Simple Siren Circuit

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Simple Led Flip Flop

I was buy some circuits PCB not only LED circuits but also Siren Circuits. Siren is like alarm which scream tone. In my country, siren often use in firefighter car otherwise launch time alarm for worker in the industrial factory . This is PCB that I was buy.

After open plastic package, I got this pieces of paper and PCB of course .

And It was i assemble like this

After that i use Push Button Switch according schematic paper. Push Button Switch use to start and stop siren buzzing. When position start ( Push Button Pushed ), The Siren sound is longer then higher tone. When position stop ( Push Button Release), The Siren sound is longer then lower tone until silent. This is it.

You can look this picture to overall wiring, I use 8 Ohm, 0.5 Watt mini speaker 2.5 Inch. On the schematic paper describe that circuits work at 6 Volt. But i prefer to use 9 Volt Battery.

And you can watch this Video. This circuits is simple to make and soldering.