Design and Development of Noise Meter and Automatic Alarm for Sound Intensity Level

Noise management is important in the library. The development of a noise meter and automatic alarm for sound intensity level provides information on the issue of noise in the library. The study determined the personal characteristics of students in terms of their languages and noise produced during library activities, and noise reduction inside and outside of the building. The method utilized in this research includes the following: innovation of electronic circuitry, assembly of different electronic parts, and testing of different stages of the gadgets. The circuit was intended to signal, through a flashing LED of a green, yellow, and red light for the existence of sensitivity in the room where the noise was present, quieter noise flashed at the green light, louder noise flash at the yellow light and the loudest noise flashed at the red light. The noise meter was a simple device with audio-frequency sensing capabilities controlled essentially by a condenser microphone in detecting sounds and regulating audio signals by the comparator circuit to produce a signal voltage for the display and trigger the buzzer top alarm. Based on the discussion of findings, the innovated noise meter is very effective in controlling unacceptable sound level and maintaining silence inside the library