DESIGN AND CONSTRUCTION OF AN ELECTRONIC SIREN
ABSTRACT
Acoustic warning devices have been used to provide warning and alerting in emergency situations for ages. Beating on various metal objects was used in ancient times. Later bell towers were built for this purpose and at the beginning of the 20th century mechanical rotating sirens started to appear. These are basically formed by an electric motor with a specially treated head that emits a sound while rotating. Those sirens are still used in many countries. The development of electronics, however, has also influenced this area and first electronic sirens started to appear at the end of the 20th century. Electronic sirens are basically high-performance electronic amplifiers just like those in home sound systems. However, these sirens work with substantially higher outputs and specific demands are placed on them in terms of desired extreme reliability and different methods of their control. Control infrastructure must also be reliable and usually two independent control channels are required. The loudspeakers for these amplifiers are placed in a specially-designed sound baffles (horns) and they play the signals stored in the siren’s digital memory or signals fed to the siren from external sources – a microphone, phone, radio station, common radio and television broadcasting.
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