Railway Level Crossing Gate Siren

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Rs. 1,200.00
Ex Tax: Rs. 1,200.00
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  • Brand: Orion iTech Solutions
    Product Code: SB01/EC112

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    This project produces a sound when any train arrives. The circuit is build with the help of two NE555 timer IC (i.e. IC1 and IC2) which are the basic block of this circuit. Both the timer IC’s in this circuit are connected like an astable multi vibrator.

     Although both the IC’s in the circuit work at two dissimilar frequencies. IC1 is an astable multi vibrator of slow frequency work on frequency of 20HZ and having 50% of duty cycle while IC2 is a fast astable multi vibrator works on frequency of 600Hz. 
    IC1 output is then served to IC2 at the control pin (oin5). Through the help of this arrangement IC2 output frequency will be modulated with the IC1output frequency. The circuit works on the DC supply between 6V to 15V.

    The frequency range of the siren can vary with the exchange of R2 and R4 resistor with potentiometer. The pitch of sound can be enlarged with the attachment of the power amplifier at the output point. The accurate effect of siren can be produced by connecting flashing LEDs with the current circuit.

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    Q1. What is the role of 555 timer IC in this project?
    Ans1. 555 timer IC is used to provide efficient delay to the siren, here 555 timer IC is used in astable mode for generating pulse/ frequency of low and high value.
    Q2. Why have we used two 555 timer IC in this project?
    Ans2. We have used two 555 timer IC here,  IC1 is astable multi vibrator of slow frequency work on frequency of 20HZ and having 50% of duty cycle while IC2 is a fast astable multi vibrator works on frequency of 600Hz. IC1 output is then serve to IC2 at the control pin for efficient time delay.
    Q3. Where can we use this project?
    Ans3. We can use this project in controlling railway crossing gates siren, in police siren, in ambulance siren etc.
    Q4. What is the role of transistor in this project?
    Ans4. Transistor is used as a switching device for turning buzzer on according to output pulse of 555 timer IC.
    Q5. What is mean by astable mode of 555 timer IC?
    Ans5. It is known as in astable mode because it has two quasi steady state which rapidly alters from one to another and again to the same state. So it mainly alters from high to low and from low to high devoid of any input trigger input after pre settled time.