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LDR and 555 timer based light activated police siren
You can make a simple light activated police siren using 2 NE555 timers and light dependent resistor. Both timers are configured in astable mode and connected to each other. The timing of both timers make police siren. A simple LDR based light sensor is connected to the circuit to make it light activated police siren. You can get all the schematics and operating videos on buildcircuit.com
Created on May 16, 2012, 15:39