Loud speaker driver.

[priestnot]

Hello I have to drive a speaker / piezo to play a siren tone as laud as possible.
But I am running into some problems.

The first one is that I have a piezo and for it to be lowder I have to apply to it a square wave with at least 24Vpp.

The thing is I am making the square wave using a NE555 and I have a power source of 12Vdc.

Is there a cheap way to make the square wave to be generated with -12V to 12V or 0 to 24V?

 

[abhi_tandon80]

i think making sq wave with NE555 is the cheapest and best solution

 

[priestnot]

i think making sq wave with NE555 is the cheapest and best solution

Yes but how can I get the -12 and 12 or 0 24V from it?

 

[E-design]

You can run your circuit from 24V and use a regulator for the 555. On the output, you can have a driver stage to give you output swing between 0-24V. The circuit below shows the general idea.

 

[priestnot]

You can run your circuit from 24V and use a regulator for the 555. On the output, you can have a driver stage to give you output swing between 0-24V. The circuit below shows the general idea.

The circuit must run with a 12V source. Its a requisite.

 

[E-design]

Ok, then you can do something like this below. You connect the transducer (between VF3/4) so that both ends can swing between 0 and 12V but 180° out of phase. Instead of keeping one end tied to 0V, both ends can swing, thus effectively giving a delta swing of ≈24V.

 

[priestnot]

Ok, then you can do something like this below. You connect the transducer (between VF3/4) so that both ends can swing between 0 and 12V but 180° out of phase. Instead of keeping one end tied to 0V, both ends can swing, thus effectively giving a delta swing of ≈24V.

I cannot see any circuit...

 

[E-design]

It is there, so don't know why you can't view it.

 

[priestnot]

Thank you for all the input...
After a more extensive search I found this two solutions:

Voltage doubler:
https://www.youtube.com/watch?v=I4ED_8cuVTU

Voltage inverter:
https://www.youtube.com/watch?v=LtoPHevexTM

I tested the voltage doubler and it works today (hopefully) I will test it with the speaker and see if it works.

Thanks again for all the inputs.