Abstract: In this paper the circuit in which the light activated by sound turns ON for a short duration When any external sound is heard like claps, dog sound etc. Which gives a feel that occupants have been alerted. The monitoring is done by the microphone which is fitted in a place and generates AC signals, that passes through DC blocking capacitor C1 to the base of transistor BC 549(T1). Along with the transistor T2 that amplifies the sound signals and provides current pulses from the collector of T2. When sound amplifies the sound signals and provides current pulses from the collector of T2. When sound is produced near the condenser mic, tiac1 (BT136) fires, activates, lights and the bulb(B1) glows for about two minutes. Fix the unit lose to the sound monitoring spot, with the lamp inside or outside as desired. This also can be used in some restaurants, hotels, and some kids corners are also for the domestic purposes. Connect the microphone to the sound activated lights circuit using a short length of shielded wire. Close the microphone inside a tube to increase its sensitivity.
Keywords: sound sensor, three state.
Title: SOUND HEARD DIMMING LIGHT CIRCUIT WITH THREE STATES USED FOR DOMESTIC ALERTS, ROOFINGS IN HOTELS, KIDS CORNER
Author: S.Jeneeth Subashini, S.Manoj Kumar, S.Karthick , S.Jayandran
International Journal of Electrical and Electronics Research,
ISSN 2348-6988 (online)
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