CONSTRUCTION OF A LIGHT SENSITIVE ALARM
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ABSTRACT
This write up is concerned with the construction of a light sensitive alarm. The light sensitive alarm is an electronic device that detects a sudden shadow falling on the light sensor and sounds the bleeper when. The light sensitive alarm helps to produce a kind of sounds used in industries, hospital ambulance, and police car and so on. The circuit is built around q 7555 low-timer IC (Integrated Circuit) to generate the required alarm signal. The current from the light sensitive materials switches on a transistor amplifier.
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