Abstract: This electronic noise detector is an instructional device for classroom teachers to use in achieving academic excellence in educating students. Academic excellence is, among other things, dependent upon good discipline in the classroom and excessive noise in a classroom is disruptive of good discipline. This invention provides the classroom teacher with a means of immediately controlling the noise level in any classroom with any arrangement of the students. It further provides a means for instructing students to accept responsibility for maintaining a level of noise to the classroom which is conducive to achieving academic excellence.Operation of the device is simple. The teacher places it any place in the classroom that may be desired and turns it on. The device is then in a monitoring mode. The teacher sets an adjustable gain control and predetermines a level of noise which will be unacceptable. The device monitors the classroom without further intervention of the teacher.