Many a person will might excited with siren sound the all that ever hear. Because we will hear when there is an accident emergency event. But ever suspect that how is those sound can happen ?
The work of the circuit IC1 which build be astable multi vibrator circuit. Will signal frequency low origin comes out the way pin 3 have about 1 Hz by frequency value that s were fixed by the value , R1, R2, C1 signal the frequency will have that to come out pin 3 ways which built get along well with 5 of IC2 change R5 . By the frequency from IC1 will touch total up with the frequency at IC2 establish will valuable about 440 Hz – 550 Hz the frequency had that to sent come out pin 3 ways. Which be take gush up of IC2 the connection goes to get along well with B of Q1 for enlarge the trend comes to sing bail make the sound of the circuit that comes out resemble the sound of police siren
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