• Construction And Design Of Police Siren

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    • THIS STUDY IS BASED ON CONSTRUCTION AND DESIGN OF POLICE SIREN
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    • CHAPTER ONE - [ Total Page(s): 2 ]Pneumatic Siren consists of a rotating disk with holes in it such that the material between the holes interrupts a flow of air from fixed holes on the outside of the unit. As the holes in the rotating disk alternately prevent and allow air to flow it results on alternating compressed and rarefied air pressure i.e. sound. It consumes large amount of energy. Electronic Siren incorporate circuits such as oscillators, modulators and amplifiers it synthesize a selected tone which is pla ... Continue reading---