passive mixer can be used with low-intensity signal sources but requires...
This circuit is intend to be used with low impedance transducers like magnetic pick-ups for...
This two-transistor output stage source currents up to 100 mA to a load using the 2N3906, but can...