The sound of a siren by using 555 timer IC.

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KOJAK SIREN

KOJAK SIREN is the circuit that produces a sound similar to police vehicle , Ambulance vehicle , and Emergency vehicle.
This circuit is built with two 555 timer ICs and has two linear potentiometers that allow the control of sound speed and tone.
The sound of a siren by using 555 timer IC.

This circuit is designed to operate under all conditions, due the problem of getting quality sound in police vehicle , Ambulance vehicle , and Emergency vehicle., so it has been decided to use 6volts as the power source of the circuit.


It is also meet the requirements of the output voltage of the speaker and the timer to work perfect.
The sound of a siren by using 555 timer IC.

VOLTAGE SUPPLY

From
P=V2/R
0.6W=V2/55Ω
V cc=6V
Speaker 8 ohms in series with 47 ohms
So 
I=V/R
I=6V/(8+47)Ω
I=0.109A

TO OBTAIN THE VALUE OF P2,R2,R3, AND C2

P2,R2,R3 and C2 determine the frequency and time of tone.

T=Thigh-T low
T high= 0.69(RA+RB)C2
But RA=P2+R2
        RB=R3
T high= 0.69(220k+3.3k+56k)4.7n
T high= 9.058*10-4
T low= 0.69(RB)
T low= 0.69(56k)= 1.82*10 -4
T=T high + T low
T=9.058*10-4 +1.82*10-4
T=1.087*1O-3s
f= 1/T
f= 1/1.087ms
f= 919.62Hz
f= 920Hz
T= 0.69(P2+R2+2R3)C2
1.087ms=0.69(220k+3.3k+2R3)4.7nF
R3=55,691.7Ω
R3=56KΩ
P2
T=0.69(P2+3.3k+112k)4.7nF
1.087ms=0.69(P2+3.3K+112K)4.7nF
P2= 219,883.4
P2= 22Ok
R2
T= 0.69(220k+R2+112k)4.7nF
1.087mS= 0.69(220k+R2+112k)4.7nF
R2=3.3k  
C2
T=0.69(220k+3.3k+112k)C2
1.087ms=0.69(220k+3.3k+112k)C2
C2=4.7nF
P1,R1 and C1 determine the frequency and time of speed.
T=1.1*R*C
T=1.1*(P1+R1)C1
T=1.1*(47k+1k)220uF
T=11.616s
SO   f=1/T
f= 1/11.616
f= 0.086Hz
This project has successfully taken an initial idea of creating a system that help the  police vehicle , Ambulance vehicle , and Emergency vehicle. to reach  the destination at a time.

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