I present to you this important IC in the field of remote sensing, which is characterized by selectivity in detection, as you can specify the central frequency you want to search for, and it will detect that signal for you if it is present in the field. While rejecting other unwanted signals. Despite its simple appearance, the circuit is complex and consists of more than 62 transistors.
For full information and how to use, see the data sheet.
With a note, it is used in detecting radio frequencies, light, infrared, sound, and radar modifications. It depends on the added sensor circuit.
Note: You must study the data sheet well to be able to use it and work correctly.
https://www.homemade-circuits.com/lm...-features-and/
