Police Siren, Ambulance Siren and Fire engine Siren by UM3561 (Part 1 of 2)

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Sirens are essential in our daily life to give warnings and signals. We have heard many sirens like police siren, ambulance siren, fire engine siren etc. Generation of these sirens were very difficult in early days. Bu today, due to the development of electronics, it is very simple to generate such sirens. UM3561 is a simple IC which helps us to generate four sirens easily. They are police siren, ambulance siren, fire engine siren and machine gun sound. Output will be obtained through the speaker (I am using a 3 W, 4 Ohm speaker).

Pin out diagram of UM3561 is given below. There are two select pins in the IC. SEL1 and SEL2 which helps us to choose the desired siren.
555

Circuit

Circuit is done as shown in the following diagram. Three switches are given in the circuit to choose the desired siren. 2SC9013 is an amplifier which amplifies the signals coming from UM3561.

4000-4000-another-copy (3rd copy)

Pin out diagram of 2SC9013

Screenshot from 2015-07-09 12:29:54

Continued in next part (part 2) >>>>

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paulpp644
A deep electronic enthusiast who spent most of my time for electronic experiments. I am also interested in publishing my experiments in my blog for helping other electronics enthusiasts.