The circuit was designed to create an electronic siren to provide a scheme for producing an alert sound in emergency cases or any circumstances that requires its usage. The circuit was designed to ...

A spokesman for the Hawaii Emergency Management Agency said a malfunctioning emergency warning siren that sounded in error Saturday night was caused by an amplifier ...

The 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 ...

In Greek mythology, a siren was a demonic being (half bird, half woman). Later on this idea was transformed in art into a mermaid: a combination of a fish and a woman. Mechanical and electromechanical ...