Air horn siren

[HeX0R]

Hello friends

I wanted to ask how it's possible to create a similar siren is this of the police
But i need only the imitation of the air horn.
Like this:
**broken link removed**

 

[kchriste]

A 555 as a square wave generator feeding a speaker though a smallish capacitor would sound similar. The capacitor needs to be small enough to create a differentiator with the speaker load.

 

[HeX0R]

hmmm
thank you.
can you help me with the circuit?

 

[kchriste]

You may have to adjust the circuit to get the right pitch, but try this:

 

[blueroomelectronics]

Still trying to build your phony police car?

 

[HeX0R]

kchriste thank you!!!
i will try it.
blueroomelectronics yes
i already made a blinking light...

 

[Hero999]

If you're talking about modifying a real car to look like a police car then don't do it, it is a bad idea and is illegal, don't do it!

If it's a toy car, then I don't see a problem.

However, going by your posting history, I take it that it's a real car.

 

[audioguru]

But the "air horn" sounds like a little toy car.
It makes a quiet little squeak instead of a loud low-pitched blast.

 

[blueroomelectronics]

The "air horn" and the LED lights might work on Lilliput.

 

[ParkingLotLust]

If you're talking about modifying a real car to look like a police car then don't do it, it is a bad idea and is illegal, don't do it!

Technically, it doesnt become illegal until you act like a police officer. You can dress up your car to imitate a police car, but if you turn on the lights & siren, or try to pull someone over, thats when it becomes technically illegal. Its a huge gray area.

There was some news story where a guy converted his Mustang (I think) to look like a police car from the movie Transformers, and it was allowed, as long as he didnt act like a police officer.

 

[Hero999]

The law varies from country to country and even state to state. What you're saying might be perfectly true where you live but might not be the case abroad.