Listing ID #964108
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Contact SupplierMusical Entrance Alarm has a musical light operated burglar alarm. The circuit generates musical tone when light falls on LDR gets interrupted. This can be used to detect an unknown person when he tries to open the door. Working of the circuit is based on LDR and musical tone generator IC APM993D (IC1). LDR triggers IC 993D when light falls on it gets interrupted by a person. IC 993D is a programmed 1024 note ROM memory, which generates 16 musical tunes. It has inbuilt oscillator as well as preamplifier circuit.
About the circuit :