555 timer project, police siren using 555 timer, 555 timer police siren, applications of 555 timer, Police siren circuit in Proteus, Proteus circuit of 555 timer project. Departments:Electronics EngineeringMechatronics EngineeringComponents:555 TimerLEDsResistorSoftwares:ProteusHey Geeks! Welcome to The Engineering Projects. We hope you are having a reproductive day. We know that sirens are the special sounds that are the symbol that something unusual is occurring or ...