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The simple Police Siren circuit uses two 555's to produce an up-down wailing sound. The first 555 is wired as a low-frequency oscillator to control the VOLTAGE CONTROL pin 5 of the second 555. The voltage shift on pin 5 causes the frequency of the second oscillator to rise and fall. Simple Police Siren Circuit Diagram

TOUCH SENSITIVE POLICE SIREN CIRCUIT Here we are going to discuss about Touch sensitive siren Circuit. I hope you enjoyed my previous post about RF REMOTE CONTROL AND SWITCHING CIRCUIT. As the Name of this circuit indicates, it is sensitive to our touch. The circuit will generate a siren, similar to police siren, when someone touch across the end terminals A and B. The circuit keeps ALARM as long as the touch. Read More.....